New heterocyclic ring systems. IX. Polyazadithiasteroid analogues

The synthesis of the novel tricyclic ring 5-rnethyl-4-oxo-2,3,4,5-tetrahydrothiopyrano[3,2-c]-[1,2]benzothiazine 6,6-dioxide (III) is described. By the reaction of hydrazine and hydroxylamine with the glyoxylate (IV) and ester (V) obtained from III, several polyazadithiasteriod analogues have been synthesized.