Fluorinated Ketene Dithioacetals;1. Preparation and Application to the Synthesis of α-Trifluoromethylthiocarboxylic<i>S</i>-Esters and Aldehyde Derivatives
作者:Murielle Muzard、Charles Portella
DOI:10.1055/s-1992-26280
日期:——
α-Trifluoromethylketene dithioacetals 3 were synthesized by Peterson reaction from trifluoromethyl ketones 1 and trimethylsilyl dithioacetals 2. Acid hydrolysis and reduction yielded α-trifluoromethylthiocarboxylic S-esters 4 and α-trifluoromethyl dithioacetals 5, respectively. Transacetalisation of the latter with ethanol gave the corresponding diethyl acetal. New procedures were developed to effect reduction and transacetalisation.
α-三氟甲基乙烯酮二硫缩醛3是通过Peterson反应从三氟甲基酮1和三甲基甲硅烷基二硫缩醛2合成的。酸水解和还原分别产生α-三氟甲基硫代羧酸S-酯4和α-三氟甲基二硫缩醛5。后者用乙醇进行转缩醛化,得到相应的二乙缩醛。开发了新的程序来实现还原和转缩醛化。