1
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Hayashi M, Burtoloso ACB. Synthesis of gem-Difluorinated Keto-Sulfoxides from Sulfoxonium Ylides. Chemistry 2024; 30:e202400108. [PMID: 38318729 DOI: 10.1002/chem.202400108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 02/05/2024] [Accepted: 02/06/2024] [Indexed: 02/07/2024]
Abstract
Organic molecules containing fluorine and sulfur atoms represent a large percentage of approved pharmaceuticals. Those with combination of both S and F atoms in their structure such as Xtandi, approved in 2012 for prostate cancer, indicates the importance of synthetic methods that accommodates both atoms in an organic moiety. In this study, a novel aspect of sulfoxonium ylide reactivity was explored, unveiling a streamlined and mild synthesis method for gem-difluorinated keto-sulfoxides. Our protocol offers a direct and practical approach to prepare these compounds in 14-80 % chemical yields, that were represented by 21 examples. NMR studies and Hammett correlations gave strong evidence about the mechanism of this transformation.
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Affiliation(s)
- Marcio Hayashi
- Department of Physical Chemistry, São Carlos Institute of Chemistry, University of São Paulo CEP, SP-13563-120, São Carlos, Brazil
| | - Antonio C B Burtoloso
- Department of Physical Chemistry, São Carlos Institute of Chemistry, University of São Paulo CEP, SP-13563-120, São Carlos, Brazil
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2
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Camara VS, da Silva AL, da Luz LC, Rodembusch FS, Santiago PHO, Ellena J, Burtoloso ACB. Unveiling a Strategy for Ring Opening of Epoxides: Synthesis of 2-Hydroxyindolinylidenes Using α-Ester Sulfoxonium Ylides. Org Lett 2024; 26:1034-1039. [PMID: 38286095 DOI: 10.1021/acs.orglett.3c04169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2024]
Abstract
The untapped potential of α-carbonyl sulfoxonium ylides in epoxide ring-opening reactions has been a notable gap in current research, with such reactivity predominantly associated with the highly reactive dimethylsulfoxonium methylide. This study introduces an innovative approach wherein an epoxide indole, formed in situ from 2-hydroxyindoline-3-triethylammonium bromide, undergoes reaction with α-ester sulfoxonium ylides. The outcome is the efficient synthesis of a range of 2-hydroxyindolin-3-ylidenes, demonstrating favorable yields (41-81%) and Z/E ratios from 4:1 to those of exclusive Z isomers. Additionally, the photophysical properties of the synthesized indolinylidenes are explored, along with their derivatization using various nucleophiles under acid catalysis.
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Affiliation(s)
- Viktor S Camara
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos, SP 13560-970, Brazil
| | - Aislan L da Silva
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos, SP 13560-970, Brazil
| | - Lilian C da Luz
- Instituto de Química, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501-970, Brazil
| | - Fabiano S Rodembusch
- Instituto de Química, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501-970, Brazil
| | - Pedro H O Santiago
- São Carlos Institute of Physics, University of São Paulo, São Carlos, SP 13560-970, Brazil
| | - Javier Ellena
- São Carlos Institute of Physics, University of São Paulo, São Carlos, SP 13560-970, Brazil
| | - Antonio C B Burtoloso
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos, SP 13560-970, Brazil
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3
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Libardi SH, Ahmad A, Ferreira FB, Oliveira RJ, Caruso ÍP, Melo FA, de Albuquerque S, Cardoso DR, Burtoloso ACB, Borges JC. Interaction between diterpene icetexanes and old yellow enzymes of Leishmania braziliensis and Trypanosoma cruzi. Int J Biol Macromol 2024; 259:129192. [PMID: 38216013 DOI: 10.1016/j.ijbiomac.2023.129192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Revised: 12/21/2023] [Accepted: 12/31/2023] [Indexed: 01/14/2024]
Abstract
Old Yellow Enzymes (OYEs) are flavin-dependent redox enzymes that promote the asymmetric reduction of activated alkenes. Due to the high importance of flavoenzymes in the metabolism of organisms, the interaction between OYEs from the parasites Trypanosoma cruzi and Leishmania braziliensis and three diterpene icetexanes (brussonol and two analogs), were evaluated in the present study, and differences in the binding mechanism and inhibition capacity of these molecules were examined. Although the aforementioned compounds showed poor and negligible activities against T. cruzi and L. braziliensis cells, respectively, the experiments with the purified enzymes indicated that the interaction occurs by divergent mechanisms. Overall, the ligands' inhibitory effect depends on their accessibility to the N5 position of the flavin's isoalloxazine ring. The results also indicated that the OYEs found in both parasites share structural similarities and showed affinities for the diterpene icetexanes in the same range. Nevertheless, the interaction between OYEs and ligands is directed by enthalpy and/or entropy in distinct ways. In conclusion, the binding site of both OYEs exhibits remarkable plasticity, and a large range of different molecules, including that can be substrates and inhibitors, can bind this site. This plasticity should be considered in drug design using OYE as a target.
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Affiliation(s)
- Silvia H Libardi
- Instituto de Química de São Carlos, Universidade de São Paulo - USP, 13560-970 São Carlos, SP, Brazil
| | - Anees Ahmad
- Instituto de Química de São Carlos, Universidade de São Paulo - USP, 13560-970 São Carlos, SP, Brazil
| | | | - Ronaldo J Oliveira
- Instituto de Ciências Exatas, Naturais e Educação, Universidade Federal do Triângulo Mineiro, 38064-200 Uberaba, MG, Brazil
| | - Ícaro P Caruso
- Instituto de Biociências, Letras e Ciências Exatas (IBILCE) - UNESP, 15054-000 São José do Rio Preto, SP, Brazil; Instituto de Bioquímica Médica Leopoldo de Meis and Centro Nacional para Biologia Estrutural e Bioimagem, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, Brazil
| | - Fernando A Melo
- Instituto de Biociências, Letras e Ciências Exatas (IBILCE) - UNESP, 15054-000 São José do Rio Preto, SP, Brazil
| | - Sergio de Albuquerque
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo - USP, Ribeirão Preto, SP CEP 14040-903, Brazil
| | - Daniel R Cardoso
- Instituto de Química de São Carlos, Universidade de São Paulo - USP, 13560-970 São Carlos, SP, Brazil
| | - Antonio C B Burtoloso
- Instituto de Química de São Carlos, Universidade de São Paulo - USP, 13560-970 São Carlos, SP, Brazil
| | - Júlio C Borges
- Instituto de Química de São Carlos, Universidade de São Paulo - USP, 13560-970 São Carlos, SP, Brazil.
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4
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Mora Vargas JA, Burtoloso ACB. CO 2 -Based Carbamate Synthesis Utilizing Reusable Polymer-Supported DBU. ChemSusChem 2023:e202300936. [PMID: 37584441 DOI: 10.1002/cssc.202300936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 08/08/2023] [Accepted: 08/15/2023] [Indexed: 08/17/2023]
Abstract
The present study highlights a novel and advantageous protocol for accessing carbamates through the well-established three-component coupling reaction involving CO2 , amines, and alkyl halides. By employing an immobilized organic base, operating under mild reaction conditions, an array of alkyl carbamates in yields of up to 95 % could be isolated. This approach offers a broad and versatile product scope, allowing for the facile modification of both the amine and alkyl halide reactants. Notably, the pioneering use of an immobilized organic base, specifically the polymer-supported 1,8-diazabicyclo[5.4.0]undec-7-ene (PS-DBU), in this three-component reaction eliminates the need for classical purification steps, streamlining the process. To ensure practicality and sustainability, extensive studies were conducted to verify the recovery and reusability of the polymer-supported DBU catalyst, which consistently maintained the high chemical yield of the carbamates across multiple cycles. Overall, this innovative protocol represents a significant advancement in carbamate synthesis, combining efficiency, generality, and the potential for DBU recycling.
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Affiliation(s)
- Jorge Andrés Mora Vargas
- Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, São Paulo, CEP, 13560-970, Brazil
| | - Antonio C B Burtoloso
- Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, São Paulo, CEP, 13560-970, Brazil
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5
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Hayashi M, Burtoloso ACB. Organocatalytic Transformations from Sulfur Ylides. Catalysts 2023. [DOI: 10.3390/catal13040689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023] Open
Abstract
Sulfur ylides are an important class of organic compounds due to their ability to perform many different transformations that can give diverse and interesting products with a high degree of complexity. Although metal-catalyzed transformations are frequent in this class of compounds, organocatalyzed transformations remain scarce. From initial works, this review aims to show organocatalyzed transformations from sulfur ylides, involving cyclopropanation and formal N–H, S–H, and C–H insertion reactions, including enantioselective versions. The proposed mechanisms and the modes of activation of these organocatalysts will be covered. Furthermore, advances in this area and potential challenges to be circumvented in the near future will also be discussed.
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Affiliation(s)
- Marcio Hayashi
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos 13563-120, Brazil
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6
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Abstract
A novel visible-light-promoted coupling of diazoketones with sulfoxonium ylides, employing a violet light-emitting diode, is described under both batch and continuous flow conditions. This transformation permits the direct synthesis of synthetically useful 1,3-dicarbonyl sulfoxonium ylides (33 examples, 21-85% yields), by means of an acylation from the in situ and selective generation of ketenes. The reaction performed under flow conditions proved to be very efficient, providing the 1,3-dicarbonyl sulfoxonium ylides with higher yields and shorter reaction times.
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Affiliation(s)
- Radell Echemendía
- Institute of Chemistry of São Carlos, University of São Paulo, CEP, 13560-970 São Carlos, SP, Brazil
| | - Kleber T de Oliveira
- Department of Chemistry, Federal University of São Carlos, Campus São Carlos, 13565-905 São Carlos, SP, Brazil
| | - Antonio C B Burtoloso
- Institute of Chemistry of São Carlos, University of São Paulo, CEP, 13560-970 São Carlos, SP, Brazil
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7
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Momo PB, Mizobuchi EF, Echemendía R, Baddeley I, Grayson MN, Burtoloso ACB. Organocatalytic Enantioselective Sulfa-Michael Additions to α,β-Unsaturated Diazoketones. J Org Chem 2022; 87:3482-3490. [PMID: 35179890 DOI: 10.1021/acs.joc.1c03045] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Enantioselective sulfa-Michael additions to α,β unsaturated diazocarbonyl compounds have been developed. Quinine-derived squaramide was found to be the best catalyst to promote C-S bond formation in a highly stereoselective fashion for alkyl and aryl thiols. The easy-to-follow protocol allowed the preparation of 22 examples in enantiomeric ratios up to 97:3 and reaction yields up to 94%. The mechanism and origins of enantioselectivity were determined through density functional theory (DFT) calculations.
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Affiliation(s)
- Patricia B Momo
- Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, São Paulo CEP 13560-970, Brazil
| | - Eduardo F Mizobuchi
- Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, São Paulo CEP 13560-970, Brazil
| | - Radell Echemendía
- Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, São Paulo CEP 13560-970, Brazil
| | - Isabel Baddeley
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Matthew N Grayson
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Antonio C B Burtoloso
- Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, São Paulo CEP 13560-970, Brazil
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8
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Abstract
Sulfoxonium ylides are important surrogates for diazo compounds, and their use in industry as safer alternatives has been evaluated during recent years. Beyond the known classical transformations, these ylides have also been used in a surprising plethora of novel and intrinsic chemical reactions, especially in recent years. Bench stability and handling are also an advantage of this class of organosulfur molecules. Despite this, efficient asymmetric transformations, specifically catalytic enantioselective versions, have only recently been reported, and there are specific reasons for this. This perspective article covers this topic from the first studies up to the latest advances, giving personal perspectives and showing the main challenges in this area in the coming years.
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Affiliation(s)
- Clarice A D Caiuby
- São Carlos Institute of Chemistry, University of São Paulo São Carlos SP CEP 13560-970 Brazil
| | - Lucas G Furniel
- São Carlos Institute of Chemistry, University of São Paulo São Carlos SP CEP 13560-970 Brazil
| | - Antonio C B Burtoloso
- São Carlos Institute of Chemistry, University of São Paulo São Carlos SP CEP 13560-970 Brazil
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9
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Abstract
The first example of organocatalytic enantioselective C-H insertion reactions of indoles and sulfoxonium ylides is reported. Under the influence of phosphoric acid catalysis, levels of enantiocontrol in the range of 20-93% ee and moderate yields (up to 50%) were achieved for 29 examples in formal C-H insertion reactions of free indoles and α-carbonyl sulfoxonium ylides. No nitrogen protection on the indole is necessary.
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Affiliation(s)
- Alexandria N Leveille
- Department Chemistry and Biochemistry, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts 01609, United States
| | - Radell Echemendía
- Institute of Chemistry of São Carlos, University of São Paulo, CEP 13560-970 São Carlos, São Paulo, Brazil
| | - Anita E Mattson
- Department Chemistry and Biochemistry, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts 01609, United States
| | - Antonio C B Burtoloso
- Institute of Chemistry of São Carlos, University of São Paulo, CEP 13560-970 São Carlos, São Paulo, Brazil
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10
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Furniel LG, Echemendía R, Burtoloso ACB. Cooperative copper-squaramide catalysis for the enantioselective N-H insertion reaction with sulfoxonium ylides. Chem Sci 2021; 12:7453-7459. [PMID: 34163835 PMCID: PMC8171336 DOI: 10.1039/d1sc00979f] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 04/24/2021] [Indexed: 12/14/2022] Open
Abstract
The first examples of a highly efficient and enantioselective carbene-mediated insertion reaction, from a sulfur ylide, are described. By way of a catalytic asymmetric insertion reaction into N-H bonds from carbonyl sulfoxonium ylides and anilines, using a copper-bifunctional squaramide cooperative catalysis approach, thirty-seven α-arylglycine esters were synthesized in enantiomeric ratios up to 92 : 8 (99 : 1 after a single recrystallization) and reaction yields ranging between 49-96%. Furthermore, the protocol benefits from quick reaction times and is conducted in a straightforward manner.
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Affiliation(s)
- Lucas G Furniel
- São Carlos Institute of Chemistry, University of São Paulo São Carlos SP CEP 13560-970 Brazil
| | - Radell Echemendía
- São Carlos Institute of Chemistry, University of São Paulo São Carlos SP CEP 13560-970 Brazil
| | - Antonio C B Burtoloso
- São Carlos Institute of Chemistry, University of São Paulo São Carlos SP CEP 13560-970 Brazil
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11
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Day DP, Vargas JAM, Burtoloso ACB. Synthetic Routes Towards the Synthesis of Geminal α-Difunctionalized Ketones. CHEM REC 2021; 21:2837-2854. [PMID: 33533538 DOI: 10.1002/tcr.202000176] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 01/11/2021] [Indexed: 12/25/2022]
Abstract
The importance of gem-difunctionalized ketones is represented by their broad applications across chemical boundaries over recent years. The interesting reactivities that this class of compounds possess have made them ideal building blocks to access high-value organic molecules. Furthermore, the gem-difunctionalized ketone moiety has featured in numerous bioactive molecules. For these reasons, a plethora of routes to access such significant molecules have been developed by research groups worldwide - this account looks at delineating the synthesis of gem-difunctionalized ketones from carbonyl substrates, diazo compounds, sulfur ylides and alkynyl reactants.
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Affiliation(s)
- David P Day
- Instituto de Química de São Carlos, Universidade de São Paulo, CEP 13560-970, São Carlos, SP, Brasil
| | - Jorge A M Vargas
- Instituto de Química de São Carlos, Universidade de São Paulo, CEP 13560-970, São Carlos, SP, Brasil.,Facultad de Ciencias Básicas, Universidad Santiago de Cali, Calle 5 # 62-00 Campus Pampalinda, Santiago de Cali, Colombia
| | - Antonio C B Burtoloso
- Instituto de Química de São Carlos, Universidade de São Paulo, CEP 13560-970, São Carlos, SP, Brasil
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12
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Affiliation(s)
- Jorge Andrés Mora Vargas
- Instituto de Química de São Carlos Universidade de São Paulo CEP 13560‐970 São Carlos SP Brasil
- Facultad de Ciencias Básicas Universidad Santiago de Cali Calle 5 # 62‐00, Campus Pampalinda Santiago de Cali Colombia
| | - David P. Day
- Instituto de Química de São Carlos Universidade de São Paulo CEP 13560‐970 São Carlos SP Brasil
| | - Antonio C. B. Burtoloso
- Instituto de Química de São Carlos Universidade de São Paulo CEP 13560‐970 São Carlos SP Brasil
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13
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Momo PB, Leveille AN, Farrar EHE, Grayson MN, Mattson AE, Burtoloso ACB. Enantioselective S-H Insertion Reactions of α-Carbonyl Sulfoxonium Ylides. Angew Chem Int Ed Engl 2020; 59:15554-15559. [PMID: 32352184 PMCID: PMC7606806 DOI: 10.1002/anie.202005563] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Indexed: 12/20/2022]
Abstract
The first example of enantioselective S-H insertion reactions of sulfoxonium ylides is reported. Under the influence of thiourea catalysis, excellent levels of enantiocontrol (up to 95 % ee) and yields (up to 97 %) are achieved for 31 examples in S-H insertion reactions of aryl thiols and α-carbonyl sulfoxonium ylides.
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Affiliation(s)
- Patrícia B. Momo
- Institute of Chemistry of São CarlosUniversity of São PauloCEP 13560-970São CarlosSPBrazil
| | - Alexandria N. Leveille
- Department Chemistry and BiochemistryWorcester Polytechnic Institute100 Institute RoadWorcesterMA01609USA
| | | | | | - Anita E. Mattson
- Department Chemistry and BiochemistryWorcester Polytechnic Institute100 Institute RoadWorcesterMA01609USA
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14
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Dias RMP, de Oliveira GP, Burtoloso ACB. One-pot synthesis of β-O-4 lignin models via the insertion of stable 2-diazo-1,3-dicarbonyls into O-H bonds. Org Biomol Chem 2020; 18:4815-4823. [PMID: 32539068 DOI: 10.1039/d0ob00800a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Because lignin is a macromolecule that is a sustainable source of aromatic compounds, model substrates are commonly used to increase our understanding of its complex structure. However, few methods have been described for the synthesis of these models. Herein, we describe a new route towards the synthesis of β-O-4 lignin models by intermolecular O-H insertion reactions with simple and stable diazocarbonyls. The benefits of this developed method were shorter reaction times and high yields, as well as mild and environmentally friendly conditions.
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Affiliation(s)
- Rafael Mafra P Dias
- Chemistry Institute at São Carlos, University of São Paulo (USP), CEP 13560-970, São Paulo, SP, Brazil. and Department of Chemistry, Biotechnology and Bioprocess Engineering, University of São João del Rei (UFSJ), CEP 36420-000, Brazil
| | - Gabriela P de Oliveira
- Chemistry Institute at São Carlos, University of São Paulo (USP), CEP 13560-970, São Paulo, SP, Brazil.
| | - Antonio C B Burtoloso
- Chemistry Institute at São Carlos, University of São Paulo (USP), CEP 13560-970, São Paulo, SP, Brazil.
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15
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Momo PB, Leveille AN, Farrar EHE, Grayson MN, Mattson AE, Burtoloso ACB. Enantioselective S−H Insertion Reactions of α‐Carbonyl Sulfoxonium Ylides. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005563] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Patrícia B. Momo
- Institute of Chemistry of São Carlos University of São Paulo CEP 13560-970 São Carlos SP Brazil
| | - Alexandria N. Leveille
- Department Chemistry and Biochemistry Worcester Polytechnic Institute 100 Institute Road Worcester MA 01609 USA
| | | | - Matthew N. Grayson
- Department of Chemistry University of Bath Claverton Down Bath BA2 7AY UK
| | - Anita E. Mattson
- Department Chemistry and Biochemistry Worcester Polytechnic Institute 100 Institute Road Worcester MA 01609 USA
| | - Antonio C. B. Burtoloso
- Institute of Chemistry of São Carlos University of São Paulo CEP 13560-970 São Carlos SP Brazil
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16
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Bernardim B, Dunsmore L, Li H, Hocking B, Nuñez-Franco R, Navo CD, Jiménez-Osés G, Burtoloso ACB, Bernardes GJL. Precise Installation of Diazo-Tagged Side-Chains on Proteins to Enable In Vitro and In-Cell Site-Specific Labeling. Bioconjug Chem 2020; 31:1604-1610. [DOI: 10.1021/acs.bioconjchem.0c00232] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Barbara Bernardim
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Lavinia Dunsmore
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - He Li
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Brad Hocking
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Reyes Nuñez-Franco
- Computational Chemistry Lab, CIC bioGUNE-BRTA, Derio, Bizkaia, 48160, Spain
| | - Claudio D. Navo
- Computational Chemistry Lab, CIC bioGUNE-BRTA, Derio, Bizkaia, 48160, Spain
| | | | - Antonio C. B. Burtoloso
- Instituto de Química de São Carlos, Universidade de São Paulo, Avenida Joao Dagnone, 1100, CEP 13563-120, São Carlos, São Paolo, Brazil
| | - Gonçalo J. L. Bernardes
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Avenida Professor Egas Moniz, 1649-028, Lisboa, Portugal
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17
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Caiuby CAD, de Jesus MP, Burtoloso ACB. α-Imino Iridium Carbenes from Imidoyl Sulfoxonium Ylides: Application in the One-Step Synthesis of Indoles. J Org Chem 2020; 85:7433-7445. [DOI: 10.1021/acs.joc.0c00833] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Clarice A. D. Caiuby
- Instituto de Quı́mica de São Carlos, Universidade de São Paulo, CEP, 13560-970 São Carlos, SP, Brazil
| | - Matheus P. de Jesus
- Instituto de Quı́mica de São Carlos, Universidade de São Paulo, CEP, 13560-970 São Carlos, SP, Brazil
| | - Antonio C. B. Burtoloso
- Instituto de Quı́mica de São Carlos, Universidade de São Paulo, CEP, 13560-970 São Carlos, SP, Brazil
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18
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Gallo RDC, Momo PB, Day DP, Burtoloso ACB. Catalytic Friedel-Crafts Alkylation of Electron Rich Aromatic Derivatives with α-Aryl Diazoacetates Mediated by Brønsted Acids. Org Lett 2020; 22:2339-2343. [PMID: 32133862 DOI: 10.1021/acs.orglett.0c00540] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The catalytic protonation of aryl diazoacetates by strong Brønsted acids, followed by a Friedel-Crafts alkylation reaction with electron rich aromatic compounds, is reported. The reaction provided in a direct fashion 24 geminal diarylacetates in yields of ≤92%.
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Affiliation(s)
- Rafael D C Gallo
- Instituto de Quı́mica de São Carlos, Universidade de São Paulo, CEP, São Carlos, SP 13560-970, Brazil
| | - Patrícia B Momo
- Instituto de Quı́mica de São Carlos, Universidade de São Paulo, CEP, São Carlos, SP 13560-970, Brazil
| | - David P Day
- Instituto de Quı́mica de São Carlos, Universidade de São Paulo, CEP, São Carlos, SP 13560-970, Brazil
| | - Antonio C B Burtoloso
- Instituto de Quı́mica de São Carlos, Universidade de São Paulo, CEP, São Carlos, SP 13560-970, Brazil
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19
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Ahmad A, Burtoloso ACB. Total Synthesis of (±)-Brussonol and (±)-Komaroviquinone via a Regioselective Cross-Electrophile Coupling of Aryl Bromides and Epoxides. Org Lett 2019; 21:6079-6083. [DOI: 10.1021/acs.orglett.9b02221] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Anees Ahmad
- Instituto de Química de Sao Carlos, Universidade de Sao Paulo, CEP 13560-970, Sao Carlos, SP, Brazil
| | - Antonio C. B. Burtoloso
- Instituto de Química de Sao Carlos, Universidade de Sao Paulo, CEP 13560-970, Sao Carlos, SP, Brazil
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20
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Gallo RDC, Campovilla Jr. OC, Ahmad A, Burtoloso ACB. Synthesis of Oxazinanones: Intramolecular Cyclization of Amino Acid-Derived Diazoketones via Silica-Supported HClO4 Catalysis. Front Chem 2019; 7:62. [PMID: 30800653 PMCID: PMC6376066 DOI: 10.3389/fchem.2019.00062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 01/22/2019] [Indexed: 11/18/2022] Open
Abstract
A Brønsted acid catalyzed intramolecular cyclization of N-Cbz-protected diazoketones, derived from α-amino acids, is described. The reaction proceeds under metal-free conditions and is promoted by ecofriendly silica-supported HClO4 as the catalyst and methanol as the solvent. This transformation enables the short synthesis of various 1,3-oxazinane-2,5-diones under mild reaction conditions and in good yields (up to 90%). The set-up is very simple; by just mixing all reagents together with no work-up necessary before purification, this protocol takes a greener approach.
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21
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Santiago J, Burtoloso ACB. Synthesis of Fused Bicyclic [1,2,3]-Triazoles from γ-Amino Diazoketones. ACS Omega 2019; 4:159-168. [PMID: 31459321 PMCID: PMC6648081 DOI: 10.1021/acsomega.8b02764] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Accepted: 12/18/2018] [Indexed: 06/10/2023]
Abstract
Triazoles are an important class of N-heterocycles that are well known for their broad biological activities. In this work, we would like to demonstrate a direct synthesis of the rare fused bicyclic [1,2,3]-triazoles, employing γ-N-protected amino diazoketones as useful synthetic platforms. The strategy was based on the deprotection of a trifluoroacetamide group for the intramolecular and in situ generation of an α-diazo imine intermediate, followed by a 5-endo-dig cyclization to construct the bicyclic unit. In this fashion, the synthesis of a series of fused bicyclic [1,2,3]-triazoles could be carried out in good to excellent yields (63-95%).
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22
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Santos CS, Burtoloso ACB. Direct Synthesis of Highly Substituted Cyclopentadienes and Derivatives from the Self-Condensation of Renewable Ethyl Levulinate. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801197] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Camila S. Santos
- Chemistry Institute at São Carlos; University of São Paulo; CEP 13560-970 São Paulo SP Brazil
| | - Antonio C. B. Burtoloso
- Chemistry Institute at São Carlos; University of São Paulo; CEP 13560-970 São Paulo SP Brazil
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23
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Talero AG, Martins BS, Burtoloso ACB. Coupling of Sulfoxonium Ylides with Arynes: A Direct Synthesis of Pro-Chiral Aryl Ketosulfoxonium Ylides and Its Application in the Preparation of α-Aryl Ketones. Org Lett 2018; 20:7206-7211. [DOI: 10.1021/acs.orglett.8b03126] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alexánder Garay Talero
- Instituto de Química de São Carlos, Universidade de São Paulo, CEP 13560-970 São Carlos, SP, Brazil
| | - Bruna Simões Martins
- Instituto de Química de São Carlos, Universidade de São Paulo, CEP 13560-970 São Carlos, SP, Brazil
| | - Antonio C. B. Burtoloso
- Instituto de Química de São Carlos, Universidade de São Paulo, CEP 13560-970 São Carlos, SP, Brazil
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24
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Abstract
Insertion reactions of diazo carbonyls to azlactones in basic conditions have been performed. The developed method allows the preparation of a wide range of oxazole derivatives in yields ranging from 74 to 98%. Different substituents on both azlactone rings and diazo carbonyls do not compromise the methodology, even those containing stereogenic centers. Isotopic labeling experiments revealed the mechanism may proceed through a rare diazo carbonyl activation by an ammonium salt derivative.
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Affiliation(s)
- Amanda C de Mello
- Department of Chemistry , Federal University of Juiz de Fora , 36036-900 Juiz de Fora , MG , Brazil
| | - Patrícia B Momo
- Institute of Chemistry of São Carlos , University of São Paulo , 13560-970 São Carlos , SP , Brazil
| | - Antonio C B Burtoloso
- Institute of Chemistry of São Carlos , University of São Paulo , 13560-970 São Carlos , SP , Brazil
| | - Giovanni W Amarante
- Department of Chemistry , Federal University of Juiz de Fora , 36036-900 Juiz de Fora , MG , Brazil
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25
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Affiliation(s)
- João Victor Santiago
- Instituto de Química de São Carlos; Universidade de São Paulo; CEP 13560- 970 São Carlos, SP Brazil
| | - Antonio C. B. Burtoloso
- Instituto de Química de São Carlos; Universidade de São Paulo; CEP 13560- 970 São Carlos, SP Brazil
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26
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Metzker G, Dias RMP, Burtoloso ACB. Iron-Catalyzed Reductive Amination from Levulinic and Formic Acid Aqueous Solutions: An Approach for the Selective Production of Pyrrolidones in Biorefinery Facilities. ChemistrySelect 2018. [DOI: 10.1002/slct.201702580] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Gustavo Metzker
- Chemistry Institute at São Carlos; University of São Paulo, CEP; 13560-970 São Paulo, SP Brazil
| | - Rafael M. P. Dias
- Chemistry Institute at São Carlos; University of São Paulo, CEP; 13560-970 São Paulo, SP Brazil
| | - Antonio C. B. Burtoloso
- Chemistry Institute at São Carlos; University of São Paulo, CEP; 13560-970 São Paulo, SP Brazil
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27
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Gallo RDC, Ahmad A, Metzker G, Burtoloso ACB. α,α-Alkylation-Halogenation and Dihalogenation of Sulfoxonium Ylides. A Direct Preparation of Geminal Difunctionalized Ketones. Chemistry 2017; 23:16980-16984. [DOI: 10.1002/chem.201704609] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Indexed: 01/13/2023]
Affiliation(s)
- Rafael D. C. Gallo
- Instituto de Química de São Carlos; Universidade de São Paulo; CEP 13560-970 São Carlos SP Brasil
| | - Anees Ahmad
- Instituto de Química de São Carlos; Universidade de São Paulo; CEP 13560-970 São Carlos SP Brasil
| | - Gustavo Metzker
- Instituto de Química de São Carlos; Universidade de São Paulo; CEP 13560-970 São Carlos SP Brasil
| | - Antonio C. B. Burtoloso
- Instituto de Química de São Carlos; Universidade de São Paulo; CEP 13560-970 São Carlos SP Brasil
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28
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Burtoloso ACB, de Albuquerque S, Furber M, Gomes JC, Gonçalez C, Kenny PW, Leitão A, Montanari CA, Quilles JC, Ribeiro JFR, Rocha JR. Anti-trypanosomal activity of non-peptidic nitrile-based cysteine protease inhibitors. PLoS Negl Trop Dis 2017; 11:e0005343. [PMID: 28222138 PMCID: PMC5344518 DOI: 10.1371/journal.pntd.0005343] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 03/09/2017] [Accepted: 01/21/2017] [Indexed: 11/22/2022] Open
Abstract
The cysteine protease cruzipain is considered to be a validated target for therapeutic intervention in the treatment of Chagas disease. Anti-trypanosomal activity against the CL Brener strain of T. cruzi was observed in the 0.1 μM to 1 μM range for three nitrile-based cysteine protease inhibitors based on two scaffolds known to be associated with cathepsin K inhibition. The two compounds showing the greatest potency against the trypanosome were characterized by EC50 values (0.12 μM and 0.25 μM) that were an order of magnitude lower than the corresponding Ki values measured against cruzain, a recombinant form of cruzipain, in an enzyme inhibition assay. This implies that the anti-trypanosomal activity of these two compounds may not be explained only by the inhibition of the cruzain enzyme, thereby triggering a putative polypharmacological profile towards cysteine proteases.
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Affiliation(s)
- Antonio C. B. Burtoloso
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, São Paulo, Brasil
| | - Sérgio de Albuquerque
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil
| | | | - Juliana C. Gomes
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, São Paulo, Brasil
| | - Cristiana Gonçalez
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Peter W. Kenny
- Grupo de Estudos em Química Medicinal – NEQUIMED, Instituto de Química de São Carlos – Universidade de São Paulo, São Carlos, São Paulo, Brazil
| | - Andrei Leitão
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, São Paulo, Brasil
- Grupo de Estudos em Química Medicinal – NEQUIMED, Instituto de Química de São Carlos – Universidade de São Paulo, São Carlos, São Paulo, Brazil
| | - Carlos A. Montanari
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, São Paulo, Brasil
- Grupo de Estudos em Química Medicinal – NEQUIMED, Instituto de Química de São Carlos – Universidade de São Paulo, São Carlos, São Paulo, Brazil
| | - José Carlos Quilles
- Grupo de Estudos em Química Medicinal – NEQUIMED, Instituto de Química de São Carlos – Universidade de São Paulo, São Carlos, São Paulo, Brazil
| | - Jean F. R. Ribeiro
- Grupo de Estudos em Química Medicinal – NEQUIMED, Instituto de Química de São Carlos – Universidade de São Paulo, São Carlos, São Paulo, Brazil
| | - Josmar R. Rocha
- Grupo de Estudos em Química Medicinal – NEQUIMED, Instituto de Química de São Carlos – Universidade de São Paulo, São Carlos, São Paulo, Brazil
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29
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Kawamura MY, Talero AG, Santiago JV, Garambel-Vilca E, Rosset IG, Burtoloso ACB. Six-Step Syntheses of (-)-1-Deoxyaltronojirimycin and (+)-1-Deoxymannonojirimycin from N-Z-O-TBDPS-l-serinal. J Org Chem 2016; 81:10569-10575. [PMID: 27501028 DOI: 10.1021/acs.joc.6b01575] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Highly stereoselective six-step syntheses of (-)-1-deoxyaltronojirimycin (altro-DNJ) and (+)-1-deoxymannojirimycin (manno-DNJ) from N-Cbz-O-TBDPS-l-serinal are described. Key transformations involve a two-step preparation of a functionalized dihydropyridin-3-one as a common intermediate followed by Luche reduction and dihydroxylation (for altro-DNJ). The same sequence employing an epoxidation/epoxide opening in place of dihydroxylation furnishes manno-DNJ.
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Affiliation(s)
- Meire Y Kawamura
- Instituto de Química de São Carlos, Universidade de São Paulo , CEP 13560-970, São Carlos, SP, Brazil
| | - Alexánder G Talero
- Instituto de Química de São Carlos, Universidade de São Paulo , CEP 13560-970, São Carlos, SP, Brazil
| | - João V Santiago
- Instituto de Química de São Carlos, Universidade de São Paulo , CEP 13560-970, São Carlos, SP, Brazil
| | - Edson Garambel-Vilca
- Instituto de Química de São Carlos, Universidade de São Paulo , CEP 13560-970, São Carlos, SP, Brazil
| | - Isac G Rosset
- Instituto de Química de São Carlos, Universidade de São Paulo , CEP 13560-970, São Carlos, SP, Brazil
| | - Antonio C B Burtoloso
- Instituto de Química de São Carlos, Universidade de São Paulo , CEP 13560-970, São Carlos, SP, Brazil
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30
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Affiliation(s)
- Rafael M. P. Dias
- Instituto de Química
de São Carlos, Universidade de São Paulo, CEP 13560-970 São Carlos, SP, Brazil
| | - Antonio C. B. Burtoloso
- Instituto de Química
de São Carlos, Universidade de São Paulo, CEP 13560-970 São Carlos, SP, Brazil
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31
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Abstract
Among the different types of diazocarbonyl substrates found in the literature to date, α,β-unsaturated diazoketones have proven to be very promising as multifunctional intermediates. Possessing a diazo group, a ketone function and a double bond all together in a single molecule, these compounds constitute versatile building blocks for synthesis. For example, double bond functionalization, followed by intramolecular insertion reactions, can be a short alternative to prepare several rings or heterocyclic compounds. Although there are many efficient methods to prepare diazoketones, very few can be extended to the synthesis of the a,β-unsaturated diazoketones; this is likely responsible for their limited application in synthesis. Unfortunately, the classical methods to prepare saturated- or aryl-diazoketones (acylation of diazomethane with acyl chlorides or mixed anhydrides) are not suitable for preparing a,β-unsaturated diazoketones, since pyrazolines (dipolar cycloaddition products from the reaction between diazomethane and the double bond) are formed. Although Danheiser's two-step detrifluoroacetylative procedure (starting from a,β-unsaturated methyl ketones) is considered the best general method, it cannot be applied to the synthesis of all types of a,β-unsaturated diazoketones. For example, the synthesis of more complex unsaturated diazoketones, as well as those with epimerizable stereocenters in the γ position, was never described before. Another point is related to the geometry of the double bond, since practically all examples described thus far refer to unsaturated diazoketones with E geometry. In recent years, our research group developed two new Horner-Wadsworth-Emmons reagents (containing a diazocarbonyl function) that could be easily applied in the one-step preparation of α,β-unsaturated diazoketones from aldehydes. Not only were we able to selectively synthesize E- and Z-unsaturated diazoketones, but also to employ these useful platforms in the short synthesis of several nitrogen heterocycles such as indolizidines, quinolizidines, piperidines, and pyrrolidines. Our purpose in this Account is to introduce this class of diazoketone and provide a brief historical overview, culminating in how we developed a general methodology to prepare them. In continuation, we wish to call of the reader's attention to these important building blocks, showing how we could apply them to the synthesis of several nitrogen heterocycles, including the very short preparation of some popular alkaloids. The reader will also notice that the combination of these three important functions in the same molecule makes these compounds special as well as provides powerful platforms to access many important molecules in a direct fashion.
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Affiliation(s)
- Antonio C. B. Burtoloso
- Instituto de Química
de São Carlos, Universidade de São Paulo, CEP 13560-970 São Carlos, SP, Brazil
| | - Rafael M. P. Dias
- Instituto de Química
de São Carlos, Universidade de São Paulo, CEP 13560-970 São Carlos, SP, Brazil
| | - Barbara Bernardim
- Instituto de Química
de São Carlos, Universidade de São Paulo, CEP 13560-970 São Carlos, SP, Brazil
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32
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Metzker G, Burtoloso ACB. Conversion of levulinic acid into γ-valerolactone using Fe3(CO)12: mimicking a biorefinery setting by exploiting crude liquors from biomass acid hydrolysis. Chem Commun (Camb) 2015; 51:14199-202. [DOI: 10.1039/c5cc02993g] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The direct conversion of LA, from crude liquors after biomass acid hydrolysis, into GVL is achieved using Fe catalysts.
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Affiliation(s)
- Gustavo Metzker
- Chemistry Institute at São Carlos
- University of São Paulo
- São Carlos
- Brazil
| | - Antonio C. B. Burtoloso
- Chemistry Institute at São Carlos
- University of São Paulo
- São Carlos
- Brazil
- Brazilian Bioethanol Science and Technology Laboratory (CTBE) – CNPEM
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33
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Abstract
The Wolff rearrangement suffers from many drawbacks with respect to its practical execution in the laboratory. Herein, commercial LED lamps are employed as a sustainable alternative for the classic protocols typically used for Wolff rearrangements.
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Affiliation(s)
- Barbara Bernardim
- Instituto de Química de São Carlos
- Universidade de São Paulo
- São Carlos
- Brasil
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34
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Affiliation(s)
- Isac G. Rosset
- Instituto de Química
de São Carlos, Universidade de São Paulo, CEP 13560-970, São Carlos, SP Brazil
| | - Rafael M. P. Dias
- Instituto de Química
de São Carlos, Universidade de São Paulo, CEP 13560-970, São Carlos, SP Brazil
| | - Vagner D. Pinho
- Instituto de Química
de São Carlos, Universidade de São Paulo, CEP 13560-970, São Carlos, SP Brazil
| | - Antonio C. B. Burtoloso
- Instituto de Química
de São Carlos, Universidade de São Paulo, CEP 13560-970, São Carlos, SP Brazil
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35
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Rosset IG, Burtoloso ACB. Preparation of Z-α,β-Unsaturated Diazoketones from Aldehydes. Application in the Construction of Substituted Dihydropyridin-3-ones. J Org Chem 2013; 78:9464-70. [DOI: 10.1021/jo401191s] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Isac G. Rosset
- Instituto de Química
de São Carlos, Universidade de São Paulo, CEP 13560-970, São Carlos, SP, Brazil
| | - Antonio C. B. Burtoloso
- Instituto de Química
de São Carlos, Universidade de São Paulo, CEP 13560-970, São Carlos, SP, Brazil
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36
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Burtoloso ACB, Dias RMP, Leonarczyk IA. Sulfoxonium and Sulfonium Ylides as Diazocarbonyl Equivalents in Metal-Catalyzed Insertion Reactions (Eur. J. Org. Chem. 23/2013). European J Org Chem 2013. [DOI: 10.1002/ejoc.201390064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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37
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Burtoloso ACB, Dias RMP, Leonarczyk IA. Sulfoxonium and Sulfonium Ylides as Diazocarbonyl Equivalents in Metal-Catalyzed Insertion Reactions. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300581] [Citation(s) in RCA: 119] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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38
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Pinho VD, Procter DJ, Burtoloso ACB. SmI2-Mediated Couplings of α-Amino Acid Derivatives. Formal Synthesis of (−)-Pumiliotoxin 251D and (±)-Epiquinamide. Org Lett 2013; 15:2434-7. [DOI: 10.1021/ol400903n] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vagner D. Pinho
- Instituto de Química de São Carlos, Universidade de São Paulo, CEP 13560-970, São Carlos, SP, Brazil, and The School of Chemistry, University of Manchester, Manchester, M13 9PL, U.K
| | - David J. Procter
- Instituto de Química de São Carlos, Universidade de São Paulo, CEP 13560-970, São Carlos, SP, Brazil, and The School of Chemistry, University of Manchester, Manchester, M13 9PL, U.K
| | - Antonio C. B. Burtoloso
- Instituto de Química de São Carlos, Universidade de São Paulo, CEP 13560-970, São Carlos, SP, Brazil, and The School of Chemistry, University of Manchester, Manchester, M13 9PL, U.K
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39
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Bernardim B, Pinho VD, Burtoloso ACB. α,β-Unsaturated Diazoketones as Platforms in the Asymmetric Synthesis of Hydroxylated Alkaloids. Total Synthesis of 1-Deoxy-8,8a-diepicastanospermine and 1,6-Dideoxyepicastanospermine and Formal Synthesis of Pumiliotoxin 251D. J Org Chem 2012; 77:9926-31. [DOI: 10.1021/jo301967w] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Barbara Bernardim
- Instituto de Química de São Carlos, Universidade de São Paulo, CEP 13560-970, São
Carlos, SP, Brazil
| | - Vagner D. Pinho
- Instituto de Química de São Carlos, Universidade de São Paulo, CEP 13560-970, São
Carlos, SP, Brazil
| | - Antonio C. B. Burtoloso
- Instituto de Química de São Carlos, Universidade de São Paulo, CEP 13560-970, São
Carlos, SP, Brazil
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40
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Pinho VD, Burtoloso ACB. Correction to Preparation of α,β-Unsaturated Diazoketones Employing a Horner–Wadsworth–Emmons Reagent. J Org Chem 2011. [DOI: 10.1021/jo2014615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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41
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Affiliation(s)
- Vagner D. Pinho
- Instituto de Química de São Carlos, Universidade de São Paulo, CEP 13560-970, São Carlos, SP, Brazil
| | - Antonio C. B. Burtoloso
- Instituto de Química de São Carlos, Universidade de São Paulo, CEP 13560-970, São Carlos, SP, Brazil
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42
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Nicolaou KC, Frederick MO, Burtoloso ACB, Denton RM, Rivas F, Cole KP, Aversa RJ, Gibe R, Umezawa T, Suzuki T. Chemical Synthesis of the GHIJKLMNO Ring System of Maitotoxin. J Am Chem Soc 2008; 130:7466-76. [PMID: 18481856 DOI: 10.1021/ja801139f] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
As the largest secondary metabolite to be discovered as of yet, the polyether marine neurotoxin maitotoxin constitutes a major structural and synthetic challenge. After its originally proposed structure ( 1) had been questioned on the basis of biosynthetic considerations, we provided computational and experimental support for structure 1. In an effort to provide stronger experimental evidence of the molecular architecture of maitotoxin, its GHIJKLMNO ring system 3 was synthesized. The (13)C NMR chemical shifts of synthetic 3 matched closely those corresponding to the same domain of the natural product providing strong evidence for the correctness of the originally proposed structure of maitotoxin ( 1).
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Affiliation(s)
- K C Nicolaou
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.
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