1
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Lei S, Wang H, Wang SR. Catalytic Intramolecular Ketone Haloacylation Enabled Stereoselective Heterolytic Cleavage of Cyclopropyl Ketones with Enhanced Reactivity and Regioselectivity beyond Electronics. Org Lett 2024; 26:4111-4116. [PMID: 38717836 DOI: 10.1021/acs.orglett.4c01241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
By integration of oxocarbenium activation and Lewis acid coordination activation via conformational proximity-driven, Pd(II)- or Cu(I)-catalyzed intramolecular ketone haloacylation, regio- and stereoselective heterolytic ring-opening 1,5-haloacylation of cyclopropyl ketones, including those with weak single alkyl donors, has been developed for the synthesis of valuable α-quaternary halo-γ-butenolides. The vicinal carboxylic acid and ketone acceptors are no longer just spectator activators. Further, this reaction delivers a constant regioselectivity regardless of the electronic nature of substituents, even the malonate.
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2
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Hussain A, Peraka S, Ramachary DB. Organocatalytic Reductive Amination of the Chiral Formylcyclopropanes: Scope and Applications. J Org Chem 2023; 88:16047-16064. [PMID: 37948127 DOI: 10.1021/acs.joc.3c01074] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2023]
Abstract
We developed a sustainable three-component reductive amination protocol for the chemoselective coupling of optically active functionally rich donor-acceptor carbonyl-cyclopropanes with various amines under 10 mol % of diphenyl phosphate in the presence of Hantzsch ester as a hydride source. The catalytic selective reductive C-N coupling has wide advantages like no epimerization, no ring opening, large substrate scope, generating only mono N-alkylation products and simultaneously resulting in chiral cyclopropane-containing amines possessing many applications in the medicinal chemistry. In this article, we have shown the synthetic applications of reductive C-N coupling reaction to make chiral α-carbonyl-cyclopropane containing amines 8, double C-N coupled cyclopropane-amines 10, unusual C-N/C-C coupled cyclopropane-amines 12, chiral tert-butylsulfinamide containing cyclopropanes 14/15, and functionally rich chiral cyclopropane-fused N-heterocycles 16/18/19. Many of these chiral cyclopropane-amines 5-19 can serve as building blocks for the synthesis of drug-like small molecules, natural products, pharmaceuticals, and their analogues.
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Affiliation(s)
- Akram Hussain
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - Swamy Peraka
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
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3
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Nong Y, Pang C, Teng K, Zhang S, Liu Q. NHC-Catalyzed Chemoselective Reactions of Enals and Cyclopropylcarbaldehydes for Access to Chiral Dihydropyranone Derivatives. J Org Chem 2023; 88:13535-13543. [PMID: 37682310 DOI: 10.1021/acs.joc.3c01171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/09/2023]
Abstract
An N-heterocyclic carbene (NHC)-catalyzed chemoselective activation reaction of 1-cyclopropylcarbaldehydes and α-alkynyl enals is reported. NHC selectively catalyzes 1-cyclopropylaldehydes, followed by a [2 + 4] cycloaddition reaction with α-alkynyl enals. The target dihydropyranone derivatives bearing different substituents and substitution patterns can be obtained in good to excellent yields with excellent enantio- and diastereoselectivities under mild conditions.
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Affiliation(s)
- Yingling Nong
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang 550025, China
| | - Chen Pang
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang 550025, China
| | - Kunpeng Teng
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang 550025, China
| | - Sheng Zhang
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang 550025, China
| | - Qian Liu
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang 550025, China
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4
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Xu X, Shao J, Wang SR. Tuning the Cyclopropane Ring-Opening Reaction over Electronic Bias by Fusion to a Pre-Aromatic Ring: TfOH-Promoted Aromatization of Dibenzonorcaradienes to Dibenzo[ f, h]isocoumarins. J Org Chem 2022; 87:3794-3798. [PMID: 35037754 DOI: 10.1021/acs.joc.1c02884] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Fusion of the cyclopropane ring bearing two vicinal acceptors to the pre-aromatic dihydrophenanthrene ring, which is constructed by the Pd-catalyzed cross-coupling between the vicinal aromatic rings, is found to effectively direct the cleavage of the electronically unfavored cyclopropane bond between the vicinal acceptors. Consequently, a modular method for the rapid synthesis of dibenzo[f,h]isocoumarins from methyl ketones, aryl aldehydes, and α-keto esters via a reaction cascade of aldol condensation, Kukhtin-Ramirez cyclopropanation, Pd-catalyzed direct arylation, and acid-promoted aromatization has been realized.
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Affiliation(s)
- Xudong Xu
- Chang-Kung Chuang Institute, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Lu, Shanghai 200241, China
| | - Jiru Shao
- Chang-Kung Chuang Institute, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Lu, Shanghai 200241, China
| | - Sunewang R Wang
- Chang-Kung Chuang Institute, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Lu, Shanghai 200241, China.,Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, East China Normal University, 3663 North Zhongshan Lu, Shanghai 200062, China
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5
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Džambaski Z, Bondžić AM, Triandafillidi I, Kokotos CG, Bondžić BP. Organocatalytic, Organic Oxidant Promoted, Enamine C−H Oxidation/Cyclopropanation Reaction. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100630] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Zdravko Džambaski
- University of Belgrade-Institute of Chemistry Technology and Metallurgy Department of Chemistry Njegoševa 12 11000 Belgrade, Republic of Serbia
| | - Aleksandra M. Bondžić
- Vinča Institute of Nuclear Sciences National Institute of the Republic of Serbia University of Belgrade P.O. Box 522 11000 Belgrade Serbia
| | - Ierasia Triandafillidi
- Laboratory of Organic Chemistry Department of Chemistry National and Kapodistrian University of Athens Panepistimiopolis 15771 Athens Greece
| | - Christoforos G. Kokotos
- Laboratory of Organic Chemistry Department of Chemistry National and Kapodistrian University of Athens Panepistimiopolis 15771 Athens Greece
| | - Bojan P. Bondžić
- University of Belgrade-Institute of Chemistry Technology and Metallurgy Department of Chemistry Njegoševa 12 11000 Belgrade, Republic of Serbia
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6
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Carbene-catalyzed activation of cyclopropylcarbaldehydes for mannich reaction and δ-lactam formation: remote enantioselecitvity control and dynamic kinetic asymmetric transformation. Sci China Chem 2021. [DOI: 10.1007/s11426-021-9989-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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7
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8
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Shao J, Luo Q, Bi H, Wang SR. Cooperation of Cis Vicinal Acceptors for Donor-Acceptor Cyclopropane Activation: TfOH-Promoted Ring-Opening/Aryl Shift Rearrangement to 3- and 5-Ylidenebutenolides. Org Lett 2021; 23:459-463. [PMID: 33399000 DOI: 10.1021/acs.orglett.0c03976] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A convenient route to 3- and 5-ylidenebutenolides from readily available cis-2-acylcyclopropane-1-carboxylates is described. Upon exposure to TfOH, synergistic activation of the vicinal acceptors in cis-2-acylcyclopropane-1-carboxylates generates highly strained bicyclic oxocarbenium ion intermediates, which undergo the ring-opening/aryl shift/deprotonation cascade process to form the 3- or 5-ylidenebutenolides depending on the acyl group. On the other hand, the corresponding trans isomers, from which it is difficult to form such oxocarbenium ions, are inactive under the same conditions.
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Affiliation(s)
- Jiru Shao
- Chang-Kung Chuang Institute, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Lu, Shanghai 200241, China
| | - Qinyuan Luo
- Chang-Kung Chuang Institute, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Lu, Shanghai 200241, China
| | - Hongyan Bi
- Chang-Kung Chuang Institute, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Lu, Shanghai 200241, China
| | - Sunewang R Wang
- Chang-Kung Chuang Institute, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Lu, Shanghai 200241, China.,Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, East China Normal University, 3663 North Zhongshan Lu, Shanghai 200062, China
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9
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Nie G, Huang X, Wang Z, Pan D, Zhang J, Chi YR. Umpolung of donor–acceptor cyclopropanes via N-heterocyclic carbene organic catalysis. Org Chem Front 2021. [DOI: 10.1039/d1qo00826a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A carbene-catalyzed formal umpolung of donor–acceptor (D–A) cyclopropanes is disclosed with chiral spirocyclic lactones bearing multiple functional groups afforded with excellent enantio- and diastereoselectivities.
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Affiliation(s)
- Guihua Nie
- 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 550025, China
| | - Xuan Huang
- International Joint Research Center for Molecular Science, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Zhongyao 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 550025, China
| | - Dingwu Pan
- 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 550025, China
| | - Junmin Zhang
- International Joint Research Center for Molecular Science, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, 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 550025, China
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
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10
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Wang Y, Qiao Y, Lan Y, Wei D. Predicting the origin of selectivity in NHC-catalyzed ring opening of formylcyclopropane: a theoretical investigation. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01768j] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Using density functional theory, we investigated the origin of selectivity in the N-heterocyclic carbene (NHC)-catalyzed transformation of formylcyclopropane with an alkylidene oxindole.
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Affiliation(s)
- Yang Wang
- Department of Material and Chemical Engineering
- Zhengzhou University of Light Industry
- Zhengzhou
- P.R. China
| | - Yan Qiao
- Department of Pathophysiology
- School of Basic Medical Sciences
- Zhengzhou University
- Zhengzhou
- P.R. China
| | - Yu Lan
- College of Chemistry
- Zhengzhou University
- Zhengzhou
- P.R. China
| | - Donghui Wei
- College of Chemistry
- Zhengzhou University
- Zhengzhou
- P.R. China
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11
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Kouda R, Yakushiji F. Recent Advances in Iridoid Chemistry: Biosynthesis and Chemical Synthesis. Chem Asian J 2020; 15:3771-3783. [PMID: 33016562 DOI: 10.1002/asia.202001034] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 09/30/2020] [Indexed: 01/11/2023]
Abstract
Iridoids are a large family of monoterpenoids found in traditional medicinal plants and show significant effects for the human species. In addition to their wide range of biological activities, such as neuroprotective and antitumor activities, the cis-fused bicyclic ring systems of iridoids are still attractive as synthetic targets to apply novel synthetic methodologies. Accordingly, recent progress regarding the biosynthesis and chemical synthesis of iridoids is covered in this minireview. Identification of new enzymes for the iridoid biosynthesis in Catharanthus roseus and ingenious synthetic strategies for the construction of the iridoid skeleton are described.
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Affiliation(s)
- Ryuji Kouda
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, 060-0812, Japan
| | - Fumika Yakushiji
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, 060-0812, Japan.,Center for Research and Education on Drug Discovery, Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, 060-0812, Japan
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12
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Recent advances in the catalytic fixation of carbon dioxide to value-added chemicals over alkali metal salts. J CO2 UTIL 2020. [DOI: 10.1016/j.jcou.2020.101252] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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13
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Zhu X, Pan D, Mou C, Zhou B, Pan L, Jin Z. Green and Facile Synthesis of Spirocyclopentanes Through NaOH-Promoted Chemo- and Diastereo-Selective (3 + 2) Cycloaddition Reactions of Activated Cyclopropanes and Enamides. Front Chem 2020; 8:542. [PMID: 32676495 PMCID: PMC7333539 DOI: 10.3389/fchem.2020.00542] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 05/26/2020] [Indexed: 01/13/2023] Open
Abstract
A chemo- and diastereo-selective (3 + 2) cycloaddition reacition between Donor-Acceptor (D-A) cyclopropanes and α,β-unsaturated enamides is developed for efficient access to spiro(cyclopentane-1,3'-indoline) derivatives. Simple, inexpensive and readily available NaOH is used as the sole catalyst for this process. A broad range of D-A cyclopropanes could be used as the C-3 synthons to react with oxindole-derived α,β-unsaturated enamides. The structurally sophisticated spiro(cyclopentane-1,3'-indoline) derivatives bearing up to 3 adjacent chiral centers are afforded in excellent yields as single diastereomers.
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Affiliation(s)
- Xun Zhu
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of Education, Guizhou University, Guiyang, China
| | - Dingwu Pan
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of Education, Guizhou University, Guiyang, China
| | - Chengli Mou
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Bo Zhou
- R&D Center, Shenzhen AmTech Bioengineering Ltd., Inc., Shenzhen, China
| | - Lutai Pan
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang, 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, Guiyang, China
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14
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Dai L, Ye S. Photo/N-Heterocyclic Carbene Co-catalyzed Ring Opening and γ-Alkylation of Cyclopropane Enal. Org Lett 2020; 22:986-990. [PMID: 31951136 DOI: 10.1021/acs.orglett.9b04533] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An unprecedented photo/NHC-co-catalyzed ring-opening C-C bond cleavage of cyclopropane enal and the following γ-alkylation with a halogenated compound via radicals were established, affording the corresponding γ-alkylated α,β-unsaturated esters in moderate to good yields.
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Affiliation(s)
- Lei Dai
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, CAS Research/Education Center for Excellence in Molecular Sciences , 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, CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , China.,University of Chinese Academy of Sciences , Beijing 100049 , China
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15
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Ma JT, Cheng Y. Construction of enantiopure imine bridged benzo[c]azepinones by a silver(i) and chiral N-heterocyclic carbene multicatalytic reaction sequence of N′-(2-alkynylbenzylidene)hydrazides and cyclopropanecarbaldehydes. Org Chem Front 2020. [DOI: 10.1039/d0qo00877j] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel and efficient method for the synthesis of enantiopure bridged benzo[c]azepinone compounds has been developed by metal/N-heterocyclic carbene multicatalysis.
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Affiliation(s)
- Jin-Tao Ma
- College of Chemistry
- Beijing Normal University
- Beijing 100875
- China
| | - Ying Cheng
- College of Chemistry
- Beijing Normal University
- Beijing 100875
- China
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16
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Unravelling the Mechanism and Selectivity of the NHC‐catalyzed Three‐Membered Ring‐Opening/Fluorination of Epoxy Enals: A DFT Study. ChemCatChem 2019. [DOI: 10.1002/cctc.201900424] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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17
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Xian J, Chen L, Ye L, Sun Y, Shi Z, Zhao Z, Li X. Enantioselective synthesis of fused dihydropyranones via squaramide-catalyzed Michael addition/lactonization cascade reaction. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.03.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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18
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Xia F, Chen XY, Ye S. [3 + 4] Annulation of Bromoenals and 1,2-Benzenedithiol: Base-Promoted [2 + 4] Reaction and N-Heterocyclic Carbene-Catalyzed Ring-Expansion. J Org Chem 2018; 83:15178-15185. [PMID: 30468071 DOI: 10.1021/acs.joc.8b02460] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The [3 + 4] and [2 + 4] annulations of bromoenals and 1,2-benzenedithiol were developed in the presence or absence of N-heterocyclic carbene, respectively. Control experiment and kinetic investigation revealed the [3 + 4] annulation involves the base-promoted [2 + 4] annulation and the following carbene-catalyzed ring-expansion.
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Affiliation(s)
- Fei Xia
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , China.,University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Xiang-Yu Chen
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , China
| | - Song Ye
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , China.,University of Chinese Academy of Sciences , Beijing 100049 , China
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19
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Peraka S, Hussain A, Ramachary DB. Modular Access to Chiral 2,3-Dihydrofurans and 3,4-Dihydro-2H-pyrans by Stereospecific Activation of Formylcyclopropanes through Combination of Organocatalytic Reductive Coupling and Lewis-Acid-Catalyzed Annulative Ring-Opening Reactions. J Org Chem 2018; 83:9795-9817. [DOI: 10.1021/acs.joc.8b01315] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Swamy Peraka
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - Akram Hussain
- Catalysis Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
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20
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Rout S, Das A, Singh VK. Metal-Controlled Switching of Enantioselectivity in the Mukaiyama–Michael Reaction of α,β-Unsaturated 2-Acyl Imidazoles Catalyzed by Chiral Metal–Pybox Complexes. J Org Chem 2018; 83:5058-5071. [DOI: 10.1021/acs.joc.8b00399] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Subhrajit Rout
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India
| | - Arko Das
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India
| | - Vinod K. Singh
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal, Madhya Pradesh 462066, India
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21
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Xu LC, Zhou P, Li JZ, Hao WJ, Tu SJ, Jiang B. Thiazolium salt-catalyzed [3 + 2 + 1] cyclization for the synthesis of trisubstituted 2-pyrones using arylglyoxals as a carbonyl source. Org Chem Front 2018. [DOI: 10.1039/c7qo00899f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new thiazolium salt-catalyzed [3 + 2 + 1] cyclization of acetylenedicarboxylates with arylglyoxals has been developed, enabling organocatalytic umpolung to access trisubstituted 2-pyrones with good yields via C–C bond cleavage.
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Affiliation(s)
- Li-Chen Xu
- School of Chemistry & Materials Science
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
| | - Peng Zhou
- School of Chemistry & Materials Science
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
| | - Jia-Zhuo Li
- School of Chemistry & Materials Science
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
| | - Wen-Juan Hao
- School of Chemistry & Materials Science
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
| | - Shu-Jiang Tu
- School of Chemistry & Materials Science
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
| | - Bo Jiang
- School of Chemistry & Materials Science
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
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22
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Theoretical study on DABCO-catalyzed ring expansion of cyclopropyl ketone: Mechanism, chemoselectivity, and role of catalyst. COMPUT THEOR CHEM 2018. [DOI: 10.1016/j.comptc.2017.11.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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23
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Fuchs PJW, Zeitler K. An N-Heterocyclic Carbene-Mediated, Enantioselective and Multicatalytic Strategy to Access Dihydropyranones in a Sequential Three-Component One-Pot Reaction. Org Lett 2017; 19:6076-6079. [DOI: 10.1021/acs.orglett.7b02889] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Patrick J. W. Fuchs
- Institut für Organische
Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| | - Kirsten Zeitler
- Institut für Organische
Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
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24
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Selvi S, Srinivasan K. Tandem Ring Opening/Cyclization of trans
-2-Aryl-3-nitrocyclopropane-1,1-dicarboxylates with 2-Aminopyridines: Access to Pyrido[1,2-a
]pyrimidin-4-one Derivatives. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700765] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Subramani Selvi
- School of Chemistry; Bharathidasan University; 620024 Tiruchirappalli Tamil Nadu India
| | - Kannupal Srinivasan
- School of Chemistry; Bharathidasan University; 620024 Tiruchirappalli Tamil Nadu India
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25
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Zhang J, Tang Y, Wei W, Wu Y, Li Y, Zhang J, Zheng Y, Xu S. Organocatalytic Cloke–Wilson Rearrangement: DABCO-Catalyzed Ring Expansion of Cyclopropyl Ketones to 2,3-Dihydrofurans. Org Lett 2017; 19:3043-3046. [DOI: 10.1021/acs.orglett.7b00805] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Jingfang Zhang
- Department of Chemistry,
School of Science, Xi’an Jiaotong University, Xi’an 710049, P. R. China
| | - Yuhai Tang
- Department of Chemistry,
School of Science, Xi’an Jiaotong University, Xi’an 710049, P. R. China
| | - Wen Wei
- Department of Chemistry,
School of Science, Xi’an Jiaotong University, Xi’an 710049, P. R. China
| | - Yong Wu
- Department of Chemistry,
School of Science, Xi’an Jiaotong University, Xi’an 710049, P. R. China
| | - Yang Li
- Department of Chemistry,
School of Science, Xi’an Jiaotong University, Xi’an 710049, P. R. China
| | - Junjie Zhang
- Department of Chemistry,
School of Science, Xi’an Jiaotong University, Xi’an 710049, P. R. China
| | - Yuansuo Zheng
- Department of Chemistry,
School of Science, Xi’an Jiaotong University, Xi’an 710049, P. R. China
| | - Silong Xu
- Department of Chemistry,
School of Science, Xi’an Jiaotong University, Xi’an 710049, P. R. China
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26
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Prieto L, Sánchez-Díez E, Uria U, Reyes E, Carrillo L, Vicario JL. Catalytic Generation of Donor-Acceptor Cyclopropanes under N
-Heterocyclic Carbene Activation and their Stereoselective Reaction with Alkylideneoxindoles. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700198] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Liher Prieto
- Department of Organic Chemistry II; University of the Basque Country (UPV/EHU).; P. O. Box 644 48080 Bilbao Spain
| | - Eduardo Sánchez-Díez
- Department of Organic Chemistry II; University of the Basque Country (UPV/EHU).; P. O. Box 644 48080 Bilbao Spain
| | - Uxue Uria
- Department of Organic Chemistry II; University of the Basque Country (UPV/EHU).; P. O. Box 644 48080 Bilbao Spain
| | - Efraím Reyes
- Department of Organic Chemistry II; University of the Basque Country (UPV/EHU).; P. O. Box 644 48080 Bilbao Spain
| | - Luisa Carrillo
- Department of Organic Chemistry II; University of the Basque Country (UPV/EHU).; P. O. Box 644 48080 Bilbao Spain
| | - Jose L. Vicario
- Department of Organic Chemistry II; University of the Basque Country (UPV/EHU).; P. O. Box 644 48080 Bilbao Spain
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27
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Xu X, Wang Y, Cui X, Wojtas L, Zhang XP. Metalloradical activation of α-formyldiazoacetates for the catalytic asymmetric radical cyclopropanation of alkenes. Chem Sci 2017; 8:4347-4351. [PMID: 28959396 PMCID: PMC5605771 DOI: 10.1039/c7sc00658f] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Accepted: 03/27/2017] [Indexed: 11/21/2022] Open
Abstract
For the first time, α-formyldiazoacetates have been successfully applied for the asymmetric cyclopropanation of alkenes via Co(ii)-based metalloradical catalysis. The cobalt(ii) complex of the D2-symmetric chiral amidoporphyrin [Co(3,5-Di t Bu-ChenPhyrin)] is an effective metalloradical catalyst that can activate α-formyldiazoacetates to cyclopropanate both aromatic and aliphatic olefins with varied electronic properties, affording the synthetically useful 1,1-cyclopropaneformylesters in high yields with both high diastereo- and enantioselectivity.
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Affiliation(s)
- Xue Xu
- Department of Chemistry , University of South Florida , Tampa , FL 33620 , USA
| | - Yong Wang
- Department of Chemistry , Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , USA .
| | - Xin Cui
- Department of Chemistry , University of South Florida , Tampa , FL 33620 , USA
| | - Lukasz Wojtas
- Department of Chemistry , University of South Florida , Tampa , FL 33620 , USA
| | - X Peter Zhang
- Department of Chemistry , Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , USA . .,Department of Chemistry , University of South Florida , Tampa , FL 33620 , USA
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28
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Enantioselective NHC-catalysed redox [4+2]-hetero-Diels-Alder reactions using α-aroyloxyaldehydes and unsaturated ketoesters. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.tetasy.2017.01.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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29
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Zhang ML, Wu ZJ, Zhao JQ, Luo Y, Xu XY, Zhang XM, Yuan WC. Michael Addition–Lactonization of Arylacetyl Phosphonate to β,γ-Unsaturated α-Keto Esters for the Synthesis of Chiral syn-3,4-Dihydropyranones and 5,6-Dihydropyranones. Org Lett 2016; 18:5110-5113. [DOI: 10.1021/acs.orglett.6b02558] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Ming-Liang Zhang
- University of Chinese Academy of Sciences, Beijing 100049, China
| | | | - Jian-Qiang Zhao
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yuan Luo
- University of Chinese Academy of Sciences, Beijing 100049, China
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30
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Sanchez-Diez E, Vesga DL, Reyes E, Uria U, Carrillo L, Vicario JL. Organocatalytically Generated Donor–Acceptor Cyclopropanes in Domino Reactions. One-Step Enantioselective Synthesis of Pyrrolo[1,2-a]quinolines. Org Lett 2016; 18:1270-3. [DOI: 10.1021/acs.orglett.6b00173] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eduardo Sanchez-Diez
- Departamento
de Química
Orgánica II, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), P.O. Box 644, E-48080 Bilbao, Spain
| | - Diana L. Vesga
- Departamento
de Química
Orgánica II, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), P.O. Box 644, E-48080 Bilbao, Spain
| | - Efraim Reyes
- Departamento
de Química
Orgánica II, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), P.O. Box 644, E-48080 Bilbao, Spain
| | - Uxue Uria
- Departamento
de Química
Orgánica II, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), P.O. Box 644, E-48080 Bilbao, Spain
| | - Luisa Carrillo
- Departamento
de Química
Orgánica II, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), P.O. Box 644, E-48080 Bilbao, Spain
| | - Jose L. Vicario
- Departamento
de Química
Orgánica II, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), P.O. Box 644, E-48080 Bilbao, Spain
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31
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Selvi T, Srinivasan K. Synthetic Applications of Aroyl- and Nitro-substituted 2-Aryl-Cyclopropane-1,1-Dicarboxylates. Isr J Chem 2016. [DOI: 10.1002/ijch.201500093] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Thangavel Selvi
- School of Chemistry; Bharathidasan University; Tiruchirappalli 620 024 Tamil Nadu India
| | - Kannupal Srinivasan
- School of Chemistry; Bharathidasan University; Tiruchirappalli 620 024 Tamil Nadu India
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32
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Attaba N, Taylor JE, Slawin AMZ, Smith AD. Enantioselective NHC-Catalyzed Redox [4 + 2]-Hetero-Diels–Alder Reactions Using α,β-Unsaturated Trichloromethyl Ketones as Amide Equivalents. J Org Chem 2015; 80:9728-39. [DOI: 10.1021/acs.joc.5b01820] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Nassilia Attaba
- EaStCHEM,
School of Chemistry, University of St Andrews, North Haugh, St Andrews, KY16 9ST, U.K
| | - James E. Taylor
- EaStCHEM,
School of Chemistry, University of St Andrews, North Haugh, St Andrews, KY16 9ST, U.K
| | - Alexandra M. Z. Slawin
- EaStCHEM,
School of Chemistry, University of St Andrews, North Haugh, St Andrews, KY16 9ST, U.K
| | - Andrew D. Smith
- EaStCHEM,
School of Chemistry, University of St Andrews, North Haugh, St Andrews, KY16 9ST, U.K
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33
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Luo HX, Niu YH, Cao XP, Ye XS. Cyclopropenes for the Synthesis of Cyclopropane-Fused Dihydroquinolines and Benzazepines. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500203] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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34
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Selvi T, Srinivasan K. Boron Trifluoride-Promoted Indium(III) Triflate-Catalyzed Sequential One-Pot Synthesis of (1,2-Diaryl-2-oxoethyl)malonates fromtrans-2-Aryl-3-nitrocyclopropane-1,1-dicarboxylates and Activated Arenes. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500143] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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35
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Wang L, Ni Q, Blümel M, Shu T, Raabe G, Enders D. NHC-Catalyzed Asymmetric Synthesis of Functionalized Succinimides from Enals and α-Ketoamides. Chemistry 2015; 21:8033-7. [PMID: 25877658 PMCID: PMC4648042 DOI: 10.1002/chem.201500661] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Indexed: 11/21/2022]
Abstract
The efficient asymmetric synthesis of highly substituted succinimides from α,β-unsaturated aldehydes and α-ketoamides via NHC-catalyzed [3+2] cycloaddition has been developed. The new scalable protocol significantly expands the utility of NHC catalysis for the synthesis of heterocycles and provides easy access to assemble a wide range of succinimides from simple starting materials.
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Affiliation(s)
- Lei Wang
- Institute of Organic Chemistry, RWTH Aachen UniversityLandoltweg 1, 52074 Aachen (Germany) E-mail:
| | - Qijian Ni
- Institute of Organic Chemistry, RWTH Aachen UniversityLandoltweg 1, 52074 Aachen (Germany) E-mail:
| | - Marcus Blümel
- Institute of Organic Chemistry, RWTH Aachen UniversityLandoltweg 1, 52074 Aachen (Germany) E-mail:
| | - Tao Shu
- Institute of Organic Chemistry, RWTH Aachen UniversityLandoltweg 1, 52074 Aachen (Germany) E-mail:
| | - Gerhard Raabe
- Institute of Organic Chemistry, RWTH Aachen UniversityLandoltweg 1, 52074 Aachen (Germany) E-mail:
| | - Dieter Enders
- Institute of Organic Chemistry, RWTH Aachen UniversityLandoltweg 1, 52074 Aachen (Germany) E-mail:
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36
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Halskov KS, Kniep F, Lauridsen VH, Iversen EH, Donslund BS, Jørgensen KA. Organocatalytic enamine-activation of cyclopropanes for highly stereoselective formation of cyclobutanes. J Am Chem Soc 2015; 137:1685-91. [PMID: 25575040 DOI: 10.1021/ja512573q] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A novel organocatalytic activation mode of cyclopropanes is presented. The reaction concept is based on a design in which a reactive donor-acceptor cyclopropane intermediate is generated by in situ condensation of cyclopropylacetaldehydes with an aminocatalyst. The mechanism of this enamine-based activation of cyclopropylacetaldehydes is investigated by the application of a combined computational and experimental approach. The activation can be traced to a favorable orbital interaction between the π-orbital of the enamine and the σ*C-C orbital of the cyclopropyl ring. Furthermore, the synthetic potential of the developed system has been evaluated. By the application of a chiral secondary amine catalyst, the organocatalytically activated cyclopropanes show an unexpected and highly stereoselective formation of cyclobutanes, functionalizing at the usually inert sites of the donor-acceptor cyclopropane. By the application of 3-olefinic oxindoles and benzofuranone, biologically relevant spirocyclobutaneoxindoles and spirocyclobutanebenzofuranone can be obtained in good yields, high diastereomeric ratios, and excellent enantiomeric excesses. The mechanism of the reaction is discussed and two mechanistic proposals are presented.
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Affiliation(s)
- Kim Søholm Halskov
- Center for Catalysis, Department of Chemistry, Aarhus University , DK-8000 Aarhus C, Denmark
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37
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Selvi T, Vanmathi G, Srinivasan K. Synthesis of 2,3-disubstituted thiophenes from 2-aryl-3-nitro-cyclopropane-1,1-dicarboxylates and 1,4-dithiane-2,5-diol. RSC Adv 2015. [DOI: 10.1039/c5ra09111j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
A two-step synthesis of 2,3-disubstituted thiophenes from trans-2-aryl-3-nitrocyclopropane-1,1-dicarboxylates and 1,4-dithiane-2,5-diol is described.
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Affiliation(s)
- Thangavel Selvi
- School of Chemistry
- Bharathidasan University
- Tiruchirappalli 620 024
- India
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38
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Gaggero N, Albanese DC, Nava D. A new approach to 4,6-disubstituted-3,4-dihydropyran-2-ones by Domino Michael addition-cyclization reaction under PTC conditions. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.09.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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39
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Selvi T, Srinivasan K. Synthesis of 2,4,5-trisubstituted oxazoles through tin(iv) chloride-mediated reaction of trans-2-aryl-3-nitro-cyclopropane-1,1-dicarboxylates with nitriles. Chem Commun (Camb) 2014; 50:10845-8. [DOI: 10.1039/c4cc04764h] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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40
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Albanese DCM, Gaggero N. N-Heterocyclic Carbene Catalysis as a Tool for Gaining Access to the 3,4-Dihydropyran-2-one Skeleton. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402024] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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41
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42
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43
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Sathishkannan G, Srinivasan K. Lewis Acid-Mediated Transformations oftrans-2-Aroyl-3-aryl- cyclopropane-1,1-dicarboxylates into 2-Pyrones and 1-Indanones. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201300861] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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44
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Cavitt MA, Phun LH, France S. Intramolecular donor–acceptor cyclopropane ring-opening cyclizations. Chem Soc Rev 2014; 43:804-18. [DOI: 10.1039/c3cs60238a] [Citation(s) in RCA: 559] [Impact Index Per Article: 55.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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45
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Wang LF, Shi ZF, Cao XP, Li BS, An P. Construction of fused- and spiro-oxa-[n.2.1] skeletons by a tandem epoxide rearrangement/intramolecular [3+2] cycloaddition of cyclopropanes with carbonyls. Chem Commun (Camb) 2014; 50:8061-4. [DOI: 10.1039/c4cc02641a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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46
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He L, Zhang J, Fan YC, Du GF, Zhang J, Dai B. N-heterocyclic carbenes mediated cyano-phosphorylation of ketones. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.08.073] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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47
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Akagawa K, Takigawa S, Nagamine IS, Umezawa R, Kudo K. Peptide-Catalyzed Diastereo- and Enantioselective Cyclopropanation of Aromatic α,β-Unsaturated Aldehydes. Org Lett 2013; 15:4964-7. [DOI: 10.1021/ol402227y] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Kengo Akagawa
- Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Shota Takigawa
- Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Iman Sho Nagamine
- Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Ryota Umezawa
- Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Kazuaki Kudo
- Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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48
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Song X, Ni Q, Grossmann A, Enders D. N-Heterocyclic-Carbene-Catalyzed One-Pot Synthesis of Hydroxamic Esters. Chem Asian J 2013; 8:2965-9. [DOI: 10.1002/asia.201300938] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Indexed: 11/11/2022]
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49
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Davies AT, Taylor JE, Douglas J, Collett CJ, Morrill LC, Fallan C, Slawin AMZ, Churchill G, Smith AD. Stereospecific Asymmetric N-Heterocyclic Carbene (NHC)-Catalyzed Redox Synthesis of Trifluoromethyl Dihydropyranones and Mechanistic Insights. J Org Chem 2013; 78:9243-57. [DOI: 10.1021/jo401433q] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Alyn T. Davies
- EaStCHEM,
School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, United Kingdom
| | - James E. Taylor
- EaStCHEM,
School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, United Kingdom
| | - James Douglas
- EaStCHEM,
School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, United Kingdom
| | - Christopher J. Collett
- EaStCHEM,
School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, United Kingdom
| | - Louis C. Morrill
- EaStCHEM,
School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, United Kingdom
| | - Charlene Fallan
- EaStCHEM,
School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, United Kingdom
| | - Alexandra M. Z. Slawin
- EaStCHEM,
School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, United Kingdom
| | - Gwydion Churchill
- Process
Research and Development, AstraZeneca, Macclesfield, Cheshire SK10 2NA, United Kingdom
| | - Andrew D. Smith
- EaStCHEM,
School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, United Kingdom
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50
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Enders D, Grossmann A, Van Craen D. N-heterocyclic carbene catalyzed synthesis of oxime esters. Org Biomol Chem 2013; 11:138-41. [PMID: 23104187 DOI: 10.1039/c2ob26974k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A triazolium salt derived N-heterocyclic carbene catalyzes the redox esterification reaction between α-β-unsaturated aldehydes and oximes. The resulting saturated oxime esters were obtained in very good yields for a broad range of aliphatic, aromatic and heteroaromatic substrates.
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Affiliation(s)
- Dieter Enders
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
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