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。