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Basak A, Saini M, Verma S. Catalytic Cycloisomerization of Enyne Diesters Derived From 2‐Propargyloxyarylaldehydes. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200026] [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]
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Denisov DA, Novikov RA, Tomilov YV. Lewis acid mediated Michael addition of non-aromatic multiple C C bonds to α,β-unsaturated dicarbonyl compounds. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153272] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Yamazaki S, Sugiura H, Ohashi S, Ishizuka K, Saimu R, Mikata Y, Ogawa A. Intramolecular [2 + 2] and [4 + 2] Cycloaddition Reactions of Cinnamylamides of Ethenetricarboxylate in Sequential Processes. J Org Chem 2016; 81:10863-10886. [PMID: 27723343 DOI: 10.1021/acs.joc.6b01947] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Intramolecular [2 + 2] and [4 + 2] cycloaddition reactions of cinnamylamides of ethenetricarboxylate in sequential processes have been studied. Reaction of 1,1-diethyl 2-hydrogen ethenetricarboxylate and trans-cinnamylamines in the presence of EDCI/HOBt/Et3N led to pyrrolidine products in one pot, via intramolecular [2 + 2], [4 + 2], and some other cyclizations. The types of the products depend on the substituents on the benzene ring and the reaction conditions. Reaction of cinnamylamines without substituents on the benzene ring and with halogens and OMe on the para position at room temperature gave cyclobutane-fused pyrrolidines as major products via [2 + 2] cycloaddition. The reaction at 80 °C in 1,2-dichloroethane gave δ-lactone fused pyrrolidines as major products, probably via ring-opening of the cyclobutanes. Interestingly, reaction of 1,1-diethyl 2-hydrogen ethenetricarboxylate and cinnamylamines bearing electron-withdrawing groups such as NO2, CN, CO2Me, CO2Et, and CF3 on ortho and para positions in the presence of EDCI/HOBt/Et3N at room temperature or at 60-80 °C gave tetrahydrobenz[f]isoindolines via [4 + 2] cycloaddition as major products. DFT studies have been performed to explained the observed [2 + 2]/[4 + 2] selectivity.
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Affiliation(s)
- Shoko Yamazaki
- Department of Chemistry, Nara University of Education , Takabatake-cho, Nara 630-8528, Japan
| | - Hirotaka Sugiura
- Department of Chemistry, Nara University of Education , Takabatake-cho, Nara 630-8528, Japan.,Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University , Gakuen-cho 1-1, Nakaku, Sakai, Osaka 599-8531, Japan
| | - Shinnosuke Ohashi
- Department of Chemistry, Nara University of Education , Takabatake-cho, Nara 630-8528, Japan
| | - Keisuke Ishizuka
- Department of Chemistry, Nara University of Education , Takabatake-cho, Nara 630-8528, Japan
| | - Rina Saimu
- Department of Chemistry, Nara University of Education , Takabatake-cho, Nara 630-8528, Japan
| | - Yuji Mikata
- KYOUSEI Science Center, Nara Women's University , Nara 630-8506, Japan
| | - Akiya Ogawa
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University , Gakuen-cho 1-1, Nakaku, Sakai, Osaka 599-8531, Japan
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Yamazaki S, Sugiura H, Niina M, Mikata Y, Ogawa A. Inter- and Intramolecular Diels-Alder Reaction of Ethenetricarboxylate Derivatives. HETEROCYCLES 2016. [DOI: 10.3987/com-15-13394] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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