A Facile, Six-Step Process for the Synthesis of (3<i>S</i>,5<i>S</i>)-3-Isopropyl-5-((2<i>S</i>,4<i>S</i>)-4-isopropyl-5-oxo-tetrahydrofuran-2-yl)-2-oxopyrrolidine-1-carboxylic Acid <i>tert</i>-Butyl Ester, The Key Synthetic Intermediate of Aliskiren
作者:Xianhua Pan、Siyao Xu、Rui Huang、Wansheng Yu、Feng Liu
DOI:10.1021/acs.oprd.5b00009
日期:2015.6.19
A facile, six-step process for the synthesis of (3S,5S)-3-isopropyl-5-((2S,4S)-4-isopropyl-5-oxotetrahydro- furan-2-yl)-2-oxopyrrolidine-1-carboxylic acid tert-butyl ester from (S)-4-benzyloxazolidin-2-one 2 in an overall 50% yield is reported. The key transformations include: a highly efficient diastereoselective epoxidation, Lewis acid-catalyzed ring-opening with bromide, an S(N)2 reaction using NaN3, and a tandem reduction-cyclization reaction.