A process for preparing a compound of formula (A), (B) or (C): wherein P is H, CH3 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(CH3)2OH, C(CH3)(C(CH3)3)OH or COCH3; Z is C2-C10 alkyl or C2-C10 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.
一种制备化合物(A)、(B)或(C)的方法:其中P为H、
CH3或羟基保护基团;X为O、受保护的酮、OH、受保护的羟基团或H;Y为OH、受保护的羟基团或H;W为C( )2OH、C( )(C( )3)OH或CO ;Z为C2-C10烷基或C2-C10芳基烷基;′为单键或双键。该方法是在
氢气和还原烷基化催化剂存在下进行还原烷基化的过程。