A compound of the formula ##STR1## wherein R.sub.1 is hydrogen or methyl, R.sub.2 is methyl or ethyl, the A,B,C and D rings optionally have one or more double bonds and are optionally substituted with one or more members of the group consisting of halogen protected hydroxy, 1/8O, alkyl and alkoxy of 1 to 4 carbon atoms and alkenyl and alkynyl of 2 to 4 carbon atoms, R is selected from the group consisting of halogen, --OH, alkoxy of 1 to 6 carbon atoms, aralkoxy of 7 to 15 carbon atoms, alkylthio of 1 to 6 carbon atoms, arylthio of 6 to 14 carbon atoms, aralkylthio of 7 to 15 carbon atoms and ##STR2## wherein R.sub.3 and R.sub.4 are individually selected from the group consisting of hydrogen, alkyl of 1 to 6 carbon atoms and aralkyl of 7 to 15 carbon atoms or R.sub.3 and R.sub.4 together with the nitrogen atom form another heterocycle optionally containing a nitrogen atom or oxygen atom and their preparation and their use to form 20-keto-pregnanes.
公式为##STR1##的化合物,其中R.sub.1为氢或甲基,R.sub.2为甲基或乙基,A、B、C和D环可选择具有一个或多个双键,并且可选择用由卤素保护的羟基、1/8O、1至4个碳原子的烷基和烷氧基以及2至4个碳原子的烯基和炔基中的一个或多个成员替代,R选自卤素、-OH、1至6个碳原子的烷氧基、7至15个碳原子的芳基烷氧基、1至6个碳原子的烷基
硫基、6至14个碳原子的芳基
硫基、7至15个碳原子的芳基烷基
硫基和##STR2##其中R.sub.3和R.sub.4分别选自氢、1至6个碳原子的烷基和7至15个碳原子的芳基烷基,或R.sub.3和R.sub.4与氮原子一起形成另一个杂环,该杂环可选择包含氮原子或氧原子,以及它们的制备和用于形成20-酮孕烷。