钯催化的光化学已被证明是一种通过烷基自由基进行烯烃交叉偶联和多功能化反应的有效策略。在这里,我们证明异腈可以作为自由基受体,参与进一步的自由基级联环化以提供菲啶衍生物。我们还将这种光催化过程扩展到以 TMSCH 2 I 作为自由基前体的一锅法级联甲基化反应。进一步的实验和计算研究表明,获得烷基自由基的分子内单电子转移过程参与了这种转变。
Selective C(sp<sup>3</sup>)–H activation of simple alkanes: visible light-induced metal-free synthesis of phenanthridines with H<sub>2</sub>O<sub>2</sub> as a sustainable oxidant
A visible light-induced metal-free C(sp3)–H phenanthridinylation of simple alkanes with isonitrile is developed with H2O2 as a terminal sustainable oxidant.
The benzoylperoxide (BPO)-promoted phenanthridinylation of simple alkanes with isonitrile is developed via C(sp(3))-H and C(sp(2))-H bond cleavage. This procedure is featured by dual C-C bond formation proceeding with the addition of an alkyl radical to isonitrile followed by radicalaromatic cyclization.
A Free Radical Cascade Cyclization of Isocyanides with Simple Alkanes and Alcohols
作者:Zejiang Li、Fenghua Fan、Jie Yang、Zhong-Quan Liu
DOI:10.1021/ol501461u
日期:2014.6.20
A copper-catalyzed free-radical cascade cyclization of isocyanides with simple alkanes and alcohols was developed, which allowed convenient access to various alkyl-substituted phenanthridines.