期刊
TETRAHEDRON
卷 65, 期 51, 页码 10709-10714出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2009.10.036
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-
资金
- Institute for Material Chemistry and Engineering, Kyushu University
A Diels-Alder reaction of alpha-tropolone and electron-deficient dienophiles prompted by Et3N or silica gel was performed. Reaction with the highly reactive dienophile, N-methylmaleimide, proceeded smoothly in the presence of Et3N or silica gel to yield adducts as a mixture of endo and exo isomers. Both catalysts accelerated endo/exo isomerization of the product, and detailed examination of the reaction using hinokitiol and N-methylmaleimide revealed that isomerization proceeds via an intramolecular path without retro Diels-Alder reaction. Successful cycloaddition reactions were established with six other dienophiles: acrylonitrile, methyl acrylate, ethyl vinyl ketone, dimethyl fumalate, dimethyl malate, and dimethyl acetylenedicarboxylate, and the corresponding adducts were obtained in good to moderate yields. (C) 2009 Elsevier Ltd. All rights reserved.
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