A convenient oxidative cyclodesulfurization method toward the synthesis of benzofused nitrogen heterocycles using inexpensive and readily available potassium periodate as an oxidant was developed. Upon treating isothiocyanates with ortho-substituted anilines bearing N,N-, N,O-, and N,S-bis-nucleophiles, followed by an intramolecular cyclization of the in situ generated monothioureas, substituted 2-aminobenzazole
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.
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。
Regioselective synthesis and biological evaluation of<i>N</i>-substituted 2-aminoquinazolin-4-ones
the Dimroth rearrangement in aqueous ethanolic sodium hydroxide gave exclusively the regioisomers, 2-(N-arylamino)quinazolin-4-ones. The regioselective synthesis of N-aryl-substituted 2-aminoquinazolin-4-ones can be further applied to the synthesis of benzimidazo[2,1-b]quinazolin-12-ones.
在对-TsOH存在下,在t- BuOH中,在回流下,邻氨基苯甲酸甲酯与N-芳基氰酰胺的反应主要得到3-芳基喹唑啉-4-酮。相比之下,相同的反应物与TMSCl在60°C的t- BuOH中反应,然后在乙醇氢氧化钠水溶液中进行Dimroth重排,仅得到区域异构体2-(N-芳基氨基)喹唑啉-4-酮。N-芳基取代的2-氨基喹唑啉-4-酮的区域选择性合成可以进一步应用于苯并咪唑并[2,1- b ]喹唑啉-12-酮的合成。