1
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Stojalnikova V, Webster SJ, Liu K, Fletcher SP. Chelation enables selectivity control in enantioconvergent Suzuki-Miyaura cross-couplings on acyclic allylic systems. Nat Chem 2024; 16:791-799. [PMID: 38332329 PMCID: PMC11087250 DOI: 10.1038/s41557-023-01430-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Accepted: 12/18/2023] [Indexed: 02/10/2024]
Abstract
Asymmetric Suzuki-Miyaura cross-couplings with aryl boronic acids and allylic electrophiles are a powerful method to convert racemic mixtures into enantioenriched products. Currently, enantioconvergent allylic arylations are limited to substrates that are symmetrical about the allylic unit, and the absence of strategies to control regio-, E/Z- and enantioselectivity in acyclic allylic systems is a major restriction. Here, using a system capable of either conjugate addition or allylic arylation, we have discovered the structural features and experimental conditions that allow an acyclic system to undergo chemo- and regioselective, enantioconvergent allylic Suzuki-Miyaura-type arylation. A wide variety of boronic acid coupling partners can be used, and both alkyl and aromatic substituents are tolerated on the allylic unit so that a wide variety of structures can be obtained. Preliminary mechanistic studies reveal that the chelating ability of the ester group is crucial to obtaining high regio- and enantioselectivity. Using this method, we were able to synthesize the natural products (S)-curcumene and (S)-4,7-dimethyl-1-tetralone and the clinically used antidepressant sertraline (Zoloft).
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Affiliation(s)
| | - Stephen J Webster
- Chemistry Research Laboratory, University of Oxford, Oxford, United Kingdom
| | - Ke Liu
- Chemistry Research Laboratory, University of Oxford, Oxford, United Kingdom
| | - Stephen P Fletcher
- Chemistry Research Laboratory, University of Oxford, Oxford, United Kingdom.
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2
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Maji R, Ghosh S, Grossmann O, Zhang P, Leutzsch M, Tsuji N, List B. A Catalytic Asymmetric Hydrolactonization. J Am Chem Soc 2023; 145:8788-8793. [PMID: 37043821 PMCID: PMC10141295 DOI: 10.1021/jacs.3c01404] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
Despite recent advancements in the development of catalytic asymmetric electrophile induced lactonization reactions of olefinic carboxylic acids, the archetypical hydrolactonization has long remained an unsolved and well-recognized challenge. Here, we report the realization of a catalytic asymmetric hydrolactonization using a confined imidodiphosphorimidate (IDPi) Brønsted acid catalyst. The method is operationally simple, scalable, and compatible with a wide variety of substrates. Its potential is showcased with concise syntheses of the sesquiterpenes (-)-boivinianin A and (+)-gossonorol. Through in-depth physicochemical and DFT analyses, we derive a nuanced picture of the mechanism and enantioselectivity of this reaction.
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Affiliation(s)
- Rajat Maji
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Santanu Ghosh
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Oleg Grossmann
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Pinglu Zhang
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Markus Leutzsch
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Nobuya Tsuji
- Institute for Chemical Reaction Design and Discovery (WPI-ICRedd), Hokkaido University, Sapporo 001-0021, Japan
| | - Benjamin List
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
- Institute for Chemical Reaction Design and Discovery (WPI-ICRedd), Hokkaido University, Sapporo 001-0021, Japan
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3
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Bellido M, Riego-Mejías C, Diaz-Moreno A, Verdaguer X, Riera A. Enantioselective Ir-Catalyzed Hydrogenation of Terminal Homoallyl Sulfones: Total Synthesis of (-)-Curcumene. Org Lett 2023; 25:1453-1457. [PMID: 36857213 PMCID: PMC10013179 DOI: 10.1021/acs.orglett.3c00181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Indexed: 03/02/2023]
Abstract
A novel methodology for the preparation of chiral methyl benzylic compounds is reported. Terminal homoallyl sulfones were prepared from homoallyl alcohols, which are easily accessible through the recently reported Lewis acid isomerization of oxetanes. The iridium-catalyzed asymmetric hydrogenation of homoallylic sulfones afforded γ-chiral sulfones with excellent enantioselectivities (up to 98% ee). The synthetic potential of this novel methodology was demonstrated by the total synthesis of (R)-(-)-curcumene.
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Affiliation(s)
- Marina Bellido
- Institute
for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology (BIST), Baldiri Reixach 10, 08028 Barcelona, Spain
| | - Carlos Riego-Mejías
- Institute
for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology (BIST), Baldiri Reixach 10, 08028 Barcelona, Spain
| | - Alejandro Diaz-Moreno
- Institute
for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology (BIST), Baldiri Reixach 10, 08028 Barcelona, Spain
| | - Xavier Verdaguer
- Institute
for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology (BIST), Baldiri Reixach 10, 08028 Barcelona, Spain
- Departament
de Química Inorgànica i Orgànica, Secció
Química Orgànica, Universitat
de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain
| | - Antoni Riera
- Institute
for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology (BIST), Baldiri Reixach 10, 08028 Barcelona, Spain
- Departament
de Química Inorgànica i Orgànica, Secció
Química Orgànica, Universitat
de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain
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4
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Nyamwihura RJ, Ogungbe IV. The pinene scaffold: its occurrence, chemistry, synthetic utility, and pharmacological importance. RSC Adv 2022; 12:11346-11375. [PMID: 35425061 PMCID: PMC9003397 DOI: 10.1039/d2ra00423b] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 03/29/2022] [Indexed: 11/21/2022] Open
Abstract
This review provides insight into the utility of pinene in the synthetic building block and as reagent in asymmetric synthesis.
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Affiliation(s)
- Rogers J. Nyamwihura
- Department of Chemistry, Jackson State University, 1400 John R. Lynch Street, Jackson, MS 39217, USA
| | - Ifedayo Victor Ogungbe
- Department of Chemistry, Jackson State University, 1400 John R. Lynch Street, Jackson, MS 39217, USA
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5
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Shu HZ, Peng C, Bu L, Guo L, Liu F, Xiong L. Bisabolane-type sesquiterpenoids: Structural diversity and biological activity. PHYTOCHEMISTRY 2021; 192:112927. [PMID: 34492546 DOI: 10.1016/j.phytochem.2021.112927] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 08/10/2021] [Accepted: 08/16/2021] [Indexed: 06/13/2023]
Abstract
Bisabolane-type sesquiterpenoids, a class of monocyclic sesquiterpenoids, are widely distributed in nature and have a variety of biological activities. To provide a reference for the further research and development of these compounds, the phytochemical and biological properties of natural bisabolane-type sesquiterpenoids (356 compounds in total) isolated between 1985 and 2020 from 24 families, primarily Compositae, Zingiberaceae, Aspergillaceae, Halichondriidae, and Aplysiidae were reviewed. In vitro and in vivo studies have indicated that antibacterial, anti-inflammatory, and cytotoxic effects are the most commonly reported pharmacological properties of bisabolane-type sesquiterpenoids. Owing to their extensive significant effects, a lot of traditional medicines containing this type of compounds have been used for a long history. Thus, bisabolane-type sesquiterpenoids are a rich source of important natural products, which show great potential for the development of new drugs.
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Affiliation(s)
- Hong-Zhen Shu
- State Key Laboratory of Southwestern Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China; School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China; Institute of Innovative Medicine Ingredients of Southwest Specialty Medicinal Materials, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China
| | - Cheng Peng
- State Key Laboratory of Southwestern Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China; School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China
| | - Lan Bu
- State Key Laboratory of Southwestern Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China; School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China; Institute of Innovative Medicine Ingredients of Southwest Specialty Medicinal Materials, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China
| | - Li Guo
- State Key Laboratory of Southwestern Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China; School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China
| | - Fei Liu
- State Key Laboratory of Southwestern Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China; School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China; Institute of Innovative Medicine Ingredients of Southwest Specialty Medicinal Materials, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China.
| | - Liang Xiong
- State Key Laboratory of Southwestern Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China; School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China; Institute of Innovative Medicine Ingredients of Southwest Specialty Medicinal Materials, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China.
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6
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Xu WY, Zhuo KF, Gong TJ, Fu Y. Transition-Metal-Free Valorization of Biomass-derived Levulinic Acid Derivatives: Synthesis of Curcumene and Xanthorrhizol. CHEMSUSCHEM 2021; 14:884-891. [PMID: 33090706 DOI: 10.1002/cssc.202002167] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 10/04/2020] [Indexed: 06/11/2023]
Abstract
Levulinic acid (LA) is acknowledged one of the most promising biomass-derived platform molecules and can be transformed into various value-added chemicals. Here, we report a new reaction process for the valorization of LA derivatives under transition-metal-free condition. The protocol combined with the conversion of the levulinate to tosylhydrazone and base promoted arylation, acylation, and etherification cross-coupling. Moreover, our method was applied to synthesize three biologically active molecules, rac-curcumene, rac-xanthorrhizol and rac-4,7-dimethyl-l-tetralone. This reaction discloses a new avenue for the high-value utilization of platform molecules.
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Affiliation(s)
- Wen-Yan Xu
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass Clean Energy, iChEM, University of Science and Technology of China, Hefei, 230026, P. R. China
| | - Kai-Feng Zhuo
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass Clean Energy, iChEM, University of Science and Technology of China, Hefei, 230026, P. R. China
| | - Tian-Jun Gong
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass Clean Energy, iChEM, University of Science and Technology of China, Hefei, 230026, P. R. China
- Hefei Institute of Energy, Hefei, P. R. China
| | - Yao Fu
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass Clean Energy, iChEM, University of Science and Technology of China, Hefei, 230026, P. R. China
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7
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Park D, Baek D, Lee CW, Ryu H, Park S, Han W, Hong S. Enantioselective C(sp2)–H borylation of diarylmethylsilanes catalyzed by chiral pyridine-dihydroisoquinoline iridium complexes. Tetrahedron 2021. [DOI: 10.1016/j.tet.2020.131811] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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8
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Kavanagh SE, Gilheany DG. Harnessing the Power of the Asymmetric Grignard Synthesis of Tertiary Alcohols: Ligand Development and Improved Scope Exemplified by One-Step Gossonorol Synthesis. Org Lett 2020; 22:8198-8203. [PMID: 33074677 DOI: 10.1021/acs.orglett.0c02629] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of N-substituted cyclohexyldiaminophenolic ligands for the asymmetric Grignard synthesis of tertiary alcohols is reported. The 2,5-dimethylpyrrole-decorated ligand led to improved enantioselectivities and broadened the scope of the methodology. As an exemplar, we report an unprecedented highly selective one-step synthesis of gossonorol in 93% ee, also constituting the shortest formal syntheses of natural products boivinianin B and yingzhaosu C.
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Affiliation(s)
- Saranna E Kavanagh
- Centre for Synthesis and Chemical Biology, School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Declan G Gilheany
- Centre for Synthesis and Chemical Biology, School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
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9
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Monasterolo C, Müller-Bunz H, Gilheany DG. Very short highly enantioselective Grignard synthesis of 2,2-disubstituted tetrahydrofurans and tetrahydropyrans. Chem Sci 2019; 10:6531-6538. [PMID: 31341606 PMCID: PMC6611064 DOI: 10.1039/c9sc00978g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 05/25/2019] [Indexed: 12/17/2022] Open
Abstract
Phenones with elongated chains are shown to be excellent substrates for ligand-promoted asymmetric Grignard synthesis of tertiary alcohols. In turn this enables the simple, short and highly enantioselective (up to 96% ee) preparation of chiral 2,2-disubstituted THFs and THPs. Thus, asymmetric addition of Grignard reagents to γ-chlorobutyrophenones and δ-chlorovalerophenones takes place in the presence of a chiral diaminocyclohexyl-derived tridentate ligand and subsequent base-promoted intramolecular cyclisation occurs with complete retention of asymmetry. As examples of the methodology, we report the shortest syntheses of gossonorol, γ-ethyl-γ-phenylbutyrolactone and δ-methyl-δ-tolylvalerolactone, the joint-shortest and flexible synthesis of boivinianin A and the shortest formal syntheses of boivinianin B and yingzhaosu C.
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Affiliation(s)
- Claudio Monasterolo
- Centre for Synthesis and Chemical Biology , School of Chemistry , University College Dublin , Belfield , Dublin 4 , Ireland . ;
| | - Helge Müller-Bunz
- Centre for Synthesis and Chemical Biology , School of Chemistry , University College Dublin , Belfield , Dublin 4 , Ireland . ;
| | - Declan G Gilheany
- Centre for Synthesis and Chemical Biology , School of Chemistry , University College Dublin , Belfield , Dublin 4 , Ireland . ;
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10
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Krajangsri S, Wu H, Liu J, Rabten W, Singh T, Andersson PG. Tandem Peterson olefination and chemoselective asymmetric hydrogenation of β-hydroxy silanes. Chem Sci 2019; 10:3649-3653. [PMID: 30996960 PMCID: PMC6438149 DOI: 10.1039/c8sc05261a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Accepted: 02/03/2019] [Indexed: 12/27/2022] Open
Abstract
Tandem Peterson olefination and asymmetric hydrogenation of β-hydroxy silanes provides an efficient route to access the chiral benzylic hydrocarbon. The chemoselectivity can be tuned by the addition of base.
Here, we report the first Ir–N,P complex catalyzed tandem Peterson olefination and asymmetric hydrogenation of β-hydroxy silanes. This reaction resulted in the formation of chiral alkanes in high isolated yields (up to 99%) and excellent enantioselectivity (up to 99% ee) under mild conditions. Modification of the reaction conditions provides a choice to transform either an olefin or the β-hydroxy silane in a chemoselective manner. Additionally, based on this method, an expedient enantioselective synthesis of (S)-(+)-α-curcumene, from a simple ketone, was accomplished in two steps with 75% overall yield and 95% ee.
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Affiliation(s)
- Suppachai Krajangsri
- Department of Organic Chemistry , Arrhenius Laboratory , Stockholm University , 106 91 , Stockholm , Sweden .
| | - Haibo Wu
- Department of Organic Chemistry , Arrhenius Laboratory , Stockholm University , 106 91 , Stockholm , Sweden .
| | - Jianguo Liu
- Department of Organic Chemistry , Arrhenius Laboratory , Stockholm University , 106 91 , Stockholm , Sweden .
| | - Wangchuk Rabten
- Department of Organic Chemistry , Arrhenius Laboratory , Stockholm University , 106 91 , Stockholm , Sweden .
| | - Thishana Singh
- School of Chemistry and Physics , University of Kwazulu-Natal , Private Bag X54001 , Durban , 4000 , South Africa
| | - Pher G Andersson
- Department of Organic Chemistry , Arrhenius Laboratory , Stockholm University , 106 91 , Stockholm , Sweden . .,School of Chemistry and Physics , University of Kwazulu-Natal , Private Bag X54001 , Durban , 4000 , South Africa
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11
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Verma PK, Shegavi ML, Bose SK, Geetharani K. A nano-catalytic approach for C–B bond formation reactions. Org Biomol Chem 2018; 16:857-873. [DOI: 10.1039/c7ob02958f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Nanoparticle-catalysed borylation is one of the most convenient methods for the synthesis of organoboranes to overcome the confines of homogeneous catalysis such as recyclability and heavy metal contamination.
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Affiliation(s)
- Piyush Kumar Verma
- Department of Inorganic and Physical Chemistry
- Indian institute of Science
- Bangalore-560012
- India
| | - Mahadev L. Shegavi
- Centre for Nano and Material Sciences (CNMS)
- Jain University
- Bangalore-562112
- India
| | | | - K. Geetharani
- Department of Inorganic and Physical Chemistry
- Indian institute of Science
- Bangalore-560012
- India
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12
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Wen S, Chen C, Du S, Zhang Z, Huang Y, Han Z, Dong XQ, Zhang X. Highly Enantioselective Asymmetric Hydrogenation of Carboxy-Directed α,α-Disubstituted Terminal Olefins via the Ion Pair Noncovalent Interaction. Org Lett 2017; 19:6474-6477. [PMID: 29164897 DOI: 10.1021/acs.orglett.7b02972] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The t-Bu-Wudaphos was successfully applied into Rh-catalyzed asymmetric hydrogenation of α,α-disubstituted terminal olefins bearing a carboxy-directed group with excellent reactivities and enantioselectivities via the ion pair noncovalent interaction (up to >99% conversion, 98% yield, 98% ee) under mild reaction conditions without base. In addition, control experiments were conducted, and the results demonstrated that the ion pair noncovalent interaction between ligand and substrate played an important role in achieving an outstanding performance in this asymmetric hydrogenation.
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Affiliation(s)
- Songwei Wen
- Key Laboratory of Biomedical Polymers, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University , Wuhan, Hubei 430072, P. R. China
| | - Caiyou Chen
- Key Laboratory of Biomedical Polymers, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University , Wuhan, Hubei 430072, P. R. China
| | - Shuaichen Du
- Key Laboratory of Biomedical Polymers, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University , Wuhan, Hubei 430072, P. R. China
| | - Zhefan Zhang
- Key Laboratory of Biomedical Polymers, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University , Wuhan, Hubei 430072, P. R. China
| | - Yi Huang
- Key Laboratory of Biomedical Polymers, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University , Wuhan, Hubei 430072, P. R. China
| | - Zhengyu Han
- Key Laboratory of Biomedical Polymers, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University , Wuhan, Hubei 430072, P. R. China
| | - Xiu-Qin Dong
- Key Laboratory of Biomedical Polymers, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University , Wuhan, Hubei 430072, P. R. China
| | - Xumu Zhang
- Key Laboratory of Biomedical Polymers, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University , Wuhan, Hubei 430072, P. R. China.,Department of Chemistry, Southern University of Science and Technology , Shenzhen, Guangdong 518000, P. R. China
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13
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Spielmann K, de Figueiredo RM, Campagne JM. Stereospecific Hydrogenolysis of Lactones: Application to the Total Syntheses of (R)-ar-Himachalene and (R)-Curcumene. J Org Chem 2017; 82:4737-4743. [DOI: 10.1021/acs.joc.7b00419] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kim Spielmann
- Institut Charles Gerhardt,
UMR 5253 CNRS-UM-ENSCM, Ecole Nationale Supérieur de Chimie de Montpellier 8, Rue de L’Ecole Normale, F-34296 Cedex 5 Montpellier, France
| | - Renata Marcia de Figueiredo
- Institut Charles Gerhardt,
UMR 5253 CNRS-UM-ENSCM, Ecole Nationale Supérieur de Chimie de Montpellier 8, Rue de L’Ecole Normale, F-34296 Cedex 5 Montpellier, France
| | - Jean-Marc Campagne
- Institut Charles Gerhardt,
UMR 5253 CNRS-UM-ENSCM, Ecole Nationale Supérieur de Chimie de Montpellier 8, Rue de L’Ecole Normale, F-34296 Cedex 5 Montpellier, France
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14
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Sandford C, Aggarwal VK. Stereospecific functionalizations and transformations of secondary and tertiary boronic esters. Chem Commun (Camb) 2017; 53:5481-5494. [DOI: 10.1039/c7cc01254c] [Citation(s) in RCA: 342] [Impact Index Per Article: 48.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This feature article discusses the range of stereospecific transformations available to enantioenriched boronic esters, and their applications in synthesis.
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15
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Scharnagl FK, Bose SK, Marder TB. Acylboranes: synthetic strategies and applications. Org Biomol Chem 2017; 15:1738-1752. [DOI: 10.1039/c6ob02425d] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Acylboranes are an attractive class of compounds, of which the synthesis has very recently been documented as summarised in this review. Access to these compounds provides a path to study their properties and reactivity.
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Affiliation(s)
- Florian Korbinian Scharnagl
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
| | - Shubhankar Kumar Bose
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
- Centre for Nano and Material Sciences (CNMS)
| | - Todd B. Marder
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
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16
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Le Chapelain C. Strategy towards the enantioselective synthesis of schiglautone A. Org Biomol Chem 2017; 15:6242-6256. [DOI: 10.1039/c7ob00766c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The enantioselective synthesis of a functionalized intermediate comprising 6 of the 7 stereocenters of schiglautone A is reported and features a lithiation–borylation enzymatic resolution sequence.
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17
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Aursnes M, Tungen JE, Hansen TV. Enantioselective Organocatalyzed Bromolactonizations: Applications in Natural Product Synthesis. J Org Chem 2016; 81:8287-95. [PMID: 27564594 DOI: 10.1021/acs.joc.6b01375] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Asymmetric bromolactonization reactions of δ-unsaturated carboxylic acids have been investigated in the presence of 10 chiral squaramide hydrogen-bonding organocatalysts. The best catalyst enabled the cyclization of several 5-arylhex-5-enoic acids into the corresponding bromolactones with up to 96% ee and in high to excellent chemical yields. The reported catalysts are prepared in a straightforward manner in two steps from dimethyl squarate. The utility of the developed protocol was demonstrated in highly enantioselective syntheses of the sesquiterpenoids (-)-gossoronol and (-)-boivinianin B. Both natural products were obtained in ≥99% enantiomeric excess.
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Affiliation(s)
- Marius Aursnes
- Department of Pharmaceutical Chemistry, School of Pharmacy, University of Oslo , P.O. Box 1068, Blindern, N-0316 Oslo, Norway
| | - Jørn E Tungen
- Department of Pharmaceutical Chemistry, School of Pharmacy, University of Oslo , P.O. Box 1068, Blindern, N-0316 Oslo, Norway
| | - Trond V Hansen
- Department of Pharmaceutical Chemistry, School of Pharmacy, University of Oslo , P.O. Box 1068, Blindern, N-0316 Oslo, Norway
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Roesner S, Blair DJ, Aggarwal VK. Enantioselective installation of adjacent tertiary benzylic stereocentres using lithiation-borylation-protodeboronation methodology. Application to the synthesis of bifluranol and fluorohexestrol. Chem Sci 2015; 6:3718-3723. [PMID: 29218141 PMCID: PMC5707455 DOI: 10.1039/c4sc03901g] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 04/11/2015] [Indexed: 12/14/2022] Open
Abstract
1,2-Diaryl ethanes bearing 1,2-stereogenic centres show interesting biological activity but their stereocontrolled synthesis has not been reported forcing a reliance of methods involving diastereomer and enantiomer separation. We have found that this class of molecules can be prepared with very high stereocontrol using lithiation-borylation methodology. The reaction of an enantioenriched benzylic lithiated carbamate with an enantioenriched benzylic secondary pinacol boronic ester gave a tertiary boronic ester with complete diastereo- and enantiocontrol. It was essential to use MgBr2/MeOH after formation of the boronate complex, both to promote the 1,2-migration and to trap any lithiated carbamate/benzylic anion that formed from fragmentation of the ate complex, anions that would otherwise racemise and re-form the boronate complex eroding both er and dr of the product. When the benzylic lithiated carbamate and benzylic secondary pinacol boronic ester were too hindered, boronate complex did not even form. In these cases, it was found that the use of the less hindered neopentyl boronic esters enabled successful homologation to take place even for the most hindered reaction partners, with high stereocontrol and without the need for additives. Protodeboronation of the product boronic esters with TBAF gave the target 1,2-diaryl ethanes bearing 1,2-stereogenic centres. The methodology was applied to the stereocontrolled synthesis of bifluranol and fluorohexestrol in just 7 and 5 steps, respectively.
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Affiliation(s)
- Stefan Roesner
- School of Chemistry , University of Bristol , Cantock's Close , Bristol , BS8 1TS , UK . ; ; Tel: +44 (0)117 954 6315
| | - Daniel J Blair
- School of Chemistry , University of Bristol , Cantock's Close , Bristol , BS8 1TS , UK . ; ; Tel: +44 (0)117 954 6315
| | - Varinder K Aggarwal
- School of Chemistry , University of Bristol , Cantock's Close , Bristol , BS8 1TS , UK . ; ; Tel: +44 (0)117 954 6315
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Loach R, Fenton OS, Amaike K, Siegel DS, Ozkal E, Movassaghi M. C7-derivatization of C3-alkylindoles including tryptophans and tryptamines. J Org Chem 2014; 79:11254-63. [PMID: 25343326 PMCID: PMC4241164 DOI: 10.1021/jo502062z] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2014] [Indexed: 02/07/2023]
Abstract
A versatile strategy for C7-selective boronation of tryptophans, tryptamines, and 3-alkylindoles by way of a single-pot C2/C7-diboronation-C2-protodeboronation sequence is described. The combination of a mild iridium-catalyzed C2/C7-diboronation followed by an in situ palladium-catalyzed C2-protodeboronation allows efficient entry to valuable C7-boroindoles that enable further C7-derivatization. The versatility of the chemistry is highlighted by the gram-scale synthesis of C7-boronated N-Boc-L-tryptophan methyl ester and the rapid synthesis of C7-halo, C7-hydroxy, and C7-aryl tryptophan derivatives.
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Affiliation(s)
- Richard
P. Loach
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue 18-292, Cambridge, Massachusetts 02139, United States
| | - Owen S. Fenton
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue 18-292, Cambridge, Massachusetts 02139, United States
| | - Kazuma Amaike
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue 18-292, Cambridge, Massachusetts 02139, United States
| | - Dustin S. Siegel
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue 18-292, Cambridge, Massachusetts 02139, United States
| | - Erhan Ozkal
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue 18-292, Cambridge, Massachusetts 02139, United States
| | - Mohammad Movassaghi
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue 18-292, Cambridge, Massachusetts 02139, United States
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Leonori D, Aggarwal VK. Lithiation-borylation methodology and its application in synthesis. Acc Chem Res 2014; 47:3174-83. [PMID: 25262745 DOI: 10.1021/ar5002473] [Citation(s) in RCA: 276] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Developing new methods that enable the synthesis of new and complex molecules with complete control of their 3-D shape is central to the advancement of synthetic chemistry with applications spanning from medicine to materials. Our approach consists of the iterative combination of small building blocks through the use of boron chemistry to essentially "grow" molecules. This approach, which we term assembly-line synthesis (ALS), resembles the way that nature assembles natural products (e.g., the polyketide synthase machinery) and has the advantage that many structural variations can be easily introduced and the products can be evaluated in structural or biological contexts. Chiral boronic esters have been recognized as valuable building blocks due to their unique chemical properties. They are both chemically and configurationally stable, and they can be prepared with very high levels of enantioselectivity. Additionally they undergo a broad array of transformations that lead to the stereocontrolled formation of C-C and C-X (X = heteroatom) bonds. This versatility makes boronic acids ideal building blocks for iterative molecular assembly. A powerful reaction platform for chemical diversification using chiral boronic esters is their homologation using lithium carbenoids via 1,2-metalate rearrangement. In the 1980s, Matteson described the use of boronic esters bearing a chiral diol in a two-step homologation process with dichloromethyl lithium and Grignard reagents (substrate-controlled approach). We have focused on reagent control and have found that Hoppe's chiral lithiated carbamates can be used as carbenoid equivalents in conjunction with achiral boronic esters. This reagent-controlled process offers many advantages due to the easy access of both the chiral lithiated carbamates and stable boronic esters. The carbamates can be derived from primary or secondary alcohols, and a broad range of functionalized boronic esters and boranes can be employed. Multiple homologations can be carried out in a one-pot sequence thereby streamlining the process to a single operation. This methodology has enabled the synthesis of many molecules containing multiple contiguous stereogenic centers with exquisite 3-D control. In this Account, we trace our own studies to establish the lithiation-borylation methodology and describe selected synthetic applications.
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Affiliation(s)
- Daniele Leonori
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, U.K
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Stavber G, Časar Z. CuIIand Cu0Catalyzed Mono Borylation of Unsaturated Hydrocarbons with B2pin2: Entering into the Water. ChemCatChem 2014. [DOI: 10.1002/cctc.201402176] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Yang S, Zhu SF, Guo N, Song S, Zhou QL. Carboxy-directed asymmetric hydrogenation of α-alkyl-α-aryl terminal olefins: highly enantioselective and chemoselective access to a chiral benzylmethyl center. Org Biomol Chem 2014; 12:2049-52. [PMID: 24569889 DOI: 10.1039/c4ob00018h] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A carboxy-directed asymmetric hydrogenation of α-alkyl-α-aryl terminal olefins was developed by using a chiral spiro iridium catalyst, providing a highly efficient approach to the compounds with a chiral benzylmethyl center. The carboxy-directed hydrogenation prohibited the isomerization of the terminal olefins, and realized the chemoselective hydrogenation of various dienes. The concise enantioselective syntheses of (S)-curcudiol and (S)-curcumene were achieved by using this catalytic asymmetric hydrogenation as a key step.
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Affiliation(s)
- Shuang Yang
- State Key Laboratory and Institute of Elemento-organic Chemistry, Nankai University, Tianjin 300071, China
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Abstract
This review covers the isolation, structural determination, synthesis and chemical and microbiological transformations of natural sesquiterpenoids. The literature from January to December 2012 is reviewed, and 471 references are cited.
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Affiliation(s)
- Braulio M Fraga
- Instituto de Productos Naturales y Agrobiología, CSIC, 38206-La Laguna, Tenerife, Canary Islands, Spain
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Feng J, Zhu G, Liu B, Zhou X. Expedient Synthesis of (R)-Curcuphenol: A Chiral Pool Strategy. CHINESE J CHEM 2012. [DOI: 10.1002/cjoc.201201024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Roesner S, Aggarwal VK. Enantioselective synthesis of (R)-tolterodine using lithiation/borylation–protodeboronation methodology. CAN J CHEM 2012; 90:965. [DOI: 10.1139/v2012-069] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The synthesis of the pharmaceutical (R)-tolterodine is reported using lithiation/borylation–protodeboronation of a homoallyl carbamate as the key step. This step was tested with two permutations: an electron-neutral aryl Li-carbamate reacting with an electron-rich boronic ester and an electron-rich aryl Li-carbamate reacting with an electron-neutral boronic ester. It was found that the latter arrangement was considerably better than the former. Further improvements were achieved using magnesium bromide in methanol leading to a process that gave high yield and high enantioselectivity in the lithiation/borylation reaction. The key step was used in an efficient synthesis of (R)-tolterodine in a total of eight steps in a 30% overall yield and 90% ee.
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Affiliation(s)
- Stefan Roesner
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, UK
| | - Varinder K. Aggarwal
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, UK
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