Diastereoselective Preparation of (<i>R</i>)- and (<i>S</i>)-2-Methoxy-2-phenylpent-3-ynoic Acids and Their Use as Reliable Chiral Derivatizing Agents
作者:Salvador Pérez-Estrada、Pedro Joseph-Nathan、Hugo A. Jiménez-Vázquez、Manuel E. Medina-López、Francisco Ayala-Mata、L. Gerardo Zepeda
DOI:10.1021/jo2016554
日期:2012.2.17
O-acetals 1a and 1b were used as chiral auxiliaries to achieve the diastereoselective preparation of both enantiomers of 2-methoxy-2-phenylpent-3-ynoic acids (MPPAs). The latter were condensed with several chiral secondary alcohols and some primary amines to evaluate their potential as chiral derivatizing agents (CDAs). The 1H NMR spectra of the corresponding esters and amides showed strong consistency with
苯甲酰基-S,O-乙缩醛1a和1b用作手性助剂,以实现非对映选择性制备2-甲氧基-2-苯基戊-3-炔酸(MPPAs)的两种对映体。后者与几种手性仲醇和一些伯胺缩合,以评估其作为手性衍生剂(CDA)的潜力。的1个对应的酯和酰胺的1 H NMR光谱显示出很强的一致性与甲醇和胺部分,其观察到的ΔδL的绝对构型1和ΔδL 2个值分别为在0.1-0.4和0.02-0.12 ppm的范围。