5.7%. The label was introduced as sodium [1-14C]acetate, which was converted via the acid chloride to the (S)-2-hydroxy-1,2,2-triphenylethyl ester 4. Chiral condensation of 4 with aldehyde 5 gave the chiral ester intermediate 6 with a yield of about 70%. Following transesterification of 6 to a methyl ester and condensation with tert-butyl lithioacetate to give (R)-β-ketoester 8, a second chiral center
[14C]
阿托伐他汀以10步顺序合成,总产率为5.7%。标记物以 [1-14C]
乙酸钠形式引入,通过酰
氯转化为 (S)-2-羟基-1,2,2-三苯
乙酯 4。4 与醛 5 的手性缩合得到手性酯中间体6,产率约70%。在 6 酯交换为甲酯并与
硫代乙酸锂叔丁酯缩合得到 (R)-β-
酮酯 8 后,通过还原羟基酮 3 生成第二个手性中心,得到 (R,R)-二羟基酯 9然后通过酸将其转化为内酯11。在结晶过程中从母液中获得的所需纯非对映异构体11然后转化为相应的
钙盐(2:1)13(
阿托伐他汀)。版权所有 © 1999 John Wiley & Sons, Ltd.