Radical Cyclization of Olefinic Amides through α-C(sp3)–H Functionalization of Ketones under Catalyst-, Ligand-, and Base-Free Conditions
作者:Yiping Ruan、Hongxin Liu、Wen-Ting Wei、Fu-Hua Qin、Qing-Qing Kang、Jun-Yao Zhang、Sen-Jie Hu、Yi Liu、Hongxing Zheng、Yi-Lin Fang
DOI:10.1055/a-1468-5962
日期:2021.6
A new, efficient, and practical radical cyclization of olefinic amides with ketones through α-C(sp3)–H functionalization in the presence of tert-butyl peroxybenzoate (TBPB) is described for the first time. This protocol assembles a wide range of pivotal and useful benzoxazines in good to excellent yields under mild, catalyst-free, ligand-free, and base-free conditions with wide functional group tolerance
首次描述了在过氧苯甲酸叔丁酯(TBPB)存在下,通过α-C(sp3)-H官能化对烯烃酰胺与酮进行的新的,有效的和实用的自由基环化反应。该方案在温和,无催化剂,无配体和无碱条件下,以宽泛的官能团耐受性,以良好至优异的产率组装了各种关键和有用的苯并恶嗪。此外,机理研究表明,α-羰基自由基参与了该转变。