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Yang W, Zhao Y, Bu Q, Li L, Zhou B, Huang Z. Tandem CuAAC/Ring Cleavage/[4 + 2] Annulation Reaction to Synthesize Dihydrooxazines and Conversion to 2-Aminopyrimidines. Org Lett 2021; 24:457-461. [PMID: 34935394 DOI: 10.1021/acs.orglett.1c04179] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A tandem CuAAC/ring cleavage/[4 + 2] annulation reaction of terminal ynones, sulfonyl azides, and oximes has been developed to synthesize functionalized dihydrooxazines under mild conditions. In particular, intermediate N-sulfonyl acylketenimines are the first example of a 4π-system participating in [4 + 2] cycloadditions, and dihydrooxazines can convert to 2-aminopyridines through ring cleavage under basic conditions.
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Affiliation(s)
- Weiguang Yang
- Guangdong Key Laboratory for Research and the Development of Natural Drugs, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, Guangdong 524023, China.,The Marine Biomedical Research Institute of Guangdong, Zhanjiang, Guangdong 524023, China
| | - Yu Zhao
- Guangdong Key Laboratory for Research and the Development of Natural Drugs, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, Guangdong 524023, China
| | - Qingxia Bu
- Department of Chemistry, School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210009, China
| | - Li Li
- Guangdong Key Laboratory for Research and the Development of Natural Drugs, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, Guangdong 524023, China
| | - Baojing Zhou
- Department of Chemistry, School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210009, China
| | - Zunnan Huang
- Guangdong Key Laboratory for Research and the Development of Natural Drugs, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, Guangdong 524023, China
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Henneveld JS, Gilmer SCL, Lucas NT, Hawkins BC. Rapid Generation of 2‐Acyl‐4‐phenyltetralones from 1,1‐Diacylphenylcyclopropanes. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | | | - Nigel T. Lucas
- Department of Chemistry University of Otago Dunedin 9054 New Zealand
| | - Bill C. Hawkins
- Department of Chemistry University of Otago Dunedin 9054 New Zealand
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3
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Gai S, Henneveld JS, Cording AP, Badart MP, Lucas NT, Hawkins BC. The synthesis of benzannulated spiroketals from 1,1-diacyl-2-phenylcyclopropanes. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.152984] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Craig AJ, Cording AP, Garden AL, Hawkins BC. Does the Reaction of Cyclopropyl Acid Chlorides and Imines To Form 1,3-Oxazin-4-enone Heterocycles Proceed via a Ketene or an N-Acyl-iminium Mechanism? J Org Chem 2020; 85:5486-5492. [PMID: 32207973 DOI: 10.1021/acs.joc.0c00229] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The mechanism of the reaction between cyclopropyl acid chlorides and imines to form 1,3-oxazin-4-enones was probed through physical and computational experiments. The data gathered strongly support the reaction proceeding through an N-acyl iminium intermediate mechanism rather than a ketene intermediate mechanism.
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Affiliation(s)
- Alexander J Craig
- Department of Chemistry, University of Otago, Dunedin 9054, New Zealand
| | - Andrew P Cording
- Department of Chemistry, University of Otago, Dunedin 9054, New Zealand
| | - Anna L Garden
- Department of Chemistry, University of Otago, Dunedin 9054, New Zealand
| | - Bill C Hawkins
- Department of Chemistry, University of Otago, Dunedin 9054, New Zealand
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5
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Affiliation(s)
- Shuning Mao
- Department of Chemistry; Lishui University No. 1; Xueyuan Road 323000 Lishui City Zhejiang Province P. R. China
| | - Kaijun Chen
- Department of Chemistry; Lishui University No. 1; Xueyuan Road 323000 Lishui City Zhejiang Province P. R. China
| | - Guobing Yan
- Department of Chemistry; Lishui University No. 1; Xueyuan Road 323000 Lishui City Zhejiang Province P. R. China
| | - Dayun Huang
- Department of Chemistry; Lishui University No. 1; Xueyuan Road 323000 Lishui City Zhejiang Province P. R. China
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6
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Gai S, Lucas NT, Hawkins BC. Benzannulated 6,5-Spiroketals from Donor–Acceptor Cyclopropanes. Org Lett 2019; 21:2872-2875. [DOI: 10.1021/acs.orglett.9b00878] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Sinan Gai
- Department of Chemistry, University of Otago, Dunedin 9054, New Zealand
| | - Nigel T. Lucas
- Department of Chemistry, University of Otago, Dunedin 9054, New Zealand
| | - Bill C. Hawkins
- Department of Chemistry, University of Otago, Dunedin 9054, New Zealand
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Smith RJ, Nhu D, Clark MR, Gai S, Lucas NT, Hawkins BC. Synthesis of Chromones from 1,1-Diacylcyclopropanes: Toward the Synthesis of Bromophycoic Acid E. J Org Chem 2017; 82:5317-5327. [PMID: 28440639 DOI: 10.1021/acs.joc.7b00648] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A tandem deprotection-cyclization reaction of 1,1-diacylcyclopropanes is described which allows rapid access to structurally diverse 2,3-disubstituted chromones in good yields, and with straightforward purification. The utility of this reaction is showcased by the construction of the potent antibacterial marine natural product bromophycoic acid E scaffold.
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Affiliation(s)
- Robert J Smith
- Department of Chemistry, University of Otago , Dunedin, New Zealand
| | - Duong Nhu
- Department of Chemistry, University of Otago , Dunedin, New Zealand
| | - Mitchell R Clark
- Department of Chemistry, University of Otago , Dunedin, New Zealand
| | - Sinan Gai
- Department of Chemistry, University of Otago , Dunedin, New Zealand
| | - Nigel T Lucas
- Department of Chemistry, University of Otago , Dunedin, New Zealand
| | - Bill C Hawkins
- Department of Chemistry, University of Otago , Dunedin, New Zealand
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Smith RJ, Mills DA, Nhu D, Tan EW, Lucas NT, Hawkins BC. The Synthesis of Multifunctionalized 1,3-Oxazin-4-ones from Donor–Acceptor Cyclopropanes. J Org Chem 2016; 81:2099-105. [DOI: 10.1021/acs.joc.6b00112] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Robert J. Smith
- Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Daniel A. Mills
- Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Duong Nhu
- Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Eng Wui Tan
- Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Nigel T. Lucas
- Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Bill C. Hawkins
- Department of Chemistry, University of Otago, Dunedin, New Zealand
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