Document Type and Number:
Japanese Patent JPS5736911
Kind Code:
B2
Abstract:
Process for preparing 3,4-dihydro-1,2,3-oxathiazine-4-ones and their salts which comprises the addition of chlorosulfonylisocyanate to a beta -ketocarboxylic acid tert.-alkyl ester, conversion of the addition product obtained at temperatures of from 40 DEG to 100 DEG C by means of separation of CO2 and alkylene into the beta -ketocarboxylic acid amide-N-sulfochloride, by cyclization of same in an aprotic diluent by means of separation of hydrogen chloride - either in the presence of acid-binding agents or by heating up to temperatures above 50 DEG C - and by conversion of the reaction products obtained in known manner into oxathiazinones or salts thereof.
Application Number:
JP6035974A
Publication Date:
August 06, 1982
Filing Date:
May 30, 1974
Export Citation:
International Classes:
A23L27/30; C07D291/06