Process for (<i>S</i>)-Ketamine and (<i>S</i>)-Norketamine via Resolution Combined with Racemization
作者:Shenghua Gao、Xuezhi Gao、Zenong Wu、Houyong Li、Zhezhou Yang、Fuli Zhang
DOI:10.1021/acs.joc.0c01090
日期:2020.7.2
Subsequently, racemization of the unwanted (R)-1a remained in resolution mother liquor was performed in the presence of a Lewis acid in quantitative yield with >99.0% chemical purity. This original and economical process afforded esketamine in 67.4% (28.9% without racemization) overall yield with two times recycling of the mother liquor without column purification. In addition, this procedure can also be
简明,可回收,且有效的方法提出了一种用于制备(的小号) -氯胺酮(esketamine,(小号) - 1A)通过经典分辨率不需要的异构体的回收相结合。以可商购的酮2为起始原料,该程序具有三个步骤,其中包括(1)独特的羟基化环扩展重排,(2)通过甲磺酸盐进行轻度胺化以及(3)使用L -(+)-酒石酸进行手性分离。这三个简单步骤均在温和条件下进行,无需重结晶即可在99.5%ee中获得(S)-1a酒石酸盐。随后,将不需要的(R)消旋化保留在拆分母液中的1a是在路易斯酸存在下以定量收率进行的,化学收率> 99.0%。这种原始且经济的过程提供了67.4%的艾氯胺酮(如果没有消旋,则为28.9%),其母液无需柱纯化即可循环使用两次。另外,该方法也可用于制备更安全的潜在抗抑郁药(S)-去甲酮胺。