Process for preparing optically active cis-3-hydroxy-2,3-dihydro-1,5-benzothiazepin-4(5H)-one compounds [I] of the formula:
wherein Ring A and Ring B are substituted or unsubstituted benzene, R¹ is hydrogen or di-lower alkylaminoalkyl, which comprises subjecting 1,5-benzothiazepin-4(5H)-one (II) of the formula [II]:
wherein R⁴ is hydrogen or lower alkanoyl, and the other symbols are the same as defined above, to asymmetric reduction with a reaction product of optically active α-amino acid and metal hydride, in high optically yield, and said compounds [I] are very important as intermediate for preparing various medicines.
制备光学活性顺式-3-羟基-
2,3-二氢-1,5-苯并硫氮杂卓-4(5H)-酮化合物[I]的工艺:
其中环 A 和环 B 是取代或未取代的苯,R¹ 是氢或二低级烷基
氨基烷基,该工艺包括将式[II]的 1,5-苯并
硫氮杂卓-4(5H)-酮(II):
其中 R⁴为氢或低级烷酰基,其他符号与上述定义相同,用光学活性
α-氨基酸和
金属
氢化物的反应产物进行不对称还原,光学收率高,所述化合物[I]是制备各种药物的非常重要的中间体。