Peterson olefination reaction using (trimethylgermyl)acetate. Stereoselective synthesis of (E)-2-alkenoic acid esters
摘要:
Peterson-type reaction of (trimethylgermyl)acetates 1 with aldehydes and ketones 2 gave stereoselectively (E)-2-alkenoic acid esters (E)-4 after stirring at -78-degrees-C and warming to room temperature. High yields of the reaction intermediates threo- and erythro-3-hydroxy-2-(trimethylgermyl)alkanoic acid esters 3 were obtained when the reaction was quenched at -78-degrees-C. The paths for conversion of threo-3 and erythro-3 to (E)-4 are discussed.