Practical Processes for Producing Fluorinated alpha-Ketocarboxylic Esters and Analogues Thereof
申请人:Central Glass Company, Limited
公开号:US20180050976A1
公开(公告)日:2018-02-22
It is possible to produce a fluorine-containing α-ketocarboxylic ester hydrate by reacting a fluorine-containing α-hydroxycarboxylic ester with sodium hypochlorite or calcium hypochlorite of 21 mass % or greater in mass percentage of composition. Furthermore, it is possible to produce a fluorine-containing α-ketocarboxylic ester by reacting the hydrate with a dehydrating agent. Furthermore, it is possible to produce a fluorine-containing α-ketocarboxylic ester hemiketal by reacting the fluorine-containing α-ketocarboxylic ester hydrate with a lower alcohol or a trialkyl orthocarboxylate. Moreover, it is possible to produce a fluorine-containing α-ketocarboxylic ester by reacting the hemiketal with a dealcoholization agent.
Difluoropyruvate was prepared fromtrifluoroaceticanhydride via 3 steps (Friedel–Crafts type addition, reductive defluorination, and ozonolysis) in 30% yield.