Custom synthesis of substituted butenolides, dihydropyranones, and α-E-alkylidenelactones via alkenylalumination
作者:P. Veeraraghavan Ramachandran、Debarshi Pratihar、Garrett Garner、B. China Raju
DOI:10.1016/j.tetlet.2011.06.103
日期:2011.9
trifluoroacetic acid lactonizes to furnish α-acetoxyalkyl butenolides (n = 1) and dihydropyranones (n = 2) in 40% overall yield. Conjugateaddition to these lactenones and concurrent acetate elimination constitute a general and stereospecificsynthesis of the corresponding α-E-alkylidene lactones.