The instant invention relates to a process for preparing a compound of formula (I):
1
said process comprising a step (B) which consists in performing a Michael addition of a thioacid RS
4
H on to an &agr;-substituted acrylamide derivative.
The invention also relates to the enantioselective synthesis of compounds of formula (I) wherein R
2
is other than H, in the preferential (S, S) configuration:
2
本发明涉及一种制备式(I)化合物的方法:包括步骤(B),该步骤包括在α取代
丙烯酰胺衍
生物上执行
硫代酸RS4H的Michael加成。本发明还涉及式(I)化合物的对映选择性合成,其中R2不是H,在(S, S)构型中优先。