Enantioselective Synthesis of α-Alkyl,α-Vinyl Amino Acids via [2,3]-Sigmatropic Rearrangement of Selenimides
作者:Alan Armstrong、Daniel P. G. Emmerson
DOI:10.1021/ol1030926
日期:2011.3.4
Chiral α-alkyl,α-vinyl amino acids (quaternary vinyl glycine derivatives) are prepared with high levels of enantiomeric purity by [2,3]-sigmatropic rearrangement of allylic selenimides. The required trisubstituted allylic selenides are prepared by an organocatalytic α-selenenylation of aldehydes followed by Horner−Wadsworth−Emmons (HWE) olefination. Both (E)-and (Z)-geometrical isomers are available
通过烯丙基硒酰亚胺的[2,3]-σ重排,制备具有高水平对映体纯度的手性α-烷基,α-乙烯基氨基酸(季乙烯基甘氨酸衍生物)。所需的三取代的烯丙基硒化物是通过醛的有机催化α-硒烯化,然后进行Horner-Wadsworth-Emmons(HWE)烯化反应制备的。(E)-和(Z)-几何异构体均可用,从而获得所需产物的两种对映异构体。