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Neetha M, Saranya PV, Philip RM, Anilkumar G. An Overview of Silver‐Catalyzed Mannich Reactions. ChemistrySelect 2021. [DOI: 10.1002/slct.202102452] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Mohan Neetha
- School of Chemical Sciences Mahatma Gandhi University, Priyadarsini Hills P O Kottayam Kerala INDIA 686560
| | - Padinjare Veetil Saranya
- School of Chemical Sciences Mahatma Gandhi University, Priyadarsini Hills P O Kottayam Kerala INDIA 686560
| | - Rose Mary Philip
- School of Chemical Sciences Mahatma Gandhi University, Priyadarsini Hills P O Kottayam Kerala INDIA 686560
| | - Gopinathan Anilkumar
- School of Chemical Sciences Mahatma Gandhi University, Priyadarsini Hills P O Kottayam Kerala INDIA 686560
- Institute for Integrated programmes and Research in Basic Sciences (IIRBS) Mahatma Gandhi University, Priyadarsini Hills P O Kottayam Kerala INDIA 686560
- Advanced Molecular Materials Research Centre (AMMRC) Mahatma Gandhi University, Priyadarsini Hills P O Kottayam Kerala INDIA 686560
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2
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Connon R, Roche B, Rokade BV, Guiry PJ. Further Developments and Applications of Oxazoline-Containing Ligands in Asymmetric Catalysis. Chem Rev 2021; 121:6373-6521. [PMID: 34019404 PMCID: PMC8277118 DOI: 10.1021/acs.chemrev.0c00844] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Indexed: 12/27/2022]
Abstract
The chiral oxazoline motif is present in many ligands that have been extensively applied in a series of important metal-catalyzed enantioselective reactions. This Review aims to provide a comprehensive overview of the most significant applications of oxazoline-containing ligands reported in the literature starting from 2009 until the end of 2018. The ligands are classified not by the reaction to which their metal complexes have been applied but by the nature of the denticity, chirality, and donor atoms involved. As a result, the continued development of ligand architectural design from mono(oxazolines), to bis(oxazolines), to tris(oxazolines) and tetra(oxazolines) and variations thereof can be more easily monitored by the reader. In addition, the key transition states of selected asymmetric transformations will be given to illustrate the features that give rise to high levels of asymmetric induction. As a further aid to the reader, we summarize the majority of schemes with representative examples that highlight the variation in % yields and % ees for carefully selected substrates. This Review should be of particular interest to the experts in the field but also serve as a useful starting point to new researchers in this area. It is hoped that this Review will stimulate both the development/design of new ligands and their applications in novel metal-catalyzed asymmetric transformations.
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Affiliation(s)
- Robert Connon
- Synthesis
and Solid State Pharmaceutical Centre, Centre for Synthesis and Chemical
Biology, School of Chemistry, University
College Dublin, Dublin
4, Ireland
| | - Brendan Roche
- Synthesis
and Solid State Pharmaceutical Centre, Centre for Synthesis and Chemical
Biology, School of Chemistry, University
College Dublin, Dublin
4, Ireland
| | - Balaji V. Rokade
- BiOrbic
Research Centre, Centre for Synthesis and Chemical Biology, School
of Chemistry, University College Dublin, Dublin 4, Ireland
| | - Patrick J. Guiry
- Synthesis
and Solid State Pharmaceutical Centre, Centre for Synthesis and Chemical
Biology, School of Chemistry, University
College Dublin, Dublin
4, Ireland
- BiOrbic
Research Centre, Centre for Synthesis and Chemical Biology, School
of Chemistry, University College Dublin, Dublin 4, Ireland
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Guanidine-Amide-Catalyzed Aza-Henry Reaction of Isatin-Derived Ketimines: Origin of Selectivity and New Catalyst Design. Molecules 2021; 26:molecules26071965. [PMID: 33807341 PMCID: PMC8037019 DOI: 10.3390/molecules26071965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 03/29/2021] [Accepted: 03/29/2021] [Indexed: 12/05/2022] Open
Abstract
Density functional theory (DFT) calculations were performed to investigate the mechanism and the enantioselectivity of the aza-Henry reaction of isatin-derived ketimine catalyzed by chiral guanidine–amide catalysts at the M06-2X-D3/6-311+G(d,p)//M06-2X-D3/6-31G(d,p) (toluene, SMD) theoretical level. The catalytic reaction occurred via a three-step mechanism: (i) the deprotonation of nitromethane by a chiral guanidine–amide catalyst; (ii) formation of C–C bonds; (iii) H-transfer from guanidine to ketimine, accompanied with the regeneration of the catalyst. A dual activation model was proposed, in which the protonated guanidine activated the nitronate, and the amide moiety simultaneously interacted with the ketimine substrate by intermolecular hydrogen bonding. The repulsion of CPh3 group in guanidine as well as N-Boc group in ketimine raised the Pauli repulsion energy (∆EPauli) and the strain energy (∆Estrain) of reacting species in the unfavorable si-face pathway, contributing to a high level of stereoselectivity. A new catalyst with cyclopropenimine and 1,2-diphenylethylcarbamoyl as well as sulfonamide substituent was designed. The strong basicity of cyclopropenimine moiety accelerated the activation of CH3NO2 by decreasing the energy barrier in the deprotonation step. The repulsion between the N-Boc group in ketimine and cyclohexyl group as well as chiral backbone in the new catalyst raised the energy barrier in C–C bond formation along the si-face attack pathway, leading to the formation of R-configuration product. A possible synthetic route for the new catalyst is also suggested.
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Zhou K, Bao M, Sha H, Dong G, Hong K, Xu X, Hu W. Highly diastereoselective synthesis of vicinal diamines via a Rh-catalyzed three-component reaction of diazo compounds with diarylmethanimines and ketimines. Org Chem Front 2021. [DOI: 10.1039/d1qo00083g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A Rh-catalyzed selective three-component reaction of diazo compounds with diarylmethanimines and ketimines is reported that offers an efficient and convenient access to vicinal diamine derivatives with two tertiary stereocenters in high yields.
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Affiliation(s)
- Kai Zhou
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- China
| | - Ming Bao
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- China
| | - Hongkai Sha
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- China
| | - Guizhi Dong
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- China
| | - Kemiao Hong
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- China
| | - Xinfang Xu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- China
| | - Wenhao Hu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- China
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Guan H, Cao X, Walsh PJ, Mao J. One-Pot Aminoalkylation of Aldehydes: Diastereoselective Synthesis of Vicinal Diamines with Azaarylmethylamines. Org Lett 2019; 21:8679-8683. [DOI: 10.1021/acs.orglett.9b03287] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Haixing Guan
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P.R. China
| | - Xianzhong Cao
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P.R. China
| | - Patrick J. Walsh
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Jianyou Mao
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P.R. China
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Abstract
Background:
α-Aryl substituted nitroalkanes are important synthetic intermediates
for the preparation of pharmaceutical molecules, natural products, and functional
materials. Due to their scare existence in Nature, synthesis of these compounds has attracted
the attention of synthetic and medicinal chemists, rendering α-arylation of nitroalkanes
of an important research topic. This article summarizes the important advances of α-
arylation of nitroalkanes since 1963.
Results:
After a brief introduction of the synthetic application and the reactions of nitroalkanes,
this article reviewed the synthetic methods for the α-arylated aliphatic nitro compound.
The amount of research on α-arylation of nitroalkanes using various arylation reagents
and the discovery of elegant synthetic approaches towards such skeleton have been
discussed. This review described these advances in two sections. One is the arylation of non-activated nitroalkanes,
with an emphasis on the application of diverse arylation reagents; the other focuses on the arylation of
activated nitroalkanes, including dinitroalkanes, trinitroalkanes, α-nitrosulfones, α-nitroesters, α-nitrotoluenes,
and α-nitroketones. The synthetic application of these methods has also been presented in some cases.
Conclusion:
In this review, we described the progress of α-arylation of nitroalkanes. Although the immense
amount of research on α-arylation of aliphatic nitro compounds has been achieved, many potential issues still
need to be addressed, especially the asymmetric transformation and its wide application in organic synthesis.
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Affiliation(s)
- Peng-Fei Zheng
- Department of General Surgery, Lanzhou University Second Hospital, Lanzhou University, Lanzhou 730000, China
| | - Yang An
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Zuo-Yi Jiao
- Department of General Surgery, Lanzhou University Second Hospital, Lanzhou University, Lanzhou 730000, China
| | - Zhou-Bao Shi
- Affiliate Hospital of Gansu University of Chinese Medicine, Lanzhou 730000, China
| | - Fu-Min Zhang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
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Kumar D, Prakasham A, Gangwar MK, Ghosh P. Solvent-free cyanosilylation of aromatic and heteroaryl aldehydes catalyzed by a cationic iron N-heterocyclic carbene complex at ambient temperature under UV irradiation. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.119003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Marčeková M, Gerža P, Šoral M, Moncol J, Berkeš D, Kolarovič A, Jakubec P. Crystallization Does It All: An Alternative Strategy for Stereoselective Aza-Henry Reaction. Org Lett 2019; 21:4580-4584. [PMID: 31184186 DOI: 10.1021/acs.orglett.9b01489] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
An efficient and experimentally straightforward method for the stereoselective synthesis of a variety of β-nitro-α-amino carboxylic acids via aza-Henry (nitro-Mannich) reaction of aldimines is disclosed, yielding either anti- or a rarely reported syn-configuration. The reaction operates directly on free glyoxylic acid and generates imine species in situ. Crystallization-controlled diastereoselectivity enables isolation of the target compounds in high enantio- and diastereomeric purities by a simple filtration.
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Affiliation(s)
- Michaela Marčeková
- Faculty of Chemical and Food Technology , Slovak University of Technology , Radlinského 9 , 812 37 Bratislava , Slovakia
| | - Peter Gerža
- Faculty of Chemical and Food Technology , Slovak University of Technology , Radlinského 9 , 812 37 Bratislava , Slovakia
| | - Michal Šoral
- Faculty of Chemical and Food Technology , Slovak University of Technology , Radlinského 9 , 812 37 Bratislava , Slovakia
| | - Ján Moncol
- Faculty of Chemical and Food Technology , Slovak University of Technology , Radlinského 9 , 812 37 Bratislava , Slovakia
| | - Dušan Berkeš
- Faculty of Chemical and Food Technology , Slovak University of Technology , Radlinského 9 , 812 37 Bratislava , Slovakia
| | - Andrej Kolarovič
- Department of Chemistry, Faculty of Education , Trnava University , Priemyselná 4 , 918 43 Trnava , Slovakia
| | - Pavol Jakubec
- Faculty of Chemical and Food Technology , Slovak University of Technology , Radlinského 9 , 812 37 Bratislava , Slovakia
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Rohit KR, Ujwaldev SM, Saranya S, Anilkumar G. Recent Advances in the Creation of Asymmetric Carbon Centre(s) by Generation of Carbon‐Heteroatom Bond(s) Using Metal‐Pybox Complexes. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800488] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- K. R. Rohit
- School of Chemical SciencesMahatma Gandhi University Priyadarsini Hills P O Kottayam 686 560 INDIA
| | | | - Salim Saranya
- School of Chemical SciencesMahatma Gandhi University Priyadarsini Hills P O Kottayam 686 560 INDIA
| | - Gopinathan Anilkumar
- School of Chemical SciencesMahatma Gandhi University Priyadarsini Hills P O Kottayam 686 560 INDIA
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