| 摘要 |
<p>Novel androstadiene-17-carboxylic acids are disclosed of the formula: (I) wherein R1 is H or Cl, each of R2 and R3 represents hydrogen, chlorine or fluorine with the proviso that at least one of these substituents is chlorine or fluorine when R1 is Cl and that R2 is only Cl or F ant R3 is H or Cl when R1 is H, R4 is Oh, whilst R3 and R4 together can also represent a further 9,11 C-C-bond or -O-, R5 represents a methyl group in the .alpha.- or .beta.-position, the ethylene group, a free hydroxyl group or a hydroxyl group which is esterified with a lower alkanoic acid, R6 represents a free hydroxyl group or a hydroxyl group which is esterified with a carboxylic acid having not more than 7 carbon atoms, whilst R5 and R6 together represent the 16.alpha.,17.alpha.-dihydroxy-acetonide group as well as to a process for the manufacture thereof and their use as intermediates in the production of therapeutically useful androstadiene-17-carboxylic acid esters.</p> |
