Asymmetric Synthesis of Merck’s Potent hNK<sub>1</sub> Antagonist and Its Stereoisomers via Tandem Acylation/[3,3]-Rearrangement of 1,2-Oxazine <i>N</i>-Oxides
作者:Valentin S. Dorokhov、Yulia V. Nelyubina、Sema L. Ioffe、Alexey Yu. Sukhorukov
DOI:10.1021/acs.joc.0c01322
日期:2020.9.4
An asymmetric total synthesis of Merck’s hNK1 antagonist and three of its stereoisomers was accomplished in 10 steps. The synthesis involves a stereoselective assembly of 1,2-oxazine N-oxide by the [4 + 2]-cycloaddition, site-selective C–H oxygenation using a novel tandem acylation/[3,3]-rearrangement process and the reductive 1,2-oxazine ring contraction into a pyrrolidine ring as key stages. Using
默克公司的hNK 1拮抗剂及其三种立体异构体的不对称总合成可在10个步骤中完成。合成涉及通过[4 + 2]-环加成,1,2-恶嗪N-氧化物的立体选择性组装,使用新型串联酰化/ [3,3]-重排过程和还原性1的位置选择性CH氧化。 ,2-恶嗪环收缩成吡咯烷环为关键阶段。使用该策略,以极高的区域选择性和立体选择性构建了稠合的吡咯烷亚基。此处描述的方法可用于获取对映纯3,4-二取代的脯氨醇,它们经常在药学上相关的分子和有机催化剂中发现。