苯并[4,5]咪唑并[2,1 - b ]喹唑啉-12-one和苯并[4,5]咪唑并[1,2- a ]吡啶[2,3 - d ]嘧啶-5-酮N-酰化–S N Ar反应
摘要:
有效合成苯并[4.5]咪唑并[2,1 - b ]喹唑啉-12-one和苯并[4,5]咪唑并[1,2- a ]吡啶[2,3 - d ]嘧啶-5-酮是报道了2-氨基苯并咪唑与2-卤代芳酰氯的反应。该反应利用2-氨基苯并咪唑中亲核中心的1,3-位和酰基氯中亲电位点的相似排列来组装中心六元环。在-10°C的DMF中,在NaHCO 3(2当量)存在下,用酰氯(1当量)对2-氨基苯并咪唑(1.2当量)进行初始处理,在饱和苯并咪唑氮原子上进行酰化反应。随后在同一反应容器中加热至75°C,然后通过S N完成合成Ar环由C2氨基封闭。该反应适用范围广,两步反应产率为76-98%。最终产物以互变异构平衡存在,其可以被N6处的酰化作用阻断。
Copper-Catalyzed Domino Synthesis of Benzimidazo[2,1-b]quin- azolin-12(6H)-ones Using Cyanamide as a Building Block
作者:Daoshan Yang、Yuyuan Wang、Haijun Yang、Tao Liu、Hua Fu
DOI:10.1002/adsc.201100580
日期:2012.2
A convenient copper-catalyzeddomino method for the synthesis of benzimidazo[2,1-b]quinazolin-12(6H)-ones has been developed via reactions of readily available substituted 2-bromo-N-(2-halophenyl)benzamides with cyanamide, in which cyanamide acts as a useful buildingblock.
通过容易获得的取代的2-溴-N-(2-卤代苯基)苯甲酰胺与苯的反应,开发了一种方便的铜催化多米诺骨牌合成苯并咪唑并[2,1 - b ]喹唑啉-12(6 H)-酮的方法。氰酰胺,其中氰酰胺可作为有用的结构单元。
Divergent Approach for Regioselective Synthesis of Linearly and Angularly Fused Benzoimidazoquinazolinones from Isatoic Anhydrides
regioselective syntheses of a wide range of linearly and angularly fused benzoimidazoquinazolinones. The selectivity of the products relies on the generation of either highly electrophilic oxyphosphonium or less reactive imidate intermediates. A direct amine attack at the C-2 position of the oxyphosphonium intermediate presumably drives the reaction toward the linearly fused products, whereas an attack of