Photocatalytic Hydrazonyl Radical-Mediated Radical Cyclization/Allylation Cascade: Synthesis of Dihydropyrazoles and Tetrahydropyridazines
作者:Quan-Qing Zhao、Jun Chen、Dong-Mei Yan、Jia-Rong Chen、Wen-Jing Xiao
DOI:10.1021/acs.orglett.7b01609
日期:2017.7.7
photocatalytic hydrazonyl radical-mediated radical cyclization/allylation cascade reaction of β,γ-unsaturated hydrazones is developed using allyl sulfones and Morita–Baylis–Hillman adduct as allyl sources, which provides an efficient and practical access to various diversely functionalized dihydropyrazoles and tetrahydropyridazines. The reaction is enabled by controllable generation of hydrazonyl radicals
利用烯丙基砜和Morita-Baylis-Hillman加合物作为烯丙基源,开发了一种新型的光催化肼基自由基介导的β,γ-不饱和的环化/烯丙基级联反应。通过氧化去质子电子转移策略可控制地生成肼基自由基,并在可见光照射下选择性捕获所得的以C为中心的自由基,可以实现反应。