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
Preparation of Functional Benzofurans, Benzothiophenes, and Indoles Using Ester, Thioester, and Amide via Intramolecular Wittig Reactions
作者:Siang-en Syu、Yu-Ting Lee、Yeong-Jiunn Jang、Wenwei Lin
DOI:10.1021/ol201062r
日期:2011.6.3
Preparation of new types of highly functional benzofurans, benzothiophenes, and indoles is realized via intramolecular Wittig reactions with the corresponding ester, thioester, and amide functionalities. The key intermediates, phosphorus ylides, presumably result from the addition of Bu3P toward aldehydes followed by acylation and deprotonation. Synthesis of functional benzofurans directly starting