| abstract |
A process for preparing a compound of formula (A), (B) or (C): n n n n n n n n n n wherein P is H, CH 3 or a hydroxyl protecting group; X is O, a protected ketone, OH, a protected hydroxyl group or H; Y is OH, a protected hydroxyl group or H; W is C(CH 3 ) 2 OH, C(CH 3 )(C(CH 3 ) 3 )OH or COCH 3 ; Z is C 2 -C 10 alkyl or C 2 -C 10 arylalkyl; and is a single bond or a double bond, is disclosed. The process is a reductive alkylation in the presence of hydrogen and a reductive alkylation catalyst. |