A process for preparing (S)-(+)-10,11-dihydro-10-hydroxy-5H-dibenz/b,f/azepine-5-carboxamide or (R)-(-)-10,11-dihydro-10-hydroxy-5H-dibenz/b,f/azepine-5-carboxamide, by reduction of oxcarbazepine in the presence of a catalyst and a hydride source is disclosed. The catalyst is prepared from a combination of [RuX2(L)]2 wherein X is chlorine, bromine or iodine, and L is an aryl or aryl-aliphatic ligand, with a ligand of formula (A) or formula (B):
wherein R1 is chosen from C1-6 alkoxy and C1-6 alkyl, n is a number from 0 to 5, and when n is a number from 2 to 5, R1 can be the same or different, and R2 is alkyl, substituted alkyl, aryl, substituted aryl, alkaryl or substituted alkaryl. The hydride source is either NR3R4R5 and formic acid, [R3R4R5NH][OOCH] and optionally formic acid, or [M][OOCH]x and formic acid, wherein R3, R4 and R5 are C1-6 alkyl, M is an alkali metal or alkaline earth metal and x is 1 or 2. A pH from 6.5 to 8 is maintained during the process.
本发明公开了一种在催化剂和
氢化物源存在下通过还原
奥卡西平制备(S)-(+)-10,11-二氢-10-羟基-5H-二苯并/b,f/氮杂卓-5-甲酰胺或(R)-(-)-10,11-二氢-10-羟基-5H-二苯并/b,f/氮杂卓-5-甲酰胺的工艺。该催化剂由[RuX2(L)]2(其中 X 为
氯、
溴或
碘,L 为芳基或芳基脂肪族
配体)与式(A)或式(B)
配体的组合制备而成:
其中 R1 选自 C1-6 烷氧基和 C1-6 烷基,n 为 0 至 5 的数字,当 n 为 2 至 5 的数字时,R1 可以相同或不同,R2 为烷基、取代烷基、芳基、取代芳基、烷芳基或取代烷芳基。
氢化物源为 NR3R4R5 和
甲酸、[R3R4R5NH][OOCH]和可选
甲酸或 [M][OOCH]x 和
甲酸,其中 R3、R4 和 R5 为 C1-6 烷基,M 为碱
金属或碱土
金属,x 为 1 或 2。在此过程中,pH 值保持在 6.5 至 8 之间。