The Knoevenagel condensation of beta-ketothioesters with various aldehydes proceeds efficiently, affording the condensation products in moderate to good yield even in cases where the reactions of the corresponding beta-ketoesters give the adducts in only low to moderate yield. (C) 2002 Published by Elsevier Science Ltd.
A two step synthetic strategy for obtaining 2-alkenyl-1,3-dicarbonyl compounds from the corresponding 1,3-dicarbonyl compounds is reported. The method is based on a Knoevenagel condensation and a Michael addition using a high order organocuprate procedure, and proves to be of general value, Obtained compounds are useful starting materials for the synthesis of furan derivatives, (C) 2002 Elsevier Science Ltd. All rights reserved.
WO2006/66070
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Acid catalyzed ring closure reactions of electrophilic alkenes
作者:Roland Verhé、Norbert de Kimpe、Dirk Courtheyn、Laurent de Buyck、Niceas Schamp
DOI:10.1016/0040-4020(82)80073-2
日期:1982.1
3-acyl-2-alkyl-4,5-dihydrofurans. Similar cyclization of α-acyl-α,β-unsaturated esters initially afforded 3-alkoxycarbonyl-2-alkyl-4,5-dihydrofurans which were transformed into 2-acylbutanolides on further reaction with sulfuric acid.
The Knoevenagel condensation of beta-ketothioesters with various aldehydes proceeds efficiently, affording the condensation products in moderate to good yield even in cases where the reactions of the corresponding beta-ketoesters give the adducts in only low to moderate yield. (C) 2002 Published by Elsevier Science Ltd.