Synthesis of the title compounds has been achieved starting from 4‐oxo‐3,4‐dihydro‐2H,5H‐thiopyrano[3,2‐c][1]benzothiopyran 6,6‐dioxide (III), which was converted to glyoxylate (IV), β‐ketoester (V), difluoride complex (VII) and β‐diketone (XII) gave with hydrazine, hydroxyl‐amine and glycine ethyl ester several azadithiasteroid analogues.
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Fravolini et al. (1980) studied this question.
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