Acid salt of methane sulfu00f4nico, process for the esterification of dihydro - phenyl glycine or phenyl glycine methyl ester and the use of the corresponding salt of acid methyl ester sulfu00f4nico methane - dihydro - phenyl glycine ester or methyl phenyl glycine

摘要

Sulfu00f4nico acid salt, process for the esterification of an organic acid ester of the acid in the corresponding organic acid salt and the use of a sulfonico an alkyl ester of an amino acid. The present invention relates to a salt of an acid sulfu00f4nico alkyl ester amino acid.The invention also relates to a process for the esterification of an organic acid in its corresponding ester of organic acid, comprising contacting the organic acid with a strong acid and a solution comprising Di alkyl carbonate in a reactional mixture.The invention also relates to the use of a salt of an alkyl ester sulfu00e2nico acid amino acid in the synthesis of an antibiotic 198 - lactam.