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。