作者:Jeffery B. Press、Victor T. Bandurco、Elizabeth M. Wong、Zoltan G. Hajos、Ramesh M. Kanojia、Robert A. Mallory、Edward G. Deegan、James J. Mcnally、Jerry R. Roberts、Mary Lou Cotter、David W. Graden、John R. Lloyd
DOI:10.1002/jhet.5570230643
日期:1986.11
Synthesis of 5,6-dimethoxyquinazolin-2(1H)-one derivatives was the subject of investigations leading to the preparation of title compounds 11, 13, 14 and 26. Target quinazolines 1 were synthesized in three ways; the route starting from o-vanillin via the intermediacy of 6-amino-2,3-dimethoxyacetophenone (19) was used for most of the preparative work. The unexpected formation of an acid-labile dimer
5,6-二甲氧基喹唑啉-2(1 H)-一衍生物的合成是导致制备标题化合物11、13、14和26的研究对象。目标喹唑啉1的合成方法有3种:从邻-香兰素开始,经过6-氨基-2,3-二甲氧基苯乙酮(19)的中间途径,用于大多数制备工作。发现了酸不稳定的二聚体13的意外形成,固态13C nmr用于结构分配。在这些系统中,5-甲氧基取代基显示出异常的光谱特征,在一种情况下,在酸性介质中被裂解为22。