C–H Functionalization via Remote Hydride Elimination: Palladium Catalyzed Dehydrogenation of <i>ortho</i>-Acyl Phenols to Flavonoids
作者:Xiaomei Zhao、Jiabin Zhou、Shuying Lin、Xukang Jin、Renhua Liu
DOI:10.1021/acs.orglett.6b03652
日期:2017.3.3
Although deprotonation of electron-poor C–H bonds to carbon anions with bases has long been known and widely used in organic synthesis, the hydride elimination from electron-rich C–H bonds to carbon cations or partial carbocations for the introduction of nucleophiles is a comparatively less explored area. Here we report that the carbonyl β-C(sp3)–H bond hydrogens of ortho-acyl phenols could be substituted
尽管人们早就知道贫电子的C–H键与碱形成碳阴离子的去质子化并广泛用于有机合成中,但从富电子的C–H键与碳阳离子或部分碳阳离子的氢化物消除是引入亲核试剂的一个重要方法。勘探面积相对较少。在这里,我们报道邻酰基苯酚的羰基β-C(sp 3)–H键氢可被分子内酚羟基取代形成O杂环,然后将O杂环脱氢成类黄酮。在不添加氧化剂和不牺牲氢受体的情况下,Pd / C催化级联反应。