title: [Steroids and sex hormones. 242. Preparation of 14-beta-hydroxy-2-keto-delta-16-steroids: a new highly productive access to 33-O-methyl-17-alpha, 20-xi-tetrahydrobatrachotoxinin A].
mesh_terms: D000470:Alkaloids / Q000138:chemical synthesis*; D004988:Ethers, Cyclic; D007664:Ketosteroids / Q000138:chemical synthesis; D008745:Methylation; D010084:Oxidation-Reduction; D011278:Pregnanes / Q000138:chemical synthesis*; D011758:Pyrroles / Q000138:chemical synthesis; D014118:Toxins, Biological / Q000138:chemical synthesis*
chemical_list: D000470:Alkaloids; D004988:Ethers, Cyclic; D007664:Ketosteroids; D011278:Pregnanes; D011758:Pyrroles; D014118:Toxins, Biological
vernacular_title: Steroide und Sexualhormone. 242. Herstellung von 14 -Hydroxy-20-keto-  16 -Steroiden: Ein neuer ergiebiger Zugang zu 3-O-Methyl-17 , 20xi-tetrahydrobatrachotoxinin.