title: New steroidal nitrosoureas.
abstract: Reformatsky reaction of 3beta, 21-diacyloxy-and 3beta-methoxy-21-acyloxy-5-pregnen-20-one with ethyl bromoacetate yields, through an intramolecular 1,2-acyl migration, 38, 20 XI-diacyloxy- and 3 beta-methoxy-20 XI-acyloxy-14alpha-card-5-enolide respectively. The 20 XI-acyloxy-14, alpha-card-5-enolides were converted into the respective 20 XI-hydroxy-14alpha-card-5-enolides and the 14 alpha card-5,20(22)-dienolides. Experimental support to the proposed intramolecular 1,2-acyl migration is provided by the use of labelled compounds.
mesh_terms: D000818:Animals; D001667:Binding, Competitive; D001681:Biological Assay; D002417:Cattle; D005260:Female; D007700:Kinetics; D009607:Nitrosourea Compounds / Q000138:chemical synthesis* / Q000494:pharmacology; D011960:Receptors, Estrogen / Q000187:drug effects; D011980:Receptors, Progesterone / Q000187:drug effects; D012756:Sheep; D013237:Stereoisomerism; D014599:Uterus / Q000187:drug effects
chemical_list: D009607:Nitrosourea Compounds; D011960:Receptors, Estrogen; D011980:Receptors, Progesterone