We report one-pot and chemoselective Knoevenagel-type reactions using highly stable amides and lactams as the electrophilic substrates. The method is based on the in situ activation of amide carbonyl with triflic anhydride and a subsequent reaction with carbanions generated in situ from carbonyl compounds. The amide-based method is an alternative to the versatile thioamide-based Eschenmoser sulfide contraction.
我们报告了以高度稳定的
酰胺和内
酰胺为亲电底物的一锅
化学选择性克诺文纳格尔型反应。该方法基于
酰胺羰基与三酸酐的原位活化,以及随后与羰基化合物原位生成的
碳离子反应。这种基于
酰胺的方法是基于
硫代
酰胺的埃申莫瑟
硫化收缩法的替代方法。