Synthesis and stereostructure of some 5,5′-disubstituted 3-acetyl-2,2′-BI-2H-1,3,4-oxa(thia)diazolines

Article abstract of DOI:10.1016/S0040-4020(01)85624-6

The synthesis of some (methyl)glyoxal 1,2-bis(acylhydrazones) (1, 3-6) and their cyclization into the title compounds (7-10) under acetylating conditions are described. The stereostructures of the new biheterocyclic diastereomers were studied by ¹