四氢萘酮与腈的反应:合成新的取代苯并[ h ]喹唑啉,苯并[ f ]喹唑啉和二苯并[ a,i ]菲啶的简单方法
摘要:
在三氟甲磺酸酐存在下,1-四氢萘酮与腈的一锅法反应可提供高收率的2,4-二取代的5,6-二氢苯并[ h ]喹唑啉,用DDQ氧化可得到相应的苯并[ h ]喹唑啉。2-Tetralone经历相同的过程,形成1,3-二取代的5,6-二氢苯并[ f ]喹唑啉。然而,当2-四氢萘酮与甲基硫氰酸酯作为腈进行反应时,以高收率分离出5-甲基硫基四氢二苯并[ a ] ,i,菲啶。甲硫基的轻松转化为获得各种取代的二苯并[ a,i ]菲啶提供了可能。
Four-component quinazoline synthesis from simple anilines, aromatic aldehydes and ammonium iodide under metal-free conditions
作者:Jinjin Chen、Dan Chang、Fuhong Xiao、Guo-Jun Deng
DOI:10.1039/c8gc02654h
日期:——
A four-component procedure for the preparation of substituted quinazolines from anilines, aromaticaldehydes and ammonium iodide is described. The C–H bond ortho to the amino group in anilines was directly functionalized undermetal-freeconditions. Two aldehydes were involved in this reaction and ammonium iodide was used as one of the nitrogen sources. This reaction provides a strategy for the facile
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