Novel heterocycles. Synthesis of 2,3-dihydro-6-methyl-2-phenyl-4H,6H- pyranol[3,2-c][2,1]benzothiazin-4-one 5,5-dioxide and related compounds

Article abstract of DOI:10.1002/jhet.5570350433

The reaction of 2-chloro-4-(methylsulfonyl)benzoyl chloride (5) with 1- methyl-1H-2,1-benzothiazin-4-(3H)-one 2,2-dioxide (4) gave the O-benzoyl compound, 1-methyl-2,2-dioxido-1H-2,1-benzothiazin-4-yl 2-chloro-4- (methylsulfonyl)benzoate (6), which rearra