One-pot synthesis of 4-substituted 4-alkoxy-1,4-dihydro-3,1-benzoxazine-2-thiones by the reaction of 2-isothiocyanatobenzoates with organolithiums
作者:Kazuhiro Kobayashi、Hiroo Hashimoto、Yuuki Kanbe、Hisatoshi Konishi
DOI:10.1016/j.tet.2011.04.088
日期:2011.6
An efficient one-pot procedure for the preparation of 4-substituted 4-alkoxy-1,4-dihydro-3,1-benzoxazine-2-thiones from 2-isothiocyanatobenzoates has been developed. Thus, 2-isothiocyanatobenzoates were reacted with organolithiums including lithium enolates of acetates and tertiary acetamides in THF at -78 degrees C to give the desired products in generally good yields. (C) 2011 Elsevier Ltd. All rights reserved.