Practical Asymmetric Synthesis of Aprepitant, a Potent Human NK-1 Receptor Antagonist, via a Stereoselective Lewis Acid-Catalyzed Trans Acetalization Reaction
作者:Matthew M. Zhao、James M. McNamara、Guo-Jie Ho、Khateeta M. Emerson、Zhiguo J. Song、David M. Tschaen、Karel M. J. Brands、Ulf-H Dolling、Edward J. J. Grabowski、Paul J. Reider、Ian F. Cottrell、Michael S. Ashwood、Brian C. Bishop
DOI:10.1021/jo0203793
日期:2002.9.1
and high-yielding synthesis of aprepitant (1), a potent substance P (SP) receptor antagonist, is described. The enantiopure oxazinone 16 starting material was synthesized via a novel crystallization-induced dynamic resolution process. Conversion of 16 to the penultimate intermediate cis-sec-amine 9 features a highly stereoselective Lewis acid-catalyzed trans acetalization of chiral alcohol 3 with trichloroacetimidate
描述了高效化合物P(SP)受体拮抗剂aprepitant(1)的简化合成方法。对映体纯的恶嗪酮16原料是通过新型的结晶诱导的动态拆分过程合成的。16转化为倒数第二个中间体顺式-仲胺9的特征在于手性醇3与三氯乙酰亚氨酸酯18的高度立体选择性路易斯酸催化的反式缩醛化,然后反转吗啉环上相邻的手性中心。合成9的六步过程以极高的总收率(81%)且仅需两次分离即可完成。