Methods are provided for the synthesis of a compound of formula (X). R2 is selected from -H, -C1-C4-alkyl,-C2-C4-alkenyl and C1-C4-aryl; R3 is selected from -C(O)H and -C(O)C1-C4-alkyl; and A is a pharmaceutically acceptable anion (e.g.a halide). Also provided are intermediate compounds formed during the synthesis.
提供了一种合成化合物(X)的方法。其中,R2可选自-H、-C1-C4-烷基、-C2-C4-
烯基和C1-C4-芳基;R3可选自-C(O)H和-C(O)C1-C4-烷基;A是药用可接受的阴离子(例如卤素)。同时提供了在合成过程中形成的中间化合物。