| 摘要 |
The instant invention relates to a process for preparing a compound of formula (I):said process comprising a step (B) which consists in performing a Michael addition of a thioacid RS4H on to an alpha-substituted acrylamide derivative.The invention also relates to the enantioselective synthesis of compounds of formula (I) wherein R2 is other than H, in the preferential (S, S) configuration:.
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