作者:Eugenio Gandolfo、Xinjun Tang、Sudipta Raha Roy、Paolo Melchiorre
DOI:10.1002/anie.201910168
日期:2019.11.18
Photochemical enantioselective nickel-catalyzed cross-coupling reactions are difficult to implement. We report a visible-light-mediated strategy that successfully couples symmetrical anhydrides and 4-alkyl dihydropyridines (DHPs) to afford enantioenriched α-substituted ketones under mild conditions. The chemistry does not require exogenous photocatalysts. It is triggered by the direct excitation of
光化学对映选择性镍催化的交叉偶联反应难以实现。我们报告了一种可见光介导的策略,该策略成功地将对称酸酐和4-烷基二氢吡啶(DHPs)偶联,以在温和条件下提供对映体富集的α-取代的酮。化学过程不需要外源光催化剂。它是由DHPs的直接激发触发的,DHPs作为自由基源和还原剂,促进了手性催化镍络合物的周转。