1
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Barešić L, Margetić D, Glasovac Z. Anion-Controlled Synthesis of Novel Guanidine-Substituted Oxanorbornanes. Int J Mol Sci 2022; 23:ijms232416036. [PMID: 36555678 PMCID: PMC10375892 DOI: 10.3390/ijms232416036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 12/08/2022] [Accepted: 12/13/2022] [Indexed: 12/23/2022] Open
Abstract
The cycloaddition of simple alkyl-substituted guanidine derivatives is an interesting approach toward polycyclic superbases and guanidine-based organocatalysts. Due to the high nucleophilicity of guanidines, an aza-Michael reaction with dienophiles is more common and presents a huge obstacle in achieving the desired synthetic goal. Our preliminary investigations indicated that the proton could act as a suitable protecting group to regulate the directionality of the reaction. To investigate the role of the protonation state and type of anion, the reactivity of furfuryl guanidines with dimethyl acetylenedicarboxylate was explored. Furfuryl guanidines showed a strong reaction dependence on the nucleophilicity of the counterion and the structure of guanidine. While the reaction of DMAD with the guanidinium halides provided products of an aza-Michael addition, Diels-Alder cycloaddition occurred if non-nucleophilic hexafluorophosphate salts were used. Depending on the structure and the reaction conditions, oxanorbornadiene products underwent subsequent intramolecular cyclization. A tendency toward intramolecular cyclization was interpreted in terms of the pKa of different positions of the guanidine functionality in oxanorbornadienes. New polycyclic guanidines had a slightly decreased pKa in acetonitrile and well-defined geometry suitable for the buildup of selective sensors.
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Affiliation(s)
- Luka Barešić
- Laboratory for Physical Organic Chemistry, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Davor Margetić
- Laboratory for Physical Organic Chemistry, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Zoran Glasovac
- Laboratory for Physical Organic Chemistry, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
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2
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Kaur C, Sharma S, Thakur A, Sharma R. ASYMMETRIC SYNTHESIS: A GLANCE AT VARIOUS METHODOLOGIES FOR DIFFERENT FRAMEWORKS. CURR ORG CHEM 2022. [DOI: 10.2174/1385272826666220610162605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abstract:
Asymmetric reactions have made a significant advancement over the past few decades and involved the production of enantiomerically pure molecules using enantioselective organocatalysis, chiral auxiliaries/substrates, and reagents via controlling the absolute stereochemistry. The laboratory synthesis from an enantiomerically impure starting material gives a combination of enantiomers which are difficult to separate for chemists in the fields of medicine, chromatography, pharmacology, asymmetric synthesis, studies of structure-function relationships of proteins, life sciences and mechanistic studies. This challenging step of separation can be avoided by the use of asymmetric synthesis. Using pharmacologically relevant scaffolds/pharmacophores, the drug designing can also be achieved using asymmetric synthesis to synthesize receptor specific pharmacologically active chiral molecules. This approach can be used to synthesize asymmetric molecules from wide variety of reactants using specific asymmetric conditions which is also beneficial for environment due to less usage and discharge of chemicals into the environment. So, in this review, we have focused on the inclusive collation of diverse mechanisms in this area, to encourage auxiliary studies of asymmetric reactions to develop selective, efficient, environment-friendly and high yielding advanced processes in asymmetric reactions.
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Affiliation(s)
- Charanjit Kaur
- Department of Pharmaceutical Chemistry, Khalsa College of Pharmacy, Amritsar, Punjab, 143002
| | - Sachin Sharma
- School of Pharmacy, Taipei Medical University, Taiwan
| | | | - Ram Sharma
- School of Pharmacy, Taipei Medical University, Taiwan
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3
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Song Y, Du D. Recent Advances in Catalytic Asymmetric Aza‐Michael Addition Triggered Cascade Reactions. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100624] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yong‐Xing Song
- College of Pharmacy Hebei University of Chinese Medicine Shijiazhuang 050200 Hebei Province People's Republic of China
| | - Da‐Ming Du
- School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 100081 People's Republic of China
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4
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Zhang JL, Ye WL, Zhang J, Hu XQ, Xu PF. Enantioselective Construction of Polycyclic Indazole Skeletons Bearing Five Consecutive Chiral Centers through an Asymmetric Triple-Reaction Sequence. Org Lett 2021; 23:5033-5038. [PMID: 34138570 DOI: 10.1021/acs.orglett.1c01559] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel approach for the asymmetric construction of polycyclic indazole skeletons via enamine-imine activation and PCET activation was developed by merging organocatalysis with photocatalysis through an asymmetric triple-reaction sequence. In this process, five C-X bonds and five consecutive chiral centers were efficiently constructed. Differently substituted polycyclic indazole deriatives were successfully constructed with satisfactory results under mild conditions.
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Affiliation(s)
- Jia-Lu Zhang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Wen-Long Ye
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Jie Zhang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Xiu-Qin Hu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Peng-Fei Xu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
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5
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Makra Z, Bényei A, Puskás LG, Kanizsai I. One‐Pot Access towards 4,5‐Disubstituted 2‐Amino‐1
H
‐imidazoles Starting from Mannich Substrates and their Transformation Utilities. European J Org Chem 2020. [DOI: 10.1002/ejoc.202001253] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Zsófia Makra
- AVIDIN Ltd. Alsó kiköt– sor 11/D 6726 Szeged Hungary
| | - Attila Bényei
- Department of Physical Chemistry Laboratory for X‐ray Diffraction University of Debrecen Egyetem tér 1 4032 Debrecen Hungary
| | | | - Iván Kanizsai
- AVIDIN Ltd. Alsó kiköt– sor 11/D 6726 Szeged Hungary
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6
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Zheng J, He M, Xie B, Yang L, Hu Z, Zhou HB, Dong C. Enantioselective synthesis of novel pyrano[3,2-c]chromene derivatives as AChE inhibitors via an organocatalytic domino reaction. Org Biomol Chem 2019; 16:472-479. [PMID: 29265146 DOI: 10.1039/c7ob02794j] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of optically active pyrano[3,2-c]chromenes have been synthesized through an asymmetric domino reaction of 4-hydroxy-2H-chromen-2-ones with malononitriles. The targeted molecules were obtained in excellent yields and enantioselectivities (up to 94% yield, 99% ee). The AChE inhibitory activity studies revealed that compounds 4n (IC50 = 21.3 μM) and 4p (IC50 = 19.2 μM) displayed potent acetylcholinesterase inhibition. In most cases, the S-enantiomers were superior to the corresponding R-enantiomers. Moreover, molecular modelling provides a practical method for understanding the enantioselective discrimination of AChE with these kinds of compounds.
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Affiliation(s)
- Jie Zheng
- State Key Laboratory of Virology, Hubei Province Engineering and Technology Research Center for Fluorinated Pharmaceuticals, Wuhan University School of Pharmaceutical Sciences, Wuhan 430071, China.
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7
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Vinogradov MG, Turova OV, Zlotin SG. Recent advances in the asymmetric synthesis of pharmacology-relevant nitrogen heterocycles via stereoselective aza-Michael reactions. Org Biomol Chem 2019; 17:3670-3708. [DOI: 10.1039/c8ob03034k] [Citation(s) in RCA: 85] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In this review, recent applications of a stereoselective aza-Michael reaction for asymmetric synthesis of naturally occurring N-containing heterocyclic scaffolds and their usefulness to pharmacology are summarized.
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Affiliation(s)
- Maxim G. Vinogradov
- N.D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- 119991 Moscow
- Russian Federation
| | - Olga V. Turova
- N.D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- 119991 Moscow
- Russian Federation
| | - Sergei G. Zlotin
- N.D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- 119991 Moscow
- Russian Federation
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8
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Hoang GL, Søholm Halskov K, Ellman JA. Synthesis of Azolo[1,3,5]triazines via Rhodium(III)-Catalyzed Annulation of N-Azolo Imines and Dioxazolones. J Org Chem 2018; 83:9522-9529. [PMID: 29947517 DOI: 10.1021/acs.joc.8b01249] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A wide range of azolo[1,3,5]triazines were obtained by Rh(III)-catalyzed annulation of N-azolo imines and dioxazolones. The reaction proceeds by the first catalytic C-H amidation of an imidoyl C-H bond followed by cyclodehydration. Good yields were obtained for N-azolo imines derived from aminoazoles and aromatic and heteroaromatic aldehydes. A range of dioxazolone amidating reagents were employed to introduce aryl, heteroaryl, and alkyl substituents. The reaction was also performed with a benchtop setup at 1 mmol scale using microwave heating.
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Affiliation(s)
- Gia L Hoang
- Department of Chemistry , Yale University , 225 Prospect Street , New Haven , Connecticut 06520 , United States
| | - Kim Søholm Halskov
- Department of Chemistry , Yale University , 225 Prospect Street , New Haven , Connecticut 06520 , United States
| | - Jonathan A Ellman
- Department of Chemistry , Yale University , 225 Prospect Street , New Haven , Connecticut 06520 , United States
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9
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Guchhait SK, Hura N, Shah AP. Synthesis of Polysubstituted 2-Aminoimidazoles via Alkene-Diamination of Guanidine with Conjugated α-Bromoalkenones. J Org Chem 2017; 82:2745-2752. [PMID: 28195472 DOI: 10.1021/acs.joc.6b03021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A step-economical access to polysubstituted aminoimidazoles has been accomplished via alkene vicinal C-N bonds formation of 2-bromo-2-alkenones with guanidine avoiding its NH-protection/derivatization prerequisite for electronic modulation. The approach has excellent substrate scope, is amenable to diverse guanidine-containing substrates, and introduces distinctive substitutions/functionalities into aminoimidazole core. It is also applicable to preparation of fused-imidazoles. The reaction involves a tandem pathway of aza-Michael addition, SN2, and a unique redox-neutral process, as evident by spectroscopic study and control experiments.
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Affiliation(s)
- Sankar K Guchhait
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER) , Sector 67, SAS Nagar (Mohali), Punjab 160062, India
| | - Neha Hura
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER) , Sector 67, SAS Nagar (Mohali), Punjab 160062, India
| | - Archana P Shah
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER) , Sector 67, SAS Nagar (Mohali), Punjab 160062, India
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10
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Lepitre T, Denhez C, Sanselme M, Othman M, Lawson AM, Daïch A. Original Mitsunobu-Triggered Sequence Involved in a One-Pot Domino Process toward Tetracyclic Systems Bearing a Bis-N,O-acetal Junction. J Org Chem 2016; 81:8837-8849. [DOI: 10.1021/acs.joc.6b01523] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thomas Lepitre
- Normandie Univ,
France, UNILEHAVRE, URCOM, EA 3221, FR 3038 CNRS, F-76600 Le Havre, France
| | - Clement Denhez
- Université
de Reims Champagne Ardenne, Institut de Chimie Moléculaire
de Reims, CNRS UMR 7312, UFR de Pharmacie, 51 rue Cognacq-Jay, 51096 Cedex Reims, France
- Multiscale
Molecular Modeling Platform, Université de Reims Champagne-Ardenne, UFR Sciences Exactes et Naturelles, F-51687 Cedex 2 Reims, France
| | - Morgane Sanselme
- Normandie Univ,
France; UNIROUEN, Laboratoire SMS EA3233, 1 rue Tesniere, France, F-76821 Mont Saint Aignan, France
| | - Mohamed Othman
- Normandie Univ,
France, UNILEHAVRE, URCOM, EA 3221, FR 3038 CNRS, F-76600 Le Havre, France
| | - Ata Martin Lawson
- Normandie Univ,
France, UNILEHAVRE, URCOM, EA 3221, FR 3038 CNRS, F-76600 Le Havre, France
| | - Adam Daïch
- Normandie Univ,
France, UNILEHAVRE, URCOM, EA 3221, FR 3038 CNRS, F-76600 Le Havre, France
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11
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Giardinetti M, Marrot J, Moreau X, Coeffard V, Greck C. Asymmetric Synthesis of Fused Polycyclic Indazoles through Aminocatalyzed Aza-Michael Addition/Intramolecular Cyclization. J Org Chem 2016; 81:6855-61. [DOI: 10.1021/acs.joc.6b01201] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Maxime Giardinetti
- Institut
Lavoisier de Versailles, UMR CNRS 8180, Université de Versailles-St-Quentin-en-Yvelines, 45 Avenue des États-Unis, 78035 Versailles cedex, France
| | - Jérôme Marrot
- Institut
Lavoisier de Versailles, UMR CNRS 8180, Université de Versailles-St-Quentin-en-Yvelines, 45 Avenue des États-Unis, 78035 Versailles cedex, France
| | - Xavier Moreau
- Institut
Lavoisier de Versailles, UMR CNRS 8180, Université de Versailles-St-Quentin-en-Yvelines, 45 Avenue des États-Unis, 78035 Versailles cedex, France
| | - Vincent Coeffard
- Institut
Lavoisier de Versailles, UMR CNRS 8180, Université de Versailles-St-Quentin-en-Yvelines, 45 Avenue des États-Unis, 78035 Versailles cedex, France
| | - Christine Greck
- Institut
Lavoisier de Versailles, UMR CNRS 8180, Université de Versailles-St-Quentin-en-Yvelines, 45 Avenue des États-Unis, 78035 Versailles cedex, France
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12
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Dou QY, Tu YQ, Zhang Y, Tian JM, Zhang FM, Wang SH. Spiro-Pyrrolidine-Catalyzed Asymmetric Conjugate Addition of Hydroxylamine to Enals and 2,4-Dienals. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201501025] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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13
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Chen SW, Zhang GC, Lou QX, Cui W, Zhang SS, Hu WH, Zhao JL. Organocatalytic Enantioselective Aza-Michael Reaction of Benzotriazole to β,β-Disubstituted Nitroalkenes. ChemCatChem 2015. [DOI: 10.1002/cctc.201500373] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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14
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Goel R, Luxami V, Paul K. Synthetic approaches and functionalizations of imidazo[1,2-a]pyrimidines: an overview of the decade. RSC Adv 2015. [DOI: 10.1039/c5ra14795f] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This review gives an overview to the synthesis of the imidazo[1,2-a]pyrimidines on the basis of multicomponent reactions, condensation reactions, intramolecular cyclizations etc. along with its reactivity at 3-position.
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Affiliation(s)
- Richa Goel
- School of Chemistry and Biochemistry
- Thapar University
- Patiala-147004
- India
| | - Vijay Luxami
- School of Chemistry and Biochemistry
- Thapar University
- Patiala-147004
- India
| | - Kamaldeep Paul
- School of Chemistry and Biochemistry
- Thapar University
- Patiala-147004
- India
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15
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Zhang J, Zhang Y, Liu X, Guo J, Cao W, Lin L, Feng X. Enantioselective Protonation by Aza-Michael Reaction between Pyrazoles and α-Substituted Vinyl Ketones. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400616] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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16
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Liang Q, He J, Ni B. Asymmetric domino Michael–Henry reaction of 1,2-diones with nitroolefins catalyzed by a chiral bisoxazolidine–Ni(acac)2 complex. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.tetasy.2014.06.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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17
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Guo J, Sun X, Yu S. Diastereoselective synthesis of epoxide-fused benzoquinolizidine derivatives using intramolecular domino aza-Michael addition/Darzens reaction. Org Biomol Chem 2014; 12:265-8. [DOI: 10.1039/c3ob42068j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Jiajia Guo
- State Key Laboratory of Analytical Chemistry for Life Science, Institute of Chemical Biology and Drug Innovation, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
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18
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Fu N, Zhang L, Luo S, Cheng JP. Chiral primary amine catalysed asymmetric conjugate addition of azoles to α-substituted vinyl ketones. Org Chem Front 2014. [DOI: 10.1039/c3qo00027c] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Huang XF, Zhang YF, Qi ZH, Li NK, Geng ZC, Li K, Wang XW. Organocatalytic enantioselective construction of multi-functionalized spiro oxindole dienes. Org Biomol Chem 2014; 12:4372-85. [DOI: 10.1039/c4ob00545g] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Goudedranche S, Pierrot D, Constantieux T, Bonne D, Rodriguez J. A temporary-bridge strategy for enantioselective organocatalyzed synthesis of aza-seven-membered rings. Chem Commun (Camb) 2014; 50:15605-8. [DOI: 10.1039/c4cc07731h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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21
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Lee HJ, Cho CW. Asymmetric Synthesis of Chiral Pyrrolizine-Based Triheterocycles by Organocatalytic Cascade Aza-Michael-Aldol Reactions. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301260] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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22
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Ghosh AK, Zhou B. Bifunctional cinchona alkaloid-squaramide-catalyzed highly enantioselective aza-Michael addition of indolines to α,β-unsaturated ketones. Tetrahedron Lett 2013; 54:3500-3502. [PMID: 24014895 PMCID: PMC3763959 DOI: 10.1016/j.tetlet.2013.04.080] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
An enantioselective aza-Michael addition of indolines to α,β-unsaturated ketones was achieved using a bifunctional cinchona alkaloid-derived chiral squaramide derivative. Various β-indolinyl ketone derivatives were obtained in good to excellent yields and with high enantioselectivity. DDQ or MnO2 oxidation of indoline derivatives provided convenient access to various enantioenriched N-substituted indole derivatives.
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Affiliation(s)
- Arun K. Ghosh
- Department of Chemistry and Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, United States
| | - Bing Zhou
- Department of Chemistry and Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, United States
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23
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Veerasamy N, Carlson EC, Collett ND, Saha M, Carter RG. Enantioselective approach to quinolizidines: total synthesis of cermizine D and formal syntheses of senepodine G and cermizine C. J Org Chem 2013; 78:4779-800. [PMID: 23627426 DOI: 10.1021/jo400324t] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The formal syntheses of C5-epi-senepodine G and C5-epi-cermizine C have been accomplished through a novel diastereoselective, intramolecular amide Michael addition process. The total synthesis of cermizine D has been achieved through use of an organocatalyzed, heteroatom Michael addition to access a common intermediate. Additional key steps of this sequence include a matched, diastereoselective alkylation with an iodomethylphenyl sulfide and sulfone-aldehyde coupling/reductive desulfurization sequence to combine the major subunits. The utility of a Hartwig-style C-N coupling has been explored on functionally dense coupling partners. Diastereoselective conjugate additions to α,β-unsaturated sulfones have been investigated, which provided the key sulfone intermediate in just six steps from commercially available starting materials. The formal syntheses of senepodine G and cermizine C have been accomplished through an intramolecular cyclization process of a N-Boc-protected piperidine sulfone.
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Affiliation(s)
- Nagarathanam Veerasamy
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, Oregon 97331, USA
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24
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Lee HJ, Cho CW. Cinchona-Based Primary Amine-Catalyzed Asymmetric Cascade Aza-Michael–Aldol Reactions of Enones with 2-(1H-Pyrrol-2-yl)-2-oxoacetates: Synthesis of Chiral Pyrrolizines with Multistereocenters. J Org Chem 2013; 78:3306-12. [DOI: 10.1021/jo4001614] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Hyo-Jun Lee
- Department of Chemistry, Kyungpook National University, Daegu 702-701, Republic of Korea
| | - Chang-Woo Cho
- Department of Chemistry, Kyungpook National University, Daegu 702-701, Republic of Korea
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25
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Ding XH, Li X, Liu D, Cui WC, Ju X, Wang S, Yao ZJ. Target-oriented multifunctional organocatalysis for enantioselective synthesis of bicyclo[3.3.1]nona-2,6-dien-9-ones. A formal asymmetric synthesis of huperzine A. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.05.061] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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26
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Wang J, Li P, Choy PY, Chan ASC, Kwong FY. Advances and Applications in Organocatalytic Asymmetric aza-Michael Addition. ChemCatChem 2012. [DOI: 10.1002/cctc.201200135] [Citation(s) in RCA: 138] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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27
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Yokosaka T, Hamajima A, Nemoto T, Hamada Y. Asymmetric synthesis of highly functionalized γ-lactams through an organocatalytic aza-Michael–Michael reaction cascade using fumaric acid amide esters as multi-reactive substrates. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2011.12.114] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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28
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