1
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Goswami G, Singh B, Wani IA, Mal A, Ghorai MK. A Synthetic Route to Tetrahydro-1 H-azepino[4,3,2- cd]indoles via Ring-Opening Cyclization of Activated Azetidines with 4-Bromoindole: Toward a Vasopressin V2 Receptor Antagonist. J Org Chem 2024; 89:11576-11587. [PMID: 39102588 DOI: 10.1021/acs.joc.4c01270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/07/2024]
Abstract
A simple one-pot, two-step strategy for the synthesis of tetrahydro-1H-azepino[4,3,2-cd]indoles via Lewis acid-catalyzed SN2-type ring opening of activated azetidines with 4-bromoindole, followed by a Pd-catalyzed intramolecular C-N cyclization reaction, with good to excellent yields is described. Utilizing this protocol, the vasopressin V2 receptor antagonist precursor has been synthesized easily. Enantioenriched tetrahydro-1H-azepino[4,3,2-cd]indoles were obtained by starting from enantiopure azetidine.
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Affiliation(s)
- Gaurav Goswami
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Bharat Singh
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Imtiyaz Ahmad Wani
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Abhijit Mal
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Manas K Ghorai
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
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2
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Malarney KP, Kc S, Schmidt VA. Recent strategies used in the synthesis of saturated four-membered heterocycles. Org Biomol Chem 2021; 19:8425-8441. [PMID: 34546272 DOI: 10.1039/d1ob00988e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The importance and prevalance of O-, N-, and S-atom containing saturated four-membered ring motifs in biologically active molecules and potential therapeutics continues to drive efforts in their efficient synthetic preparation. In this review, general and recent strategies for the synthesis of these heterocycles are presented. Due to the limited potential bond disconnections, retrosynthetic strategies are broadly limited to cyclizations and cycloadditions. Nonetheless, diverse approaches for accessing cyclization precursors have been developed, ranging from nucleophilic substitution to C-H functionalization. Innovative methods for substrate activation have been developed for cycloadditions under photochemical and thermal conditions. Advances in accessing oxetanes, azetidines, and thietanes remain active areas of research with continued breakthroughs anticipated to enable future applications.
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Affiliation(s)
- Kien P Malarney
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA, 92071, USA.
| | - Shekhar Kc
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA, 92071, USA.
| | - Valerie A Schmidt
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA, 92071, USA.
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3
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Takeda Y, Toyoda K, Sameera WMC, Tohnai N, Minakata S. Palladium‐Catalyzed Regioselective and Stereospecific Ring‐Opening Suzuki‐Miyaura Arylative Cross‐Coupling of 2‐Arylazetidines with Arylboronic Acids. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100195] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Youhei Takeda
- Department of Applied Chemistry Graduate School of Engineering Osaka University Yamadaoka 2-1 Suita Osaka 5650871 Japan
| | - Kazuya Toyoda
- Department of Applied Chemistry Graduate School of Engineering Osaka University Yamadaoka 2-1 Suita Osaka 5650871 Japan
| | - W. M. C. Sameera
- Institute of Low Temperature Science Hokkaido University North 19 Kita-ku, Sapporo Hokkaido 0600819 Japan
| | - Norimitsu Tohnai
- Department of Applied Chemistry Graduate School of Engineering Osaka University Yamadaoka 2-1 Suita Osaka 5650871 Japan
| | - Satoshi Minakata
- Department of Applied Chemistry Graduate School of Engineering Osaka University Yamadaoka 2-1 Suita Osaka 5650871 Japan
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4
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Igarashi E, Sakamoto K, Yoshimura T, Matsuo JI. Formal [4+2] cycloaddition of 3-phenylcyclobutanones with nitriles. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2018.11.040] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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5
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Bhattacharyya A, Shahi CK, Pradhan S, Ghorai MK. Stereospecific Synthesis of 1,4,5,6-Tetrahydropyrimidines via Domino Ring-Opening Cyclization of Activated Aziridines with α-Acidic Isocyanides. Org Lett 2018; 20:2925-2928. [DOI: 10.1021/acs.orglett.8b00986] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
| | | | - Sajan Pradhan
- Indian Institute of Technology Kanpur, 208016, Kanpur, Uttar Pradesh, India
| | - Manas K. Ghorai
- Indian Institute of Technology Kanpur, 208016, Kanpur, Uttar Pradesh, India
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6
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Veeraswamy V, Goswami G, Mukherjee S, Ghosh K, Saha ML, Sengupta A, Ghorai MK. Memory of Chirality Concept in Asymmetric Intermolecular Michael Addition of α-Amino Ester Enolates to Enones and Nitroalkenes. J Org Chem 2018; 83:1106-1115. [PMID: 29272115 DOI: 10.1021/acs.joc.7b02315] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A highly stereoselective asymmetric intermolecular conjugate addition of α-amino ester derivatives to cyclic enones via the memory of chirality (MOC) concept in high yields with excellent diastereo- and enantioselectivity (dr >99:1, up to 99% ee) is reported. The applicability and the generality of the strategy was demonstrated by its further exploration to acyclic α,β-unsaturated ketone and aromatic nitroalkenes, resulting in the formation of δ-keto-α-amino ester derivative and γ-nitro-α-amino ester derivatives, respectively, with excellent ee and dr.
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Affiliation(s)
| | - Gaurav Goswami
- Department of Chemistry, Indian Institute of Technology , Kanpur, 208016, India
| | | | - Koena Ghosh
- Department of Chemistry, Indian Institute of Technology , Kanpur, 208016, India
| | - Manik Lal Saha
- Department of Chemistry, Indian Institute of Technology , Kanpur, 208016, India
| | - Arunava Sengupta
- Department of Chemistry, Indian Institute of Technology , Kanpur, 208016, India
| | - Manas K Ghorai
- Department of Chemistry, Indian Institute of Technology , Kanpur, 208016, India
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7
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Wang X, Liu C, Zeng X, Wang X, Wang X, Hu Y. Ruthenium-Catalyzed Synthesis of Fused Tricyclic 1H-2,3-Dihydropyrimido[1,2-a]quinolines in One Step. Org Lett 2017; 19:3378-3381. [DOI: 10.1021/acs.orglett.7b01330] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xingyong Wang
- Key Laboratory of Bioorganic
Phosphorus Chemistry and Chemical Biology (Ministry of Education),
Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
| | - Chulong Liu
- Key Laboratory of Bioorganic
Phosphorus Chemistry and Chemical Biology (Ministry of Education),
Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
| | - Xiaobao Zeng
- Key Laboratory of Bioorganic
Phosphorus Chemistry and Chemical Biology (Ministry of Education),
Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
| | - Xuesong Wang
- Key Laboratory of Bioorganic
Phosphorus Chemistry and Chemical Biology (Ministry of Education),
Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
| | - Xinyan Wang
- Key Laboratory of Bioorganic
Phosphorus Chemistry and Chemical Biology (Ministry of Education),
Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
| | - Yuefei Hu
- Key Laboratory of Bioorganic
Phosphorus Chemistry and Chemical Biology (Ministry of Education),
Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
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8
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Zhang Y, Geng Z, Li J, Zou D, Wu Y, Wu Y. Ligand-Controlled Palladium-Catalyzed Pyridylation of 1-tert-Butoxycarbonyl-3-iodoazetidine: Regioselective Synthesis of 2- and 3-Heteroarylazetidines. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201600470] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Yudan Zhang
- The College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou People's Republic of China
| | - Zhiyue Geng
- The College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou People's Republic of China
| | - Jingya Li
- The College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou People's Republic of China
- Collaborative Innovation Center of New Drug Research and Safety Evaluation; Henan Province People's Republic of China
| | - Dapeng Zou
- The College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou People's Republic of China
- Collaborative Innovation Center of New Drug Research and Safety Evaluation; Henan Province People's Republic of China
| | - Yangjie Wu
- The College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou People's Republic of China
- Collaborative Innovation Center of New Drug Research and Safety Evaluation; Henan Province People's Republic of China
| | - Yusheng Wu
- The College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou People's Republic of China
- Collaborative Innovation Center of New Drug Research and Safety Evaluation; Henan Province People's Republic of China
- Tetranov International, Inc.; 100 Jersey Avenue, Suite A340 New Brunswick NJ 08901 USA
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9
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Ghorai MK, Halder S, Das S. Domino Michael–Michael and Aldol–Aldol Reactions: Diastereoselective Synthesis of Functionalized Cyclohexanone Derivatives Containing Quaternary Carbon Center. J Org Chem 2015; 80:9700-12. [PMID: 26334184 DOI: 10.1021/acs.joc.5b01768] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Manas K. Ghorai
- Department of Chemistry, Indian Institute of Technology, Kanpur, 208016, India
| | - Sandipan Halder
- Department of Chemistry, Indian Institute of Technology, Kanpur, 208016, India
| | - Subhomoy Das
- Department of Chemistry, Indian Institute of Technology, Kanpur, 208016, India
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10
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Ring Expansions of Activated Aziridines and Azetidines. TOPICS IN HETEROCYCLIC CHEMISTRY 2015. [DOI: 10.1007/7081_2015_159] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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11
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Ghorai MK, Das S, Das K, Kumar A. Stereoselective synthesis of activated 2-arylazetidines via imino-aldol reaction. Org Biomol Chem 2015. [DOI: 10.1039/c5ob01140j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A highly stereoselective synthesis ofN-sulfinyl andN-sulfonyl azetidines have been developed involving imino-aldol reaction of ester enolates with aldimines.
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Affiliation(s)
- Manas K. Ghorai
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
| | - Subhomoy Das
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
| | - Kalpataru Das
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
| | - Amit Kumar
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
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12
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Pawar SK, Vasu D, Liu RS. Gold- and Silver-Catalyzed [4+2] Cycloadditions of Ynamides with Oxetanes and Azetidines. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400024] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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13
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Nair V, Deepthi A, Ashok D, Raveendran AE, Paul RR. 1,4-Dipolar cycloadditions and related reactions. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.03.014] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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14
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Ghorai MK, Nanaji Y. Synthetic route to chiral indolines via ring-opening/C-N cyclization of activated 2-haloarylaziridines. J Org Chem 2013; 78:3867-78. [PMID: 23548056 DOI: 10.1021/jo400287a] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A practical approach for the synthesis of 3-substituted indolines via regio- and stereoselective SN2-type ring-opening of 2-(2-halophenyl)-N-tosylaziridines with heteroatomic nucleophiles (O, N, and S) followed by palladium-catalyzed intramolecular C-N cyclization is reported in excellent yields (up to >99%) and enantiomeric excess (ee 99%).
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Affiliation(s)
- Manas K Ghorai
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India.
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15
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Drouillat B, Wright K, David O, Couty F. Insight into the Regioselectivity of Nucleophilic Ring-Opening of Azetidinium Ions Containing Quaternary Carbon Atoms. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200890] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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16
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Kenis S, D’hooghe M, Verniest G, Dang Thi TA, Pham The C, Van Nguyen T, De Kimpe N. Synthesis of 1-Alkyl-2-(trifluoromethyl)azetidines and Their Regiospecific Ring Opening toward Diverse α-(Trifluoromethyl)Amines via Intermediate Azetidinium Salts. J Org Chem 2012; 77:5982-92. [DOI: 10.1021/jo300694y] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Sara Kenis
- Department of Sustainable Organic
Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent,
Belgium
| | - Matthias D’hooghe
- Department of Sustainable Organic
Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent,
Belgium
| | - Guido Verniest
- Department of Sustainable Organic
Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent,
Belgium
| | - Tuyet Anh Dang Thi
- Institute of Chemistry, Vietnam Academy of Sciences & Technology, 18 Hoang Quoc Viet, Cau giay, Hanoi, Vietnam
| | - Chinh Pham The
- Institute of Chemistry, Vietnam Academy of Sciences & Technology, 18 Hoang Quoc Viet, Cau giay, Hanoi, Vietnam
| | - Tuyen Van Nguyen
- Institute of Chemistry, Vietnam Academy of Sciences & Technology, 18 Hoang Quoc Viet, Cau giay, Hanoi, Vietnam
| | - Norbert De Kimpe
- Department of Sustainable Organic
Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent,
Belgium
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17
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Ghorai MK, Shukla D, Bhattacharyya A. Syntheses of Chiral β- and γ-Amino Ethers, Morpholines, and Their Homologues via Nucleophilic Ring-Opening of Chiral Activated Aziridines and Azetidines. J Org Chem 2012; 77:3740-53. [DOI: 10.1021/jo300002u] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Manas K. Ghorai
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Dipti Shukla
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
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18
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Mangelinckx S, De Sterck B, Colpaert F, Catak S, Jacobs J, Rooryck S, Waroquier M, Van Speybroeck V, De Kimpe N. Diastereoselective Aldol Reaction of Zincated 3-Chloro-3-methyl-1-azaallylic Anions as Key Step in the Synthesis of 1,2,3,4-Tetrasubstituted 3-Chloroazetidines. J Org Chem 2012; 77:3415-25. [DOI: 10.1021/jo300203t] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sven Mangelinckx
- Department of Sustainable Organic
Chemistry and Technology, Faculty of Bioscience Engineering, Ghent
University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Bart De Sterck
- Center for Molecular Modeling,
Ghent University, Technologiepark 903, B-9052 Zwijnaarde, Belgium,
Member of QCMM Alliance Ghent-Brussels
| | - Filip Colpaert
- Department of Sustainable Organic
Chemistry and Technology, Faculty of Bioscience Engineering, Ghent
University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Saron Catak
- Center for Molecular Modeling,
Ghent University, Technologiepark 903, B-9052 Zwijnaarde, Belgium,
Member of QCMM Alliance Ghent-Brussels
| | - Jan Jacobs
- Department of Sustainable Organic
Chemistry and Technology, Faculty of Bioscience Engineering, Ghent
University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Stijn Rooryck
- Department of Sustainable Organic
Chemistry and Technology, Faculty of Bioscience Engineering, Ghent
University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Michel Waroquier
- Center for Molecular Modeling,
Ghent University, Technologiepark 903, B-9052 Zwijnaarde, Belgium,
Member of QCMM Alliance Ghent-Brussels
| | - Veronique Van Speybroeck
- Center for Molecular Modeling,
Ghent University, Technologiepark 903, B-9052 Zwijnaarde, Belgium,
Member of QCMM Alliance Ghent-Brussels
| | - Norbert De Kimpe
- Department of Sustainable Organic
Chemistry and Technology, Faculty of Bioscience Engineering, Ghent
University, Coupure Links 653, B-9000 Ghent, Belgium
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19
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Ho KYT, Aïssa C. Regioselective Cycloaddition of 3-Azetidinones and 3-Oxetanones with Alkynes through Nickel-Catalysed Carbon-Carbon Bond Activation. Chemistry 2012; 18:3486-9. [DOI: 10.1002/chem.201200167] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Indexed: 11/11/2022]
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20
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Ghorai MK, Halder S, Samanta S. Regioselective Addition of 1,3-Dicarbonyl Dianions to Carbonyl Compounds: One Pot Lactonization and Ketalization of δ-Hydroxy-β-keto Esters to Protected Pyrone Derivatives. Aust J Chem 2012. [DOI: 10.1071/ch12062] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A simple and efficient strategy for the synthesis of 6-substituted-2-pyrone derivatives, by BF3·OEt2 mediated one pot cyclization and keto-protection of δ-hydroxy-β-keto esters, obtained via regioselective addition of 1,3-dicarbonyl dianion of ethyl acetoacetate to aldehydes and ketones is described.
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21
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22
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Mohammadpoor-Baltork I, Moghadam M, Tangestaninejad S, Mirkhani V, Eskandari Z. A green and selective synthesis of 2-aryloxazines and 2-aryltetrahydropyrimidines. J Heterocycl Chem 2010. [DOI: 10.1002/jhet.557] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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23
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Ghorai MK, Halder S, Das RK. Domino Imino-Aldol−Aza-Michael Reaction: One-Pot Diastereo- and Enantioselective Synthesis of Piperidines. J Org Chem 2010; 75:7061-72. [PMID: 20932043 DOI: 10.1021/jo101680f] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Manas K. Ghorai
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Sandipan Halder
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Raj Kumar Das
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
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24
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Mangelinckx S, Nural Y, Dondas HA, Denolf B, Sillanpää R, De Kimpe N. Diastereoselective synthesis of 6-functionalized 4-aryl-1,3-oxazinan-2-ones and their application in the synthesis of 3-aryl-1,3-aminoalcohols and 6-arylpiperidine-2,4-diones. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.03.113] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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25
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Hata S, Fukuda D, Hachiya I, Shimizu M. Reductive Aldol and Mannich-Type Reactions of Azetidin-3-ones Promoted by Titanium Tetraiodide. Chem Asian J 2010; 5:473-7. [DOI: 10.1002/asia.200900457] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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26
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Ghorai MK, Kumar A, Tiwari DP. BF3·OEt2-Mediated Highly Regioselective SN2-Type Ring-Opening of N-Activated Aziridines and N-Activated Azetidines by Tetraalkylammonium Halides. J Org Chem 2009; 75:137-51. [DOI: 10.1021/jo902244y] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Manas K. Ghorai
- Department of Chemistry, Indian Institute of Technology, Kanpur, 208016, India
| | - Amit Kumar
- Department of Chemistry, Indian Institute of Technology, Kanpur, 208016, India
| | - Deo Prakash Tiwari
- Department of Chemistry, Indian Institute of Technology, Kanpur, 208016, India
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27
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Allart EA, Christie SDR, Pritchard GJ, Elsegood MRJ. Preparation of highly substituted tetrahydropyrans via a metal assisted dipolar cycloaddition reaction. Chem Commun (Camb) 2009:7339-41. [PMID: 20024221 DOI: 10.1039/b917332c] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A range of highly substituted tetrahydropyrans have been prepared by reaction of a donor-acceptor cyclobutane, where the donor is a metal-alkyne complex, with an aldehyde under Lewis acid conditions.
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Affiliation(s)
- Eric A Allart
- Department of Chemistry, Loughborough University, Loughborough, Leicestershire, UK LE11 3TU
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28
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Ghorai MK, Das K, Kumar A. An efficient synthetic route to substituted tetrahydropyrimidines by Cu(OTf)2-mediated nucleophilic ring-opening followed by the [4+2] cycloaddition of N-tosylazetidines with nitriles. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2008.12.035] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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29
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Brandi A, Cicchi S, Cordero FM. Novel Syntheses of Azetidines and Azetidinones. Chem Rev 2008; 108:3988-4035. [DOI: 10.1021/cr800325e] [Citation(s) in RCA: 395] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Alberto Brandi
- Dipartimento di Chimica Organica “Ugo Schiff”, Laboratorio di Progettazione, Sintesi e Studio di Eterocicli Biologicamente Attivi - HeteroBioLab, Università degli Studi di Firenze, via della Lastruccia 13, 50019 Sesto F.no (FI), Italy
| | - Stefano Cicchi
- Dipartimento di Chimica Organica “Ugo Schiff”, Laboratorio di Progettazione, Sintesi e Studio di Eterocicli Biologicamente Attivi - HeteroBioLab, Università degli Studi di Firenze, via della Lastruccia 13, 50019 Sesto F.no (FI), Italy
| | - Franca M. Cordero
- Dipartimento di Chimica Organica “Ugo Schiff”, Laboratorio di Progettazione, Sintesi e Studio di Eterocicli Biologicamente Attivi - HeteroBioLab, Università degli Studi di Firenze, via della Lastruccia 13, 50019 Sesto F.no (FI), Italy
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Ghorai MK, Kumar A, Das K. Lewis acid-mediated unprecedented ring-opening rearrangement of 2-aryl-N-tosylazetidines to enantiopure (E)-allylamines. Org Lett 2007; 9:5441-4. [PMID: 18020346 DOI: 10.1021/ol7023218] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A highly efficient strategy for Cu(OTf)2-mediated ring-opening of 2-aryl-N-tosylazetidines in polar and coordinating solvents followed by an unprecedented rearrangement to substituted achiral and chiral (E)-allylamines (ee >99%) is reported. The methodology has been applied for the synthesis of gamma-unsaturated-beta-amino acids. A plausible mechanism for the rearrangement is also described.
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Affiliation(s)
- Manas K Ghorai
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India.
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Ghorai MK, Das K, Kumar A. Lewis acid mediated SN2-type nucleophilic ring opening followed by [4+2] cycloaddition of N-tosylazetidines with aldehydes and ketones: synthesis of chiral 1,3-oxazinanes and 1,3-amino alcohols. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.04.097] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Ghorai MK, Kumar A, Halder S. Regioselective addition of 1,3-dicarbonyl dianion to N-sulfonyl aldimines: an expedient route to N-sulfonyl piperidines and N-sulfonyl azetidines. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.03.081] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Ghorai MK, Das K, Kumar A. A convenient synthetic route to enantiopure N-tosylazetidines from α-amino acids. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.02.033] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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