Dimethyl phthalide-3-phosphonates having various substituents on the benzene ring were regioselectively synthesized by the reaction of N,N-diethyl-2-formylbenzamides with tert-butyldimethylsilyl dimethyl phosphite followed by treatment with methanesulfonic acid. N,N-Diethyl-2-formylbenzamides were regioselectively prepared by ortho lithiation-formylation of the corresponding benzamides.
具有不同取代基的二甲基
邻苯二甲酸酯-3-
膦酸酯通过N,N-二乙基-2-甲酰基苯甲酰胺与叔丁基二甲基
硅基二
甲基膦酸酯反应,随后用
甲磺酸处理,选择性合成。N,N-二乙基-2-甲酰基苯甲酰胺则通过相应苯甲酰胺的邻位
锂化-甲酰化反应选择性制备。