A process for preparing the two enantiomers of β-[(2-amino-1-naphthalenyl)thio]-α-hydroxy-4-methoxybenzenepropionic acid comprising resolution of rac-β-[(2-amino-1-naphthalenyl)thio]-α-hydroxy-4-methoxybenzenepropanoic acid by means of (+)-1-(p-hydroxybenzyl)-1,2,3,4,5,6,7,8-octahydroisoquinoline and, if desired, conversion of the enantiomers obtained into the optically active naphtho[1,2-b][1,4]thiazepin-4(5H)-ones of the general formulae
wherein R¹ is hydrogen, lower alkanoyl, lower cycloalkylcarbonyl or one of the groups -CO-O-(C₁-C₅ alkyl) and -CO-(CH₂)m-O(C₁-C₃ alkyl) and m is 1 or 2,
which are known calcium channel blockers and accordingly are useful as agents for lowering blood pressure and treating ischemia.
一种制备 β-[(2-
氨基-1-
萘基)
硫]-α-羟基-4-
甲氧基苯丙酸的两种对映体的工艺,包括用 (+)-1-(p-hydroxybenzyl)-1、2,3,4,5,6,7,8-八氢
异喹啉,并根据需要将得到的对映体转化为具有光学活性的
萘并[1,2-b][1,4]
硫氮杂卓-4(5H)-酮,其通式为
其中 R¹ 为氢、低级烷酰基、低级环烷基羰基或基团 -CO-O-(C₁-C₅烷基)和 -CO-(CH₂)m-O(C₁-C₃烷基)之一,且 m 为 1 或 2、
是已知的
钙通道阻滞剂,因此可用作降血压和治疗缺血的药物。