Asymmetric Synthesis of Functionalized <i>trans-</i>Cyclopropoxy Building Block for Grazoprevir
作者:Feng Xu、Yong-Li Zhong、Hongming Li、Ji Qi、Richard Desmond、Zhiguo J. Song、Jeonghan Park、Tao Wang、Matthew Truppo、Guy R. Humphrey、Rebecca T. Ruck
DOI:10.1021/acs.orglett.7b02867
日期:2017.11.3
A practical and asymmetric synthesis of a functionalized trans-cyclopropoxy building block for the preparation of the HCV NS3/4a protease inhibitor grazoprevir is reported. Intramolecular SN2 displacement–ring closure, followed by a Baeyer–Villiger oxidation, yields the desired trans-cyclopropanol with full control of diastereoselectivity. A terminal alkyne is then effectively installed using LiNH(CH2)2NEt2
报道了用于制备HCV NS3 / 4a蛋白酶抑制剂格拉佐普韦的官能化反式-环丙氧基结构单元的实用和不对称合成。分子内S N 2置换-环闭合,然后进行Baeyer-Villiger氧化,可制得所需的反式-环丙醇,并完全控制非对映选择性。然后使用LiNH(CH 2)2 NEt 2有效地安装末端炔烃。从(S)-表氯醇开始,以51%的总收率制备了环丙氧基结构单元,光学纯度> 99.8%,无需分离任何中间体。