A novel process for preparation of Deutetrabenazine ((RR, SS)-l,3,4,6,7-llb-Hexahydro-9,10-di(methoxy-d6)-3-(2-methylpropyl)-2H- benzo [a] quinolizin-2-one) of formula I comprises of methylation of N-(2-(3,4-dihydroxy-phenyl)-ethyl)-formamide compound of formula III with deuteriated methanol (CD3OD or CD3OH) to obtain d6-N-(2-(3,4-dimethoxy-phenyl)-ethyl)-formamide compound of formula IV; cyclization of d6-N-(2-(3,4-dimethoxy-phenyl)-ethyl)-formamide in presences of dehydrating agent to obtain d6-6,7-Dimethoxy-3,4-dihydroisoquinoline compound of formula V; reacting d6-6,7-Dimethoxy-3,4-dihydroisoquinoline compound of formula V with 2-acetyl-N,N,N,4-tetramethyl-1-pentanaminium iodide compound of formula VI.
一种用于制备Deutetrabenazine ((RR, SS)-l,3,4,6,7-llb-六氢-9,10-二(甲氧基-d6)-3-(2-甲基丙基)-2H-苯并[a]
喹啉-2-酮)的新型工艺包括将式III的N-(2-(3,4-二羟基苯基)-乙基)-甲酰胺化合物与
氘化
甲醇(CD3OD或CD3OH)甲基化,得到式IV的d6-N-(2-(3,4-二
甲氧基苯基)-乙基)-甲酰胺化合物;在脱
水剂存在下将d6-N-(2-(3,4-二
甲氧基苯基)-乙基)-甲酰胺环化,得到式V的d6-
6,7-二甲氧基-3,4-二氢异喹啉化合物;将式V的d6-
6,7-二甲氧基-3,4-二氢异喹啉化合物与式VI的2-乙酰-N,N,N,4-四甲基-
1-戊胺碘化物发生反应。