Lipase B from Candida antarctica (CALB) has been selected as the most suitable enzyme to catalyze the regioselective monoacetylation of 1,5-diol isoprostane intermediate, using vinyl acetate as an acyl transfer reagent in THF. We next applied this reaction on linear 2-substituted, 2,2′-disubstituted-1,5-pentanediols, and cyclic 2,3-disubstituted-1,5-pentanediols. To rationalize the regioselectivity
An efficient method for hydroazulenone from bicyclo[3.3.0]octanone via two carbon annulation
作者:Chwang Siek Pak、Sung Kee Kim、Hyeon Kyu Lee
DOI:10.1016/s0040-4039(00)79451-2
日期:1991.10
Hydroazulenones and hydroazulenediones are prepared efficiently from bicyclo[3.3.0]octanones via two carbon annulation utilizing thermal [2+2] cycloaddition of dichloroketene and fluoride or chloride induced fragmentation of the cycloadduct.