Quadruple N-heterocyclic carbene/cobalt/photoredox/Brønsted base catalysis is demonstrated, realizing branch-selective hydroacylation of styrenes with aromatic and aliphatic aldehydes. This protocol allows to access branched ketones from readily available materials in an atom-economical manner. The quadruple catalysis can transfer a formyl hydrogen of aldehydes as hydrogen radical equivalent onto terminal
展示了四重N-杂环卡宾/
钴/光氧化还原/布朗斯台德碱催化,实现了
苯乙烯与芳香族和脂肪族醛的支链选择性加氢酰化。该协议允许以原子经济的方式从容易获得的材料中获取支链酮。四重催化可以通过受控的电子和质子转移将醛的甲酰基氢作为氢自由基当量转移到烯烃的末端碳上。