Convenient synthesis of (2R)- and (2S)-2-(1-methylethyl)-5-oxo-2-phenylpentanenitrile, intermediates in the preparation of phenylalkylamine calcium channel blockers
作者:Jeremy Gilmore、Will Prowse、David Steggles、Michael Urquhart、Jennifer Olkowski
DOI:10.1039/p19960002845
日期:——
The multigram synthesis of (2S)- and (2R)-2-(1-methylethyl)-5-oxo-2-phenylpentanenitriles 9a and 9b is described, using either (4R)-2,2-dimethyl-1,3-dioxolan-4-ylmethanol or (2R)-butane-1,2,4-triol as chiral auxiliary. The configuration of an intermediate dioxolane 10b is assigned by X-ray crystallography. The synthetic utility of the aldehydes is demonstrated by conversion to both enantiomers of the
描述了使用(4 R)-2,2-二甲基-1中的(2 S)-和(2 R)-2-(1-甲基乙基)-5-氧代-2-苯基戊腈9g和9b的多谱合成法1,3-二氧戊环-4-基甲醇或(2 - [R )-丁烷-1,2,4-三醇作为手性助剂。中间二氧戊环10b的构型通过X射线晶体学确定。醛的合成效用通过> 98%对映体过量(ee)转化为钙拮抗剂去甲环磷酰胺的两种对映体来证明。在手性溶剂化剂(1 R)-(-)-2,2,2-三氟-1-(9-蒽基)乙醇存在下,通过1 H NMR光谱分析最终胺的对映体纯度。