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
Desulfurization Mediated by Hypervalent Iodine(III): A Novel Strategy for the Construction of Heterocycles
作者:Harisadhan Ghosh、Ramesh Yella、Jayashree Nath、Bhisma K. Patel
DOI:10.1002/ejoc.200800901
日期:2008.12
The desulfurization ability of diacetoxyiodobenzene (DIB) has been explored in the preparation of isothiocyanates from the corresponding dithiocarbamate salts. The in situ generated isothiocyanates reacted with o-phenylenediamine and o-aminophenol to form monothioureas, which, on treatment with a further equivalent of DIB in one pot, gave benzimidazoles and aminobenzoxazoles, respectively. Aliphatic
A one-pot method for the synthesis of 2-aminobenzimidazoles and related heterocycles
作者:Victor J. Cee、Nicholas S. Downing
DOI:10.1016/j.tetlet.2006.03.112
日期:2006.5
A rapid and efficient one-pot method for the synthesis of 2-aminobenzimidazoles and related heterocycles is described. The reaction is mediated by a polymer-supported carbodiimide, which simplifies product isolation. The scope and limitations of this method are described.
[EN] PROCESS FOR PREPARING 2-ARYLAMINO OR HETEROARYLAMINO SUBSTITUTED BENZIMIDAZOLE COMPOUNDS<br/>[FR] PROCÉDÉ POUR LA PRÉPARATION DE COMPOSÉS DE BENZIMIDAZOLE SUBSTITUÉS PAR 2-ARYLAMINO OU HÉTÉROARYLAMINO
申请人:SANOFI AVENTIS US LLC
公开号:WO2011019781A1
公开(公告)日:2011-02-17
The present invention is related to a process for preparing 2-arylamino or heteroarylamino substituted benzimidazole compounds.
Copper-Promoted One-Pot Approach: Synthesis of Benzimidazoles
作者:S. N. Murthy Boddapati、Ramana Tamminana、Ravi Kumar Gollapudi、Sharmila Nurbasha、Mohamed E. Assal、Osamah Alduhaish、Mohammed Rafiq H. Siddiqui、Hari Babu Bollikolla、Syed Farooq Adil
DOI:10.3390/molecules25081788
日期:——
first time on a copper catalyst promoted domino C–N cross-coupling reaction for the generation of 2-arylaminobenzimidazoles. Mechanistic investigations revealed that the synthetic pathway involves a copper-based desulphurization/nucleophilicsubstitution and a subsequent domino intra and intermolecular C–N cross-coupling reactions. Some of the issues typically encountered during the synthesis of 2