METHOD FOR PRODUCTION OF 2, 3-DIHYDROXY-1,2- BENZISOTHIAZOL-3-ONE-1,1-DIOXIDE

摘要

An improved method for preparation of 2,3-dihydroxy-I)2-benzisothiazol-3-one-I,l-dioxide from alky! anthranilate and alkali metal salt of nitrous acid via formation of respective diazonium salt. This diazonium salt is reacted with in-situ generated sulphur dioxide. The organic phase is treated with an oxidizing agent followed by amidation.