摘要:
It relates to a process for preparing a compound of formula (I), or a pharmaceutically or a cosmetically acceptable salt thereof, or a stereoisomer of any of them, wherein: R' is selected from the group consisting of H, (C1-C6)-alkyl, and (C3-C6)-cycloalkyl; R1, R2, R4, R5, R6, R7, R9, and R10are a radical independently selected from the group consisting of H, hydroxy, amino, (C1-C6)-alkyl, (C1-C6)-alkoxy, (C1-C6)-alkylamino, and (C1-C6)- dialkylamino; and R3,and R8are independently selected from the group consisting of (C1- C6)-alkyl, (C1-C6)-alkoxy, hydroxy, amino, (C1-C6)-alkylamino, and (C1-C6)-dialkylamino; the process comprising a beta-elimination reaction of the corresponding alkyl halide precursor in the presence of DBU and an appropriate solvent. It also relates to intermediates useful in such preparation process.