| 摘要 |
The invention relates to the compounds (I): …<IMAGE>… where R is methyl or free or protected -CH2OH, R1 and R'1 are methyl; branched alkyl (5 to 8 carbon atoms), aryl (up to 10 carbon atoms), heteroaryl or benzyl, n and m are 0 or 1, R2 and R3 are hydrogen or R2 is fluorine and R3 is formyloxy or acetyloxy and the dotted lines symbolise a possible bond, to their preparation from a delta-16(17) compound, to their application to the preparation of 16-methylene derivatives and to new intermediates. |
