This invention provides a process for producing compound [Ia] and [Ib] which comprises reacting compound [III] with a chiral carboxylic acid or amino acid, or a reactive derivative thereof, reacting the resulting compound [II] with a chlorinating agent, and separating diastereomers from the resulting diastereomer mixture.
wherein R1 typically represents hydrogen or halogen; R2 typically represents hydrogen; R3 typically represents alkyl; R4 represents chiral acyl or amino residue; X represents halogen, substituted or unsubstituted cyclic amino, or phenyl.
本发明提供了一种生产化合物[Ia]和[Ib]的工艺,该工艺包括将化合物[III]与手性
羧酸或
氨基酸或其反应衍
生物反应,将所得化合物[II]与
氯化剂反应,并从所得非对映异构体混合物中分离非对映异构体。
其中 R1 通常代表氢或卤素;R2 通常代表氢;R3 通常代表烷基;R4 代表手性酰基或
氨基残基;X 代表卤素、取代或未取代的环
氨基或苯基。