期刊
TETRAHEDRON LETTERS
卷 53, 期 26, 页码 3349-3352出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2012.04.084
关键词
Furan; Pyran; Nitroalkene; Morita-Baylis-Hillman acetates; Cascade reaction
资金
- DST India
- CSIR India
The Morita-Baylis-Hillman (MBH) acetates derived from nitroalkenes and ethyl glyoxylate have been transformed in one pot at room temperature to highly fused and functionalized furans and pyrans in good to excellent yield. The reaction involves a cascade Michael-oxa-Michael addition of beta-dicarbonyl compounds to the MBH acetates in the presence of an amine base such as DABCO. An unusual switching of selectivity in the oxa-Michael addition from 5-exo-trig to 6-endo-trig was observed when the beta-dicarbonyl compound was changed from acyclic or six-membered ring cyclic to five-membered ring cyclic system. (C) 2012 Elsevier Ltd. All rights reserved.
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