DAURIA M.; PIANCATELLI G.; SSETTRI A., TETRAHEDRON, 1980, 36, NO 20-21, 3071-3074
作者:DAURIA M.、 PIANCATELLI G.、 SSETTRI A.
DOI:——
日期:——
Synthesis of 4-ylidenebutenolides and 4-oxo-2-enoic acid methyl esters from 5-methoxy-2-furyl carbinols
作者:M. D'Auria、G. Piancatelli、A. Scettri
DOI:10.1016/0040-4020(80)88034-3
日期:1980.1
5-methoxy-2-furyl carbinols (8) were converted by ZnCl2 catalysis into a 3:1 mixture of 4-ylidene-butenolides (9) and 4-oxo-2-enoic acid methyl esters (10). The carbonium ion 12 is the key intermediate, the stability of which made the conversion very fast providing high yields.