Synthese a partir du dimethyl-4,4 perhydropyrannyloxy pentanal via une dihydro-1,2 furannone-2 substituee
通过 une dihydro-1,2 furannone-2 取代基合成部分二甲基-4,4 perhydropyrannyloxy pentanal
Synthesis of Alkylidene(<i>gem</i>-Difluorocyclopropanes) from Propargyl Glycolates by a One-Pot Difluorocyclopropenation/Ireland–Claisen Rearrangement Sequence
difluorocyclopropenation/Ireland–Claisenrearrangement sequence applied to readily available propargyl glycolates was developed as a route toward functionalized alkylidene(gem-difluorocyclopropanes). This strategy conveniently avoids the isolation of the unstable 3,3-difluorocyclopropenylcarbinyl glycolates arising from the difluorocyclopropenation. The Ireland–Claisenrearrangement proceeds with high
A stereocontrolled synthesis of the hitherto unknown (±)-6,7-dideoxyforskolin has been accomplished, incorporating controlled C-ring annulation with simultaneous creation of the stereogenic center at C-13 via oxymercuration. An alternative attempt at C-ring elaboration via conjugateaddition of a higher order vinyl cupratereagent to dihydropyran-4-one resulted in the exclusive formation of its 13-epimer