期刊
TETRAHEDRON LETTERS
卷 51, 期 52, 页码 6897-6900出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2010.10.124
关键词
Host-guest complex; Organocatalyst; Thiourea; Biginelli; Green method
资金
- CSIR, New Delhi
The host-guest complex between polyethylene glycol and thiourea dioxide (PEG.TUD) was prepared via different approaches involving co-crystallization method and by a chemical reaction. The resulting PEG.TUD complex was found to be very active and recyclable catalyst for the direct synthesis of 3,4-dihydropyrimidinones via Biginelli condensation and provided high product yields. Interestingly, the corresponding poly(ethylene glycol)-thiourea complexes, PEG.TU, were found to be unreactive and no reaction occurred under similar reaction conditions. (C) 2010 Elsevier Ltd. All rights reserved.
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