17 a β-hydroxy-7 α-methyl-d-homo-19-norandrost-4,16-diene-3-one and the 17-esters thereof: methods of preparation and uses US4788218 Apr 28, 1986 Nov 29, 1988 Sri International 17 a β-hydroxy-7 α-methyl-d-homo-19-norandrost-4,16-diene-3-one and the 17-esters thereof: met...
Prepn. of (17R)-7-alkyl-2'-oxo-spiro (androst-4-ene-17,5'- (1',2')-oxathiolan)-3-ones of formula (I'A) (where the 7-alkyl gp. has 1-4C atoms) comprises reaction of a 17 beta-hydroxy-21- tert. -butylsulphinyl-(17-alpha)-pregna- 4,6-diene-3-one, as a mixt. of...