申请人:G. D. Searle & Co.
公开号:US05145992A1
公开(公告)日:1992-09-08
A process for producing an .alpha.-alkoxy acetic acids and salts thereof which comprises reacting an alcohol of the formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 can be hydrogen, alkyl, alkoxy, halo, phenyl, substituted phenyl, or hydroxy; A can be S, O or --CH.sub.2 --; and Alk is straight or branched chain alkylene, with a base in an aprotic solvent, then reacting the resulting alkoxide with a monohaloacetic acid ester to give an alkoxyacetate followed by reaction of the alkoxyacetate with a hydrogen halide, organic acid or Lewis acid in nitromethane to give the corresponding .alpha.-alkoxyacetic acid which then may be recovered or may optionally be converted to the corresponding salt by contracting the .alpha.-alkoxyacetic acid with a base.
一种制备.alpha.-烷氧基乙酸及其盐的方法,包括将下式的醇与无水溶剂中的碱反应: ##STR1## 其中,R.sup.1,R.sup.2和R.sup.3可以是氢、烷基、烷氧基、卤素、苯基、取代苯基或羟基;A可以是S、O或--CH.sub.2 --;Alk是直链或支链烷基;然后将所得的烷氧基金属化合物与单卤代乙酸酯反应,得到烷氧基乙酸酯,随后将烷氧基乙酸酯与硝基甲烷中的氢卤酸、有机酸或路易斯酸反应,得到相应的.alpha.-烷氧基乙酸,然后可以回收.alpha.-烷氧基乙酸或选择与碱反应形成相应的盐。