The present invention relates to an improved process for preparation of Rivastigmine of formula (I) or pharmaceutically acceptable salts thereof comprising a step of N-methylation of compound of formula (III), wherein R
1
=R
2
=H or R
1
=H and R
2
=CH
3
or an acid addition salt thereof, using paraformaldehyde in the presence of Raney Nickel and hydrogen in a suitable solvent to obtain compound of formula (II).
                            本发明涉及一种改进的
利巴韦林(
化学式(I))或其药用盐的制备方法,包括使用对
甲醛在Raney
镍和
氢气存在下对化合物的N-甲基化步骤,其中化合物的
化学式为(III),其中R1=R2=H或R1=H且R2=
CH3或其酸盐加合物,使用合适的溶剂获得化合物的
化学式(II)。