Pd-Catalyzed Umpolung Chemistry of Glycal Acetates and Their [2,3]-Dehydrosugar Isomers
作者:Juyeol Lee、Young Ho Rhee
DOI:10.1021/acs.orglett.1c04004
日期:2022.1.21
Glycals and their [2,3]-dehydrosugar derivatives have commonly been used in synthetic chemistry as electrophiles. Here we report a Pd-catalyzed polar inversion (umpolung) of this reaction, where the glycals and isomers can be used as nucleophiles. The reaction showed high regio- and stereoselectivity in the presence of numerous aromatic and aliphatic aldehydes. The synthetic utility of this reaction
Glycals 和它们的 [2,3]-脱氢糖衍生物通常在合成化学中用作亲电子试剂。在这里,我们报告了该反应的 Pd 催化的极性反转(umpolung),其中糖基和异构体可用作亲核试剂。在大量芳香族和脂肪族醛的存在下,该反应显示出高区域选择性和立体选择性。该反应的合成效用通过抗癌天然产物粘液素的四氢吡喃片段的短合成得到证明。