Preparation of Quinazolines via a 2+2+2 Annulation from Aryldiazonium Salts and Nitriles
作者:Mani Ramanathan、Shiuh-Tzung Liu
DOI:10.1021/acs.joc.7b01325
日期:2017.8.4
A (2+2+2) modular synthesis of multisubstituted quinazolines has been realized by the direct reaction of aryldiazonium salts with two equivalent of nitriles. Reaction of aryldiazonium salt with a nitrile provides the initial formation of a reactive nitrilium ion, which is attacked by another molecule of nitrile followed by electrophilic cyclization to deliver the desired product. Notable flexibility
通过芳基重氮盐与两个当量腈的直接反应,实现了多取代喹唑啉的(2 + 2 + 2)模块化合成。芳基重氮盐与腈的反应提供了反应性腈离子的初始形成,该离子被另一种腈分子攻击,随后进行亲电环化以提供所需的产物。该方法的优点是取代模式具有显着的灵活性,易于获得的底物,反应时间短,无过渡金属和克级合成。