Synthesis of 1-Acyl-3,4-dihydroquinazoline-2(1<i>H</i>)-thiones by Cyclization of<i>N</i>-[2-(Isothiocyanatomethyl)phenyl] Amides Generated<i>in situ</i>from<i>N</i>-[2-(Azidomethyl)phenyl] Amides
作者:Kazuhiro Kobayashi、Naoki Matsumoto
DOI:10.1002/hlca.201400078
日期:2014.7
An efficient method for the preparation of 1‐acyl‐3,4‐dihydroquinazoline‐2(1H)‐thiones 5 has been developed. The reaction of N‐[2‐(azidomethyl)phenyl] amides 3, easily prepared by a three‐step sequence starting with (2‐aminophenyl)methanols, with Ph3P, followed by CS2, allowed generation of N‐[2‐(isothiocyanatomethyl)phenyl]‐amide intermediates 4, which underwent cyclization on treatment with NaH to