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。
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。
Carbonylation Chemistry Applied to the Synthesis of Benzimidazo[2,1‐
<i>b</i>
]quinazolin‐12‐ones
作者:Sarah Vangrunderbeeck、Tim Balcaen、Cedrick Veryser、Gert Steurs、Wim M. De Borggraeve
DOI:10.1002/ejoc.202101136
日期:2022.1.17
A new syntheticroute towards benzimidazo[2,1-b]quinazolin-12-ones has been developed, which relies on the Pd-catalyzed intramolecular aminocarbonylation of N-(2-bromophenyl)-1H-benzimidazol-2-amines. Using near stoichiometric amounts of 13CO, isotopicallylabelled benzimidazo[2,1-b]quinazolin-12-ones were synthesized.
开发了一种新的苯并咪唑[2,1- b ]喹唑啉-12-酮合成路线,该路线依赖于Pd催化的N- (2-溴苯基) -1H-苯并咪唑-2-胺的分子内氨基羰基化。使用接近化学计量的13 CO,合成了同位素标记的苯并咪唑并[2,1 - b ]喹唑啉-12-酮。
Immunosuppressants
申请人:Eli Lilly and Company
公开号:US04000275A1
公开(公告)日:1976-12-28
Benzimidazo[2,1-b]quinazolin-12(6H)ones, immunosuppressives and agents for treatment of auto-immune diseases, are prepared via (1) reacting a 2-chlorobenzimidazole with an anthranilic acid or ester; (2) reacting a 2-aminobenzimidazole with an anthranilic acid or ester in the presence of trifluoroacetic acid or (3) reacting a 2-methylmercaptobenzimidazole with an anthraniloyl halide hydrohalide.
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
conditions. Triphenylbismuth dichloride promoted the conversion of thioxoquinazolinone to tetracyclic products as an efficient cyclodesulfurization reagent. All the steps in this tandemreaction were performed at room temperature. The present reaction system can also be applied to benzoxazoloquinazolinone synthesis by using 2-aminophenols as the starting material.