3-Substituted-3-fluoropyruvic acids and their esters and salts, and production thereof

摘要

A 3-substituted-3-fluoropyruvic acid and its ester and salt of the formula: (I) wherein R is a lower alkyl group, a lower alkanoyl group, a fluorinated lower alkanoyl group, a substituted or unsubstituted phenyl group or a substituted or unsubstituted pyridyl group and R' is a hydrogen atom, an ester-forming residue or a salt-forming residue, and their production.