Synthesis of polybenzoquinazolines via an intramolecular dehydration of photocyclization
作者:Wei Wei、Chenchen Li、Tao Wang、Dian Liu、Zunting Zhang
DOI:10.1016/j.tet.2016.04.080
日期:2016.8
intramolecular dehydration of photocyclization. The intermediates were obtained by the condensation of 3-arylchromone with formamidine, acetamidine or guanidine refluxing in ethanol, respectively. Irradiation of the corresponding intermediates by a high-pressure mercury lamp in 19:1 (v/v) EtOHH2O or 18:1:1 (v/v) EtOHH2O-Dioxane lead to target products. This photocyclization showed advantages including
苯并[ ħ ] -naphth [1,2 ˚F ]喹唑啉和苯并[ ħ ] -phenanthren [9,10- ˚F ] quinazoines从中间体合成4-(2-羟基苯基)-5-(萘-1-基)嘧啶和4-(2-羟基苯基)-5-(菲基-1-基)嘧啶通过分子内脱水作用而光环化。通过使3-芳基色酮与甲am,乙am或胍在乙醇中回流分别缩合获得中间体。高压汞灯以19:1(v / v)EtOH H 2 O或18:1:1(v / v)EtOH H 2辐照相应的中间体邻二恶烷导致目标产品。该光环化显示出包括无催化剂和温和的反应条件的优点。此外,水是该反应的唯一副产物。测定了2-氨基-12-甲氧基-苯并[ h ]-萘并[1,2- f ]喹唑啉的晶体结构,并研究了这些聚苯并喹唑啉的荧光性质。