Tetrahedron p. 3071 - 3074 (1980)
Update date:2022-08-03
Topics:
D'Auria, M.
Piancatelli, G.
Scettri, A.
5-Methoxy-2-furyl-carbinols (8) were converted by ZnCl2 catalysis into 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.
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(1980)Doi:10.1016/j.bmcl.2014.06.011
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(2007)
