(R)-(+)-5-甲基-5-{4-[2-(2-(5-氯吲唑基))乙氧基]苄基}-2,4-噁唑烷二酮的合成及其绝对构型的确定
mag(2009)
Abstract
以(S)-(-)-1-苯乙胺为拆分剂对外消旋的α-羟基酸进行拆分,得到手性α-羟基酯4,再与尿素合环、脱甲基保护,得到关键的手性中间体(R)-(+)-5-甲基-5-(4-羟基苄基)-2,4-噁唑烷二酮(6).将化合物6与甲磺酸酯(8)缩合即得具有全新化学结构的标题化合物9(ee值100%),其结构经1H NMR和HRMS确证.根据拆分盐3的单晶X射线衍射分析结果及由α-羟基酯4与尿素合环生成噁唑烷二酮的反应机理,确定标题化合物9的绝对构型为R.
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