Reformatsky Reaction of Methyl α-Bromoisobutyrate with 2-Arylmethylidenemalonic Acid Derivatives
作者:V. V. Shchepin、D. V. Fotin
DOI:10.1007/s11178-005-0286-8
日期:2005.7
Reformatsky reagent obtained by treatment of methyl α-bromoisobutyrate with zinc reacts with dimethyl 2-arylmethylidenemalonates to give trimethyl 2-aryl-3-methylbutane-1,1,3-tricarboxylates. The reaction of the same compound with ethyl 3-aryl-2-(4-methylphenylcarbamoyl)acrylates yields cyclic products, ethyl 4-aryl-5,5-dimethyl-1-(4-methylphenyl)-2,6-dioxopiperidine-3-carboxylates. Treatment of the latter with morpholine and phenylhydrazine leads to the corresponding 4-aryl-5,5-dimethyl-1-(4-methylphenyl)-2,6-dioxopiperidine-3-carboxylic acid morpholides and phenylhydrazides. The products are formed as a single diastereoisomer.
α-溴异丁酸甲酯与锌处理后得到的 Reformatsky 试剂与 2-芳基亚甲基丙二酸二甲酯反应,生成 2-芳基-3-甲基丁烷-1,1,3-三羧酸三甲酯。同一化合物与 3-芳基-2-(4-甲基苯基氨基甲酰基)丙烯酸乙酯反应生成环状产物,即 4-芳基-5,5-二甲基-1-(4-甲基苯基)-2,6-二氧代哌啶-3-羧酸乙酯。将后者与吗啉和苯肼处理,可得到相应的 4-芳基-5,5-二甲基-1-(4-甲基苯基)-2,6-二氧代哌啶-3-羧酸吗啉盐和苯肼。生成物为单一非对映异构体。