1
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Shukla K, Khushboo, Mahto P, Singh VK. Enantioselective synthesis of tetrahydrofuran spirooxindoles via domino oxa-Michael/Michael addition reaction using a bifunctional squaramide catalyst. Org Biomol Chem 2022; 20:4155-4160. [PMID: 35521781 DOI: 10.1039/d2ob00633b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An enantioselective approach for the synthesis of tetrahydrofuran spirooxindoles via domino oxa-Michael/Michael addition reaction of γ-hydroxyenones to isatylidene malononitriles, using a cinchona derived bifunctional squaramide catalyst has been developed. The methodology is the first success of enantioselective oxa-Michael addition to isatylidene malononitriles. The spiro products were obtained in excellent yields with moderate to good enantio- and diastereoselectivities. Scale-up of the reaction and synthetic transformation of the spiro product into structurally complex molecules have been performed.
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Affiliation(s)
- Khyati Shukla
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208 016, India.
| | - Khushboo
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208 016, India.
| | - Pratibha Mahto
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208 016, India.
| | - Vinod K Singh
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208 016, India.
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2
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Zhang D, Cheng Q, Chen L, Deng H, Cai H, Zhang QF. Lewis acid-catalyzed [3 + 2] annulations of oxindole based spirocyclic donor-acceptor cyclopropanes with ynamides. Org Biomol Chem 2021; 19:9645-9648. [PMID: 34730170 DOI: 10.1039/d1ob01922h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
[3 + 2] annulations of oxindole based spirocyclic donor-acceptor cyclopropanes and ynamides catalyzed by copper triflate have been developed for the synthesis of biologically important spirocyclopenteneoxindoles. These reactions tolerated a wide scope of substrates and provided the desired products in good to high yields (up to 90%) with up to >40 : 1 diastereoselectivities under mild conditions.
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Affiliation(s)
- Dongxin Zhang
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan 243002, China.
| | - Qihang Cheng
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan 243002, China.
| | - Lvjia Chen
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan 243002, China.
| | - Huiqing Deng
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan 243002, China.
| | - Hu Cai
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan 243002, China.
| | - Qian-Feng Zhang
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan 243002, China.
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3
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Zhang D, Cai H, Chen Y, Yin L, Zhong J, Zhang Y, Zhang QF. Ring Opening of Donor-Acceptor Cyclopropanes with Acyclic 1,3-Diketones for the Synthesis of 1,6-Dicarbonyl Compounds. J Org Chem 2020; 85:14262-14270. [PMID: 33115228 DOI: 10.1021/acs.joc.0c02290] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
1,6-Dicarbonyl compounds, representing the formal addition products of the α-position of acetophenone derivatives to donor-acceptor cyclopropanes, were synthesized in two steps via first ring opening of donor-acceptor cyclopropanes with acyclic 1,3-diketones followed by DBU catalyzed retro-Claisen-type C-C bond cleavage reactions. In the first step, acyclic 1,3-diketones selectively worked as C-nucleophiles to add to donor-acceptor cyclopropanes. In the second step, the alkyl ketone part of the ring-opening products resulting from unsymmetrical 1,3-diketones was selectively cleaved in the presence of DBU in methanol.
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Affiliation(s)
- Dongxin Zhang
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan, Anhui 243002, China
| | - Hu Cai
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan, Anhui 243002, China
| | - Yan Chen
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan, Anhui 243002, China
| | - Lei Yin
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan, Anhui 243002, China
| | - Junchao Zhong
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan, Anhui 243002, China
| | - Ying Zhang
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan, Anhui 243002, China
| | - Qian-Feng Zhang
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan, Anhui 243002, China
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4
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Zhang D, Zhong J, Yin L, Chen Y, Man J, Zhang QF. Desymmetrization of 1-Symmetrical Donor-Acceptor (D-A) Cyclopropanes via Reactions with 1,3-Cyclodiones. J Org Chem 2020; 85:5778-5786. [PMID: 32255650 DOI: 10.1021/acs.joc.9b03231] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new type of 1-unsymmetrical D-A cyclopropanes containing a cyclic enone motif was obtained by the desymmetrization of 1-symmetrical D-A cyclopropanes via first the Lewis acid-catalyzed O-nucleophilic ring-opening reaction with 1,3-cyclodiones followed by an organobase-promoted unexpected multistep intramolecular transformation.
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Affiliation(s)
- Dongxin Zhang
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan, Anhui 243002, China
| | - Junchao Zhong
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan, Anhui 243002, China
| | - Lei Yin
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan, Anhui 243002, China
| | - Yan Chen
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan, Anhui 243002, China
| | - Jingjing Man
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan, Anhui 243002, China
| | - Qian-Feng Zhang
- Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, No. 59 Hudong Road, Ma'anshan, Anhui 243002, China
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5
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Zhang D, Chen Y, Cai H, Yin L, Zhong J, Man J, Zhang QF, Bethi V, Tanaka F. Direct Catalytic Asymmetric Synthesis of Oxindole-Derived δ-Hydroxy-β-ketoesters by Aldol Reactions. Org Lett 2020; 22:6-10. [PMID: 31746616 DOI: 10.1021/acs.orglett.9b03527] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Direct asymmetric synthesis of δ-hydroxy-β-ketoesters was accomplished via regio- and enantioselective aldol reactions of β-ketoesters with isatins catalyzed by cinchona alkaloid thiourea derivatives. The C-C bond formation of the reactions occurred only at the γ-position of the β-ketoesters. Reaction progress monitoring and product stability analyses under the conditions that included the catalyst indicated that the γ-position reaction products were formed kinetically. Various δ-hydroxy-β-ketoesters bearing 3-alkyl-3-hydroxyoxindole cores relevant to the development of bioactive molecules were synthesized.
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Affiliation(s)
- Dongxin Zhang
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Yan Chen
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Hu Cai
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Lei Yin
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Junchao Zhong
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Jingjing Man
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Qian-Feng Zhang
- Institute of Molecular Engineering and Applied Chemistry , Anhui University of Technology , No. 59 Hudong Road , Ma'anshan , Anhui 243002 , China
| | - Venkati Bethi
- Chemistry and Chemical Bioengineering Unit , Okinawa Institute of Science and Technology Graduate University , 1919-1 Tancha , Onna , Okinawa 904-0495 , Japan
| | - Fujie Tanaka
- Chemistry and Chemical Bioengineering Unit , Okinawa Institute of Science and Technology Graduate University , 1919-1 Tancha , Onna , Okinawa 904-0495 , Japan
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Yang H, Liu D, Yu Q, Xia S, Yu D, Zhang M, Sun B, Zhang F. DBU‐Promoted Intramolecular Crossed Aldol Reaction: A Facile Access to Indane‐Fused Pyrrolidine. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801513] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Heng Yang
- Department of Pharmaceutical Engineering Wuhan University of Technology No. 122 Luoshi Road 430070 Wuhan P.R. China
| | - Dandan Liu
- Department of Pharmaceutical Engineering Wuhan University of Technology No. 122 Luoshi Road 430070 Wuhan P.R. China
| | - Qinqin Yu
- Department of Pharmaceutical Engineering Wuhan University of Technology No. 122 Luoshi Road 430070 Wuhan P.R. China
| | - Siyu Xia
- Department of Pharmaceutical Engineering Wuhan University of Technology No. 122 Luoshi Road 430070 Wuhan P.R. China
| | - Dan Yu
- Hubei Provincial Key Laboratory of Antiviral Drugs Hubei Livscien Pharm Sci&Tech Co., LTD 430205 Wuhan P.R. China
| | - Mao Zhang
- Hubei Provincial Key Laboratory of Antiviral Drugs Hubei Livscien Pharm Sci&Tech Co., LTD 430205 Wuhan P.R. China
| | - Bing Sun
- Department of Pharmaceutical Engineering Wuhan University of Technology No. 122 Luoshi Road 430070 Wuhan P.R. China
| | - Fang‐Lin Zhang
- Department of Pharmaceutical Engineering Wuhan University of Technology No. 122 Luoshi Road 430070 Wuhan P.R. China
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7
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Zhang D, Tanaka F. Determination of Relative Frequency of Carbanion Formation at α-Positions of Ketones under Aldol Reaction Catalysis Conditions. Org Lett 2017; 19:3803-3806. [DOI: 10.1021/acs.orglett.7b01676] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Dongxin Zhang
- Chemistry and Chemical Bioengineering
Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna, Okinawa 904-0495, Japan
| | - Fujie Tanaka
- Chemistry and Chemical Bioengineering
Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna, Okinawa 904-0495, Japan
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Rao VUB, Kumar K, Das T, Vanka K, Singh RP. DBU-Mediated Diastereoselective Aldol-Type Cyanomethylation of Isatins. J Org Chem 2017; 82:4489-4496. [PMID: 28357854 DOI: 10.1021/acs.joc.7b00512] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient, metal-free approach to 3-substituted 3-hydroxyoxindole by DBU-mediated highly diastereoselective addition of aryl acetonitrile to N-protected isatin under mild conditions has been developed. The reaction proceeds smoothly to produce respective cyanomethylated adducts in good yield and excellent diastereoselectivity. Further transformation of the cyanide group allowed the synthesis of an advance intermediate of corresponding (±) CPC analogue. The mechanistic insight toward the aldol-type cyanomethylation of N-tritylisatin with benzyl cyanide was obtained by DFT calculations.
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Affiliation(s)
- V U Bhaskara Rao
- Department of Chemistry, Indian Institute of Technology, Delhi , Hauz Khas, New Delhi 110016, India
| | - Krishna Kumar
- Department of Chemistry, Indian Institute of Technology, Delhi , Hauz Khas, New Delhi 110016, India
| | - Tamal Das
- Physical Chemistry Division, National Chemical Laboratory , Dr. Homi Bhabha Road, Pune 411008, India
| | - Kumar Vanka
- Physical Chemistry Division, National Chemical Laboratory , Dr. Homi Bhabha Road, Pune 411008, India
| | - Ravi P Singh
- Department of Chemistry, Indian Institute of Technology, Delhi , Hauz Khas, New Delhi 110016, India
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9
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Echave H, López R, Palomo C. Bifunctional Brønsted Base Catalyzes Direct Asymmetric Aldol Reaction of α-Keto Amides. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201510482] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Haizea Echave
- Departamento de Química Orgánica I, Facultad de Químicas; Universidad del País Vasco; Apdo. 1072 20080 San Sebastián Spain
| | - Rosa López
- Departamento de Química Orgánica I, Facultad de Químicas; Universidad del País Vasco; Apdo. 1072 20080 San Sebastián Spain
| | - Claudio Palomo
- Departamento de Química Orgánica I, Facultad de Químicas; Universidad del País Vasco; Apdo. 1072 20080 San Sebastián Spain
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10
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Echave H, López R, Palomo C. Bifunctional Brønsted Base Catalyzes Direct Asymmetric Aldol Reaction of α-Keto Amides. Angew Chem Int Ed Engl 2016; 55:3364-8. [DOI: 10.1002/anie.201510482] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Revised: 01/08/2016] [Indexed: 12/24/2022]
Affiliation(s)
- Haizea Echave
- Departamento de Química Orgánica I, Facultad de Químicas; Universidad del País Vasco; Apdo. 1072 20080 San Sebastián Spain
| | - Rosa López
- Departamento de Química Orgánica I, Facultad de Químicas; Universidad del País Vasco; Apdo. 1072 20080 San Sebastián Spain
| | - Claudio Palomo
- Departamento de Química Orgánica I, Facultad de Químicas; Universidad del País Vasco; Apdo. 1072 20080 San Sebastián Spain
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Zhang D, Tanaka F. Aldol Reactions of Ketone Donors with Aryl Trifluoromethyl Ketone Acceptors Catalyzed by 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) for Concise Access to Aryl- and Trifluoromethyl- Substituted Tertiary Alcohols. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500497] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Chouthaiwale PV, Tanaka F. Reactions of pyruvates: organocatalytic synthesis of functionalized dihydropyrans in one pot and further transformations to functionalized carbocycles and heterocycles. Chem Commun (Camb) 2014; 50:14881-4. [DOI: 10.1039/c4cc06035k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Concise cascade reactions of pyruvates with aldehydes that generate functionalized dihydropyran derivatives in one pot have been developed. The products, dihydropyrans, were further concisely transformed to various functionalized molecules.
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Affiliation(s)
- Pandurang V. Chouthaiwale
- Chemistry and Chemical Bioengineeing Unit
- Okinawa Institute of Science and Technology Graduate University
- Okinawa 904-0495, Japan
| | - Fujie Tanaka
- Chemistry and Chemical Bioengineeing Unit
- Okinawa Institute of Science and Technology Graduate University
- Okinawa 904-0495, Japan
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Wang L, Zhang D, Li J, Xu G, Sun J. A highly efficient DBU-catalyzed green synthesis of spiro-oxindoles. RSC Adv 2014. [DOI: 10.1039/c4ra08812c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A DBU-catalyzed green synthesis of spiro-oxindoles with 100% atom economy has been developed under environmentally benign conditions.
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Affiliation(s)
- Liqun Wang
- School of Pharmaceutical Engineering & Life Science
- Changzhou University
- Changzhou 213164, P. R. China
| | - Daming Zhang
- School of Pharmaceutical Engineering & Life Science
- Changzhou University
- Changzhou 213164, P. R. China
| | - Jian Li
- School of Pharmaceutical Engineering & Life Science
- Changzhou University
- Changzhou 213164, P. R. China
| | - Guangyang Xu
- School of Pharmaceutical Engineering & Life Science
- Changzhou University
- Changzhou 213164, P. R. China
| | - Jiangtao Sun
- School of Pharmaceutical Engineering & Life Science
- Changzhou University
- Changzhou 213164, P. R. China
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