期刊
TETRAHEDRON LETTERS
卷 55, 期 2, 页码 411-414出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2013.11.038
关键词
4-Unsubstituted dihydropyrimidine; 1,3-Diaza-1,3-butadiene; 1,2-Disubstituted ethylene; Cyclization; Elimination
资金
- Grants-in-Aid for Scientific Research [24790122] Funding Source: KAKEN
A synthetic method for novel 4-unsubstituted 2-phenyldihydropyrimidines having acyl and alkoxycarbonyl groups at the 5- and 6-positions was developed. The cyclization of 4-dimethylamino-1,3-diaza-1,3-butadiene having N-protecting groups (Boc, Cbz) with 1,2-disubstituted ethylenes, such as diethyl maleate, diethyl fumarate, (Z)-hex-3-ene-2,5-dione, (E)-1,4-diphenylbut-2-ene-1,4-dione, and unsymmetrical (E)-ethyl 4-oxo-4-phenylbut-2-enoate, following the elimination of a dimethylamino group proceeded smoothly, producing the corresponding dihydropyrimidines in good overall yield. The N-protecting group (Boc) could be easily removed to obtain N-unsubstituted dihydropyrimidines as a mixture of tautomers, and their tautomeric behavior was analyzed by H-1 NMR spectroscopy. (C) 2013 Elsevier Ltd. All rights reserved.
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