Silver-Mediated Oxidative Decarboxylative Intramolecular Asymmetric Radical Cyclization (C<sub>sp3</sub>–C<sub>sp2</sub>) via Memory of Chirality: Access to Circumdatin Alkaloids
作者:Pankaj S. Mahajan、Santosh B. Mhaske
DOI:10.1021/acs.orglett.8b00652
日期:2018.4.6
A novel silver-mediated oxidative decarboxylativeintramolecular asymmetric radical cyclization has been developed to form a Csp3–Csp2 bond via memory of chirality. The application of the process has been demonstrated for the synthesis of the circumdatin class of alkaloids in high enantiopurity with retention of the configuration. The developed protocol is mild and works with an inexpensive silver
Abstract A one-step, convenient approach to the synthesis of 3-aryl-4(3H)-quinazolinones by the reaction of anthranilic acid with triethyl orthoformate in the presence of a catalytic amount of concentrated sulfuric acid has been developed. The possible reaction pathway was proposed.