1
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Chen X, He P, Xia S, Cui L, Zhong G, Yang L. NHC-Activations on α-, β-, γ-, and Beyond. CHEM REC 2023:e202200279. [PMID: 36916715 DOI: 10.1002/tcr.202200279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Revised: 02/27/2023] [Indexed: 03/15/2023]
Abstract
Over the recent decades, due to the special electronic characteristics and diverse reactivities, N-heterocyclic carbene (NHC) has received significant interest in organocatalyzed reactions. The formation of Breslow intermediates by NHC can convert into acyl anion equivalent, enolates, homoenolate, acyl azolium, and vinyl enolate etc., and the cycloaddition reactions of these species has attracted lots of attention. In this review, we focus on the summry of the development of NHC-activation of carbonyl carbon (or imine carbon) in situ, α-, β-, γ-, and beyond, and the cycloaddition reaction of these species.
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Affiliation(s)
- Xiaoyu Chen
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China
| | - Pengyu He
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China
| | - Siqi Xia
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China
| | - Lixin Cui
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China
| | - Guofu Zhong
- Department of Chemistry, Eastern Institute for Advanced Study, Ningbo, 315200, China.,School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, Shandong, China
| | - Limin Yang
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, China
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2
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Mondal S, Ghosh A, Biju AT. N-Heterocyclic Carbene (NHC)-Catalyzed Transformations Involving Azolium Enolates. CHEM REC 2022; 22:e202200054. [PMID: 35562645 DOI: 10.1002/tcr.202200054] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 04/19/2022] [Indexed: 11/08/2022]
Abstract
The recent advances in the N-heterocyclic carbene (NHC)-organocatalyzed generation of azolium enolate intermediates and their subsequent interception with electrophiles are highlighted. The NHC-bound azolium intermediates are generated by the addition of NHCs to suitably substituted aldehydes, acid derivatives or ketenes. A broad range of coupling partners can intercept the azolium enolates to form [2+n] cycloadducts (n=2,3,4) and various α-functionalized compounds. The enantioselective synthesis of the target compounds are achieved with the use of chiral NHCs. Herein, we summarized the development that occurred in this subclass of NHC catalysis.
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Affiliation(s)
- Santigopal Mondal
- Department of Organic Chemistry, Indian Institute of Science, Bangalore, 560012
| | - Arghya Ghosh
- Department of Organic Chemistry, Indian Institute of Science, Bangalore, 560012
| | - Akkattu T Biju
- Department of Organic Chemistry, Indian Institute of Science, Bangalore, 560012
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3
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Gudise VB, Settipalli PC, Reddy YP, Anwar S. Organocascade Synthesis of Spiro[chroman‐3,2′‐indanedione] Scaffolds via [4+2] or [1+1+4] Cyclisation. ChemistrySelect 2021. [DOI: 10.1002/slct.202103885] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Veera Babu Gudise
- Division of Chemistry Department of Sciences and Humanities Vignan's Foundation for Science Technology and Research Vadlamudi, Guntur 522 213 Andhra Pradesh India
| | - Poorna Chandrasekhar Settipalli
- Division of Chemistry Department of Sciences and Humanities Vignan's Foundation for Science Technology and Research Vadlamudi, Guntur 522 213 Andhra Pradesh India
| | - Yeruva Pavankumar Reddy
- Division of Chemistry Department of Sciences and Humanities Vignan's Foundation for Science Technology and Research Vadlamudi, Guntur 522 213 Andhra Pradesh India
| | - Shaik Anwar
- Division of Chemistry Department of Sciences and Humanities Vignan's Foundation for Science Technology and Research Vadlamudi, Guntur 522 213 Andhra Pradesh India
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4
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Abstract
Organocatalysts are abundantly used for various transformations, particularly to obtain highly enantio- and diastereomeric pure products by controlling the stereochemistry. These applications of organocatalysts have been the topic of several reviews. Organocatalysts have emerged as one of the very essential areas of research due to their mild reaction conditions, cost-effective nature, non-toxicity, and environmentally benign approach that obviates the need for transition metal catalysts and other toxic reagents. Various types of organocatalysts including amine catalysts, Brønsted acids, and Lewis bases such as N-heterocyclic carbene (NHC) catalysts, cinchona alkaloids, 4-dimethylaminopyridine (DMAP), and hydrogen bond-donating catalysts, have gained renewed interest because of their regioselectivity. In this review, we present recent advances in regiodivergent reactions that are governed by organocatalysts. Additionally, we briefly discuss the reaction pathways of achieving regiodivergent products by changes in conditions such as solvents, additives, or the temperature.
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5
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Zhao C, Blaszczyk SA, Wang J. Asymmetric reactions of N-heterocyclic carbene (NHC)-based chiral acyl azoliums and azolium enolates. GREEN SYNTHESIS AND CATALYSIS 2021. [DOI: 10.1016/j.gresc.2021.03.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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6
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Zhu BH, Zhang YQ, Xu HJ, Li L, Deng GC, Qian PC, Deng C, Ye LW. Regio- and Stereoselective Synthesis of Diverse 3,4-Dihydro-2-quinolones through Catalytic Hydrative Cyclization of Imine- and Carbonyl-Ynamides with Water. ACS Catal 2021. [DOI: 10.1021/acscatal.0c04786] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Bo-Han Zhu
- Key Laboratory for Chemical Biology of Fujian Province, State Key Laboratory of Physical Chemistry of Solid Surfaces, and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Ying-Qi Zhang
- Key Laboratory for Chemical Biology of Fujian Province, State Key Laboratory of Physical Chemistry of Solid Surfaces, and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Hao-Jin Xu
- Key Laboratory for Chemical Biology of Fujian Province, State Key Laboratory of Physical Chemistry of Solid Surfaces, and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Long Li
- Institute of New Materials & Industry Technology, College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Guo-Cheng Deng
- Key Laboratory for Chemical Biology of Fujian Province, State Key Laboratory of Physical Chemistry of Solid Surfaces, and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Peng-Cheng Qian
- Institute of New Materials & Industry Technology, College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Chao Deng
- Jiangsu Key Laboratory of Pesticide Science and Department of Chemistry, College of Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Long-Wu Ye
- Key Laboratory for Chemical Biology of Fujian Province, State Key Laboratory of Physical Chemistry of Solid Surfaces, and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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7
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Chen X, Wang H, Jin Z, Chi YR. N
‐Heterocyclic
Carbene Organocatalysis: Activation Modes and Typical Reactive Intermediates. CHINESE J CHEM 2020. [DOI: 10.1002/cjoc.202000107] [Citation(s) in RCA: 92] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Xingkuan Chen
- Department of Chemistry, Jinan University Guangzhou Guangdong 510632 China
| | - Hongling Wang
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University Huaxi District Guiyang Guizhou 550025 China
| | - Zhichao Jin
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University Huaxi District Guiyang Guizhou 550025 China
| | - Yonggui Robin Chi
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University Huaxi District Guiyang Guizhou 550025 China
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University Singapore 637371 Singapore
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8
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Wu Z, Wang J. A tandem dearomatization/rearomatization strategy: enantioselective N-heterocyclic carbene-catalyzed α-arylation. Chem Sci 2019; 10:2501-2506. [PMID: 30881680 PMCID: PMC6385844 DOI: 10.1039/c8sc04601h] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Accepted: 12/21/2018] [Indexed: 12/14/2022] Open
Abstract
In this study, the first example of carbene-catalyzed tandem dearomatization/rearomatization reaction of azonaphthalenes with α-chloroaldehydes is described.
In this study, the first example of the carbene-catalyzed tandem dearomatization/rearomatization reaction of azonaphthalenes with α-chloroaldehydes is described. This protocol enables the efficient assembly of chiral dihydrocinnolinone derivatives in good yields with excellent enantioselectivities (up to 99% ee). Moreover, this strategy enables not only the highly enantioselective NHC-catalyzed nucleophilic aromatic substitution, but also a formal Csp2–Csp3 bond formation.
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Affiliation(s)
- Zijun Wu
- School of Pharmaceutical Sciences , Key Laboratory of Bioorganic Phosphorous Chemistry and Chemical Biology , Ministry of Education , Tsinghua University , Beijing , 100084 , China .
| | - Jian Wang
- School of Pharmaceutical Sciences , Key Laboratory of Bioorganic Phosphorous Chemistry and Chemical Biology , Ministry of Education , Tsinghua University , Beijing , 100084 , China .
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9
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Jakkampudi S, Parella R, Zhao JCG. Stereoselective synthesis of chromane derivatives via a domino reaction catalyzed by modularly designed organocatalysts. Org Biomol Chem 2018; 17:151-155. [PMID: 30525178 PMCID: PMC6317902 DOI: 10.1039/c8ob02677g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A highly enantio- and diastereoselective method for the synthesis of functionalized chroman-2-ones and chromanes was achieved by using an organocatalytic domino Michael/hemiacetalization reaction of aliphatic aldehydes and (E)-2-(2-nitrovinyl)phenols followed by a PCC oxidation and dehydroxylation, respectively. Using the modularly designed organocatalysts (MDOs) self-assembled from cinchona alkaloid derivatives and amino acids in the reaction media, the title products were obtained in good to high yields (up to 97%) and excellent diastereoselectivities (up to 99 : 1 dr) and enantioselectivities (up to 99% ee).
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Affiliation(s)
- Satish Jakkampudi
- Department of Chemistry, University of Texas at San Antonio One UTSA Circle, San Antonio, TX 78249-0698, USA.
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10
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Lee J, Ko KM, Kim SG. Ni(ClO4
)2
-Catalyzed Friedel-Crafts Reaction of Coumarin-Fused Donor-Acceptor Cyclopropanes with Indoles: Stereoselective Synthesis of trans
-3,4-Disubstituted-3,4-dihydrocoumarins. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800669] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jusung Lee
- Department of Chemistry; Kyonggi University; 154-42 Gwanggyosan-ro,Yeongtong-gu, Suwon 16227 Republic of Korea
| | - Kwang Min Ko
- Department of Chemistry; Kyonggi University; 154-42 Gwanggyosan-ro,Yeongtong-gu, Suwon 16227 Republic of Korea
| | - Sung-Gon Kim
- Department of Chemistry; Kyonggi University; 154-42 Gwanggyosan-ro,Yeongtong-gu, Suwon 16227 Republic of Korea
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11
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Liu Q, Li S, Chen XY, Rissanen K, Enders D. Asymmetric Synthesis of Spiro-oxindole-ε-lactones through N-Heterocyclic Carbene Catalysis. Org Lett 2018; 20:3622-3626. [DOI: 10.1021/acs.orglett.8b01400] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qiang Liu
- Institute of Organic Chemistry, RWTH Aachen University, Aachen 52074, Germany
| | - Sun Li
- Institute of Organic Chemistry, RWTH Aachen University, Aachen 52074, Germany
| | - Xiang-Yu Chen
- Institute of Organic Chemistry, RWTH Aachen University, Aachen 52074, Germany
| | - Kari Rissanen
- Department of Chemistry, University of Jyväskylä, Jyväskylä 40014, Finland
| | - Dieter Enders
- Institute of Organic Chemistry, RWTH Aachen University, Aachen 52074, Germany
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12
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Zhang ZF, Zhang CL, Song ZY, Gao ZH, Ye S. N-Heterocyclic Carbene-Catalyzed Annulation of α-Chloroaldehydes with γ-/δ-Amino-α,β-Unsaturated Ketones: Enantioselective Synthesis of Pyrrolidones and Piperidones. Chemistry 2018; 24:8302-8305. [PMID: 29624765 DOI: 10.1002/chem.201801539] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Indexed: 11/06/2022]
Abstract
The N-heterocyclic carbene-catalyzed [2+3] and [2+4] annulations of α-chloroaldehydes with γ-/δ-amino-α,β-unsaturated ketones were developed, giving the corresponding pyrrolidones and piperidones in good yields with exclusive trans-selectivities and excellent enantioselectivities.
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Affiliation(s)
- Zhao-Fei Zhang
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Chun-Lin Zhang
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhi-Yong Song
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhong-Hua Gao
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Song Ye
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
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13
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Zhang Y, Huang J, Guo Y, Li L, Fu Z, Huang W. Access to Enantioenriched Organosilanes from Enals and β‐Silyl Enones: Carbene Organocatalysis. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201800483] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yuxia Zhang
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Jie Huang
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Yingying Guo
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Lin Li
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Zhenqian Fu
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Wei Huang
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
- Shaanxi Institute of Flexible Electronics (SIFE) Northwestern Polytechnical University (NPU) Xi'an 710072 China
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14
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Zhang Y, Huang J, Guo Y, Li L, Fu Z, Huang W. Access to Enantioenriched Organosilanes from Enals and β‐Silyl Enones: Carbene Organocatalysis. Angew Chem Int Ed Engl 2018; 57:4594-4598. [DOI: 10.1002/anie.201800483] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 02/14/2018] [Indexed: 12/13/2022]
Affiliation(s)
- Yuxia Zhang
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Jie Huang
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Yingying Guo
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Lin Li
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Zhenqian Fu
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Wei Huang
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
- Shaanxi Institute of Flexible Electronics (SIFE) Northwestern Polytechnical University (NPU) Xi'an 710072 China
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15
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Ruan S, Lin X, Xie L, Lin L, Feng X, Liu X. Asymmetric synthesis of 3-aminodihydrocoumarins via the chiral guanidine catalyzed cascade reaction of azlactones. Org Chem Front 2018. [DOI: 10.1039/c7qo00768j] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A new asymmetric preparative method of 3-aminodihydrocoumarins via reactions of azlactones and 2-nitrovinylphenols using chiral bifunctional guanidine catalysts.
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Affiliation(s)
- Sai Ruan
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
| | - Xiaobin Lin
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
| | - Lihua Xie
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
| | - Lili Lin
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
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16
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Wang Y, Wei D, Zhang W. Recent Advances on Computational Investigations ofN-Heterocyclic Carbene Catalyzed Cycloaddition/Annulation Reactions: Mechanism and Origin of Selectivities. ChemCatChem 2017. [DOI: 10.1002/cctc.201701119] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Yang Wang
- The College of Chemistry and Molecular Engineering; Zhengzhou University; 100 Science Avenue Zhengzhou Henan Province 450001 P.R. China
| | - Donghui Wei
- The College of Chemistry and Molecular Engineering; Zhengzhou University; 100 Science Avenue Zhengzhou Henan Province 450001 P.R. China
| | - Wenjing Zhang
- The College of Chemistry and Molecular Engineering; Zhengzhou University; 100 Science Avenue Zhengzhou Henan Province 450001 P.R. China
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17
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Maji B. N-Heterocyclic-Carbene-Catalyzed Reactions of Nitroalkenes: Synthesizing Important Building Blocks. ASIAN J ORG CHEM 2017. [DOI: 10.1002/ajoc.201700520] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Biswajit Maji
- Department of Chemistry; Indira Gandhi National Tribal University; Anuppur Amarkantak Madhya Pradesh 484887 India
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18
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Zhao M, Zhang YT, Chen J, Zhou L. Enantioselective Reactions Catalyzed by N-Heterocyclic Carbenes. ASIAN J ORG CHEM 2017. [DOI: 10.1002/ajoc.201700538] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ming Zhao
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science; Northwest University; Xi'an 710127 P. R. China
| | - Yu-Tong Zhang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science; Northwest University; Xi'an 710127 P. R. China
| | - Jie Chen
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science; Northwest University; Xi'an 710127 P. R. China
| | - Ling Zhou
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science; Northwest University; Xi'an 710127 P. R. China
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19
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Chanda T, Zhao JC. Recent Progress in Organocatalytic Asymmetric Domino Transformations. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201701059] [Citation(s) in RCA: 121] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Tanmoy Chanda
- Department of Chemistry University of Texas at San Antonio One UTSA Circle San Antonio TX 78249-0698 USA
| | - John C.‐G. Zhao
- Department of Chemistry University of Texas at San Antonio One UTSA Circle San Antonio TX 78249-0698 USA
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20
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Li Y, Liu T, Liang C. Mechanisms and stereoselectivities of NHC-catalyzed [4 + 2] cycloaddition reaction between phenylacetic acid and o-quinone methide: A computational investigation. MOLECULAR CATALYSIS 2017. [DOI: 10.1016/j.mcat.2017.08.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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21
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Wang W, Wei D. A DFT Study of N-Heterocyclic Carbene Catalyzed [4+2] Annulation between Saturated Carboxylate withortho-Quinone Methide: Possible Mechanisms and Origin of Enantioselectivity. ChemistrySelect 2017. [DOI: 10.1002/slct.201701679] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Wei Wang
- The College of Chemistry and Molecular Engineering; Center of Computational Chemistry; Zhengzhou University; Zhengzhou, Henan Province 450001 P. R. China
| | - Donghui Wei
- The College of Chemistry and Molecular Engineering; Center of Computational Chemistry; Zhengzhou University; Zhengzhou, Henan Province 450001 P. R. China
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22
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Yang YJ, Ji Y, Qi L, Wang G, Hui XP. Asymmetric Synthesis of Cyclopenta[3,4]pyrroloindolones via N-Heterocyclic Carbene-Catalyzed Michael/Aldol/Lactamization Cascade Reaction. Org Lett 2017; 19:3271-3274. [DOI: 10.1021/acs.orglett.7b01411] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yu-Jie Yang
- State Key Laboratory of Applied
Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Yuanyuan Ji
- State Key Laboratory of Applied
Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Liangliang Qi
- State Key Laboratory of Applied
Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Guanjun Wang
- State Key Laboratory of Applied
Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xin-Ping Hui
- State Key Laboratory of Applied
Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
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23
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Wang Y, Pan J, Dong J, Yu C, Li T, Wang XS, Shen S, Yao C. N-Heterocyclic Carbene-Catalyzed [4 + 2] Cyclization of Saturated Carboxylic Acid with o-Quinone Methides through in Situ Activation: Enantioselective Synthesis of Dihydrocoumarins. J Org Chem 2017; 82:1790-1795. [DOI: 10.1021/acs.joc.6b02444] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Yuanfeng Wang
- Jangsu
Key Laboratory of Green Synthetic Chemistry for Functional Materials,
School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou, Jiangsu 221116, P. R. China
| | - Jian Pan
- Jangsu
Key Laboratory of Green Synthetic Chemistry for Functional Materials,
School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou, Jiangsu 221116, P. R. China
| | - Jingjiao Dong
- Jangsu
Key Laboratory of Green Synthetic Chemistry for Functional Materials,
School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou, Jiangsu 221116, P. R. China
| | - Chenxia Yu
- Jangsu
Key Laboratory of Green Synthetic Chemistry for Functional Materials,
School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou, Jiangsu 221116, P. R. China
| | - Tuanjie Li
- Jangsu
Key Laboratory of Green Synthetic Chemistry for Functional Materials,
School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou, Jiangsu 221116, P. R. China
| | - Xiang-Shan Wang
- Jangsu
Key Laboratory of Green Synthetic Chemistry for Functional Materials,
School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou, Jiangsu 221116, P. R. China
| | - Shide Shen
- Xuzhou Institute of Architectural Technology, Xuzhou, Jiangsu 221116, China
| | - Changsheng Yao
- Jangsu
Key Laboratory of Green Synthetic Chemistry for Functional Materials,
School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou, Jiangsu 221116, P. R. China
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24
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Organocatalytic Friedel–Crafts Alkylation/Lactonization Reaction of Naphthols with 3‐Trifluoroethylidene Oxindoles: The Asymmetric Synthesis of Dihydrocoumarins. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201609390] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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25
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Zhao YL, Lou QX, Wang LS, Hu WH, Zhao JL. Organocatalytic Friedel-Crafts Alkylation/Lactonization Reaction of Naphthols with 3-Trifluoroethylidene Oxindoles: The Asymmetric Synthesis of Dihydrocoumarins. Angew Chem Int Ed Engl 2016; 56:338-342. [PMID: 27900837 DOI: 10.1002/anie.201609390] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2016] [Revised: 11/07/2016] [Indexed: 11/11/2022]
Abstract
Naphthols and 3-trifluoroethylidene oxindoles were found to undergo an asymmetric Friedel-Crafts alkylation/lactonization reaction, catalyzed by only 2.5 mol % of a quinine-derived squaramide catalyst, to afford the corresponding α-aryl-β-trifluoromethyl dihydrocoumarin derivatives in high yields (up to 99 %) with excellent enantio- and diastereoselectivities (up to 98 % ee, >20:1 d.r.). Importantly, the lactonization proceeded by nucleophilic attack of the naphthol hydroxy group at the amide motif of the oxindoles under mild reaction conditions. This protocol represents a new strategy for the formation of dihydrocoumarins by an efficient intramolecular amide C-N bond-cleavage and esterification process.
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Affiliation(s)
- Yun-Long Zhao
- State Key Laboratory of Respiratory Disease, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, Guangdong, 510530, China
| | - Qin-Xin Lou
- State Key Laboratory of Respiratory Disease, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, Guangdong, 510530, China
| | - Long-Sheng Wang
- Institute of POM-based Materials, School of Material and Chemical Engineering, Hubei University of Technology, Wuhan, 430068, China
| | - Wen-Hui Hu
- State Key Laboratory of Respiratory Disease, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, Guangdong, 510530, China
| | - Jun-Ling Zhao
- State Key Laboratory of Respiratory Disease, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, Guangdong, 510530, China
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26
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Wang C, Zhu S, Wang G, Li Z, Hui XP. Enantioselective Synthesis of Spiro[indoline-3,2′-pyrroles] through N-Heterocyclic-Carbene-Catalyzed Formal [3+2] Annulation. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600958] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Chengyuan Wang
- State Key Laboratory of Applied Organic Chemistry; College of Chemistry and Chemical Engineering; Lanzhou University; 730000 Lanzhou P. R. China
| | - Shiya Zhu
- State Key Laboratory of Applied Organic Chemistry; College of Chemistry and Chemical Engineering; Lanzhou University; 730000 Lanzhou P. R. China
| | - Guanjun Wang
- State Key Laboratory of Applied Organic Chemistry; College of Chemistry and Chemical Engineering; Lanzhou University; 730000 Lanzhou P. R. China
| | - Zhuopeng Li
- State Key Laboratory of Applied Organic Chemistry; College of Chemistry and Chemical Engineering; Lanzhou University; 730000 Lanzhou P. R. China
| | - Xin-Ping Hui
- State Key Laboratory of Applied Organic Chemistry; College of Chemistry and Chemical Engineering; Lanzhou University; 730000 Lanzhou P. R. China
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27
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Zheng L, Wang Y, Wei D, Qiao Y. Insights into N
-Heterocyclic Carbene-Catalyzed [4+2] Annulation Reaction of Enals with Nitroalkenes: Mechanisms, Origin of Chemo- and Stereoselectivity, and Role of Catalyst. Chem Asian J 2016; 11:3046-3054. [DOI: 10.1002/asia.201601022] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Revised: 09/02/2016] [Indexed: 01/03/2023]
Affiliation(s)
- Linjie Zheng
- The College of Chemistry and Molecular Engineering; Zhengzhou University; No. 100 Kexue Street Zhengzhou Henan 450001 P. R. China
| | - Yang Wang
- The College of Chemistry and Molecular Engineering; Zhengzhou University; No. 100 Kexue Street Zhengzhou Henan 450001 P. R. China
| | - Donghui Wei
- The College of Chemistry and Molecular Engineering; Zhengzhou University; No. 100 Kexue Street Zhengzhou Henan 450001 P. R. China
| | - Yan Qiao
- School of Basic Medical Sciences; Zhengzhou University; No. 100 Kexue Street Zhengzhou Henan 450001 P. R. China
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28
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Krishnan J, Sinu CR, Anusree M, Seetha Lakshmi KC, Mayadevi TS, Eringathodi S, Nair V. Synthesis of Cyclopentachromans byN-Heterocyclic Carbene-Mediated Homoenolate Annulation of Chroman-3-ene-4-ones. ASIAN J ORG CHEM 2016. [DOI: 10.1002/ajoc.201600074] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Jagadeesh Krishnan
- Chemical Sciences and Technology Division; National Institute for Interdisciplinary Science and Technology (CSIR-NIIST); Trivandrum 695 019 India
- Academy of Scientific and Innovative Research, New Delhi; 110001 India
| | - C. R. Sinu
- Chemical Sciences and Technology Division; National Institute for Interdisciplinary Science and Technology (CSIR-NIIST); Trivandrum 695 019 India
| | - M. Anusree
- Chemical Sciences and Technology Division; National Institute for Interdisciplinary Science and Technology (CSIR-NIIST); Trivandrum 695 019 India
| | - K. C. Seetha Lakshmi
- Chemical Sciences and Technology Division; National Institute for Interdisciplinary Science and Technology (CSIR-NIIST); Trivandrum 695 019 India
- School of Chemical Sciences; Mahatma Gandhi University; Kottayam 686560 India
| | - T. S. Mayadevi
- Chemical Sciences and Technology Division; National Institute for Interdisciplinary Science and Technology (CSIR-NIIST); Trivandrum 695 019 India
| | - Suresh Eringathodi
- Analytical Department and Centralized Instrument Facility; CSIR-CSMCRI; Bhavnagar 364 002 India
| | - Vijay Nair
- Chemical Sciences and Technology Division; National Institute for Interdisciplinary Science and Technology (CSIR-NIIST); Trivandrum 695 019 India
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29
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Affiliation(s)
- Qianfa Jia
- School of Pharmaceutical Sciences, Tsinghua University, Beijing 117543, China
| | - Jian Wang
- School of Pharmaceutical Sciences, Tsinghua University, Beijing 117543, China
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30
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Shu T, Ni Q, Song X, Zhao K, Wu T, Puttreddy R, Rissanen K, Enders D. Asymmetric synthesis of cyclopentanes bearing four contiguous stereocenters via an NHC-catalyzed Michael/Michael/esterification domino reaction. Chem Commun (Camb) 2016; 52:2609-11. [PMID: 26750327 PMCID: PMC5315016 DOI: 10.1039/c5cc09581f] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 01/05/2016] [Indexed: 11/21/2022]
Abstract
An NHC-catalyzed Michael/Michael/esterification domino reaction via homoenolate/enolate intermediates for the asymmetric synthesis of tetrasubstituted cyclopentanes bearing four contiguous stereocenters is described. A variety of α,β-unsaturated aldehydes and 2-nitroallylic acetates react well with good domino yields and high stereoselectivities.
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Affiliation(s)
- Tao Shu
- Institute of Organic Chemistry , RWTH Aachen University , Landoltweg 1 , 52074 , Aachen , Germany .
| | - Qijian Ni
- Institute of Organic Chemistry , RWTH Aachen University , Landoltweg 1 , 52074 , Aachen , Germany .
| | - Xiaoxiao Song
- Institute of Organic Chemistry , RWTH Aachen University , Landoltweg 1 , 52074 , Aachen , Germany .
| | - Kun Zhao
- Institute of Organic Chemistry , RWTH Aachen University , Landoltweg 1 , 52074 , Aachen , Germany .
| | - Tianyu Wu
- Institute of Organic Chemistry , RWTH Aachen University , Landoltweg 1 , 52074 , Aachen , Germany .
| | - Rakesh Puttreddy
- Department of Chemistry , University of Jyväskylä , 40014 Jyväskylä , Finland
| | - Kari Rissanen
- Department of Chemistry , University of Jyväskylä , 40014 Jyväskylä , Finland
| | - Dieter Enders
- Institute of Organic Chemistry , RWTH Aachen University , Landoltweg 1 , 52074 , Aachen , Germany .
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31
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Wang Y, Pan J, Jiang R, Wang Y, Zhou Z. Stereocontrolled Construction of 3,4‐Dihydrocoumarin Scaffolds with a Quaternary Amino Acid Moiety
via
Chiral Squaramide‐Catalyzed Cascade Michael Addition/Lactonization Reaction. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201500862] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yuehua Wang
- Institute and State Key Laboratory of Elemento‐Organic Chemistry, Nankai University, Tianjin 300071, People's Republic of China
- Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, People's Republic of China, Fax: (+86)‐22‐2350‐3627
| | - Jianping Pan
- Institute and State Key Laboratory of Elemento‐Organic Chemistry, Nankai University, Tianjin 300071, People's Republic of China
- Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, People's Republic of China, Fax: (+86)‐22‐2350‐3627
| | - Rongrong Jiang
- Institute and State Key Laboratory of Elemento‐Organic Chemistry, Nankai University, Tianjin 300071, People's Republic of China
- Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, People's Republic of China, Fax: (+86)‐22‐2350‐3627
| | - Youming Wang
- Institute and State Key Laboratory of Elemento‐Organic Chemistry, Nankai University, Tianjin 300071, People's Republic of China
- Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, People's Republic of China, Fax: (+86)‐22‐2350‐3627
| | - Zhenghong Zhou
- Institute and State Key Laboratory of Elemento‐Organic Chemistry, Nankai University, Tianjin 300071, People's Republic of China
- Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, People's Republic of China, Fax: (+86)‐22‐2350‐3627
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32
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Li F, Zhao C, Wang J. N-Heterocyclic carbene catalyzed dehydrogenative coupling of enals: synthesis of monobactams. Org Chem Front 2016. [DOI: 10.1039/c5qo00372e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The novel NHC-catalyzed dehydrogenative coupling of enals is described to generate a wide range of monobactams.
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Affiliation(s)
- Fangyi Li
- Department of Pharmacology and Pharmaceutical Sciences
- School of Medicine
- Tsinghua University
- Beijing
- China
| | - Changgui Zhao
- Department of Pharmacology and Pharmaceutical Sciences
- School of Medicine
- Tsinghua University
- Beijing
- China
| | - Jian Wang
- Department of Pharmacology and Pharmaceutical Sciences
- School of Medicine
- Tsinghua University
- Beijing
- China
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33
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Fu Z, Wu X, Chi YR. Rapid access to bicyclic δ-lactones via carbene-catalyzed activation and cascade reaction of unsaturated carboxylic esters. Org Chem Front 2016. [DOI: 10.1039/c5qo00348b] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The carbene-catalyzed activation of α,β-unsaturated ester initiates a well-controlled cascade process for access to iridoid-type multi-cyclic lactones with high stereo-selectivities.
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Affiliation(s)
- Zhenqian Fu
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
- Singapore
| | - Xingxing Wu
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
- Singapore
| | - Yonggui Robin Chi
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
- Singapore
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34
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Zhao C, Li F, Wang J. N-Heterocyclic Carbene Catalyzed Dynamic Kinetic Resolution of Pyranones. Angew Chem Int Ed Engl 2015; 55:1820-4. [PMID: 26546390 DOI: 10.1002/anie.201508205] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 10/13/2015] [Indexed: 11/06/2022]
Abstract
The dynamic kinetic resolution of 6-hydroxypyranones with enals or alkynals through an asymmetric redox esterification is catalyzed by a chiral N-heterocyclic carbene. The resulting esters are obtained in good to high yields and with high levels of enantio- and diastereocontrol. The reaction products are further derivatized to obtain functionalized sugar derivatives and natural products.
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Affiliation(s)
- Changgui Zhao
- Department of Pharmacology and Pharmaceutical Sciences, School of Medicine, Tsinghua University, Beijing, 100084, China.,Tsinghua-Peking Centre for Life Sciences, Beijing, 100084, China
| | - Fangyi Li
- Department of Pharmacology and Pharmaceutical Sciences, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Jian Wang
- Department of Pharmacology and Pharmaceutical Sciences, School of Medicine, Tsinghua University, Beijing, 100084, China. .,Tsinghua-Peking Centre for Life Sciences, Beijing, 100084, China.
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35
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Zhao C, Li F, Wang J. N-Heterocyclic Carbene Catalyzed Dynamic Kinetic Resolution of Pyranones. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201508205] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Changgui Zhao
- Department of Pharmacology and Pharmaceutical Sciences; School of Medicine; Tsinghua University; Beijing 100084 China
- Tsinghua-Peking Centre for Life Sciences; Beijing 100084 China
| | - Fangyi Li
- Department of Pharmacology and Pharmaceutical Sciences; School of Medicine; Tsinghua University; Beijing 100084 China
| | - Jian Wang
- Department of Pharmacology and Pharmaceutical Sciences; School of Medicine; Tsinghua University; Beijing 100084 China
- Tsinghua-Peking Centre for Life Sciences; Beijing 100084 China
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