Ligand exchange reaction of sulfoxides in organic synthesis: A versatile procedure for one-carbon homologation of methylesters to esters, thioesters, carboxylic acids and amides
作者:Tsuyoshi Satoh、Hideaki Unno、Yasuhiro Mizu、Yasumasa Hayashi
DOI:10.1016/s0040-4020(97)00478-x
日期:1997.6
A novel two-step procedure for one-carbon homologation of methylesters to esters, thioesters, carboxylic acids and amides is described. Methylesters are reacted with lithium carbanion of chloromethyl phenyl sulfoxide to give α-chloro α-sulfinyl ketones in 70 to 90% yields. Potassium enolate of the α-chloro α-sulfinyl ketone was treated with tert-butyllithium at −78 °C to give alkynolate via alkylidene
描述了一种新颖的两步程序,用于将甲酯酯碳均一化为酯,硫代酯,羧酸和酰胺。使甲酯与氯甲基苯基亚砜的碳负离子锂反应,以70%至90%的收率得到α-氯代α-亚磺酰基酮。在-78°C下用叔丁基锂处理α-氯代α-亚磺酰基酮的烯醇钾,以通过亚烷基类胡萝卜素生成炔醇。将该中间体用醇,硫醇,5%NaOH水溶液和胺盐酸盐处理,分别以良好或优异的收率得到一碳均酸酯,酯,硫代酸酯,羧酸和酰胺。