Chiral allenamides are prepared with high levels of enantiomeric purity by [2,3]-sigmatropic rearrangement of propargylic sulfimides. The required branched propargylic sulfides are prepared by an enantioselective organocatalytic aldehyde α-sulfenylation followed by Corey−Fuchs alkynylation.
通过炔丙基
硫酰亚胺的[2,3]-σ重排,制备具有高
水平对映体纯度的手性烯丙酰胺。所需的支链炔丙基
硫化物是通过对映选择性有机催化醛α-亚磺酰基化,然后进行Corey-Fuchs炔基化反应制得的。