Catalyst-free cyclization of anthranils and cyclic amines: one-step synthesis of rutaecarpine
作者:Jian Li、Zheng-Bing Wang、Yue Xu、Xue-Chen Lu、Shang-Rong Zhu、Li Liu
DOI:10.1039/c9cc06160f
日期:——
An efficient synthesis of a variety of quinazolinone derivatives via a direct cyclization reaction between commercially available anthranils and cyclic amines is described. The developed transformation proceeds with the merits of high step- and atom-efficiency, a broad substrate scope, and good to excellent yields, without additional catalysts, and offers a practical way for the preparation of rutaecarpine
A visible-light-induced/thiourea-mediated intramolecularcyclization of o-nitroarenes under mild conditions is realized for the first time, which provides an efficient and environmentally friendly way to access pharmaceutical relevant quinazolinone derivatives. The reaction can be easily extended to gram level by using a continuous-flow setup with high efficiency. Mechanistic investigation including