Synthesis of n-methyl-3-carboxy-2-chloro-dibenzo[c,f][1,4,5]oxa-thiazepine s,s-dioxide and its derivatives
A new dibenzo-condensed oxathiazepinecarboxylic acid was obtained starting from the methyl ester of 2,4-dichloro-5-chlorosulfonylbenzoic acid. Derivatives were obtained from N-phenylamide and N-methylamide of 2,4-dichloro-5-chlorosulfonylbenzoic acid. Methods for the preparation of the starting aromatic sulfonyl chlorides were proposed.