A sonochemical method for the synthesis of 2-aminobenzimidazoles and 2-aminobenzoxazoles, as well as chiral aminooxazolines and a chiral substituted quinazolin-5-one is reported. Using the Ph3P–I2 system in the presence of triethylamine as a desulfurization agent, monothioureas prepared in situ from the reaction of bis-nucleophiles with isothiocyanates underwent rapid cyclization to afford a variety
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.
Novel Synthesis of 2-Aminobenzimidazoles from Isoselenocyanates
作者:Yuanyuan Xie、Fan Zhang、Jianjun Li、Xiangjun Shi
DOI:10.1055/s-0029-1219395
日期:2010.4
An efficient one-pot procedure for the synthesis of 2-aminobenzimidazoles from isoselenocyanates and various substituted diamines is described. Precipitation of elemental selenium from the reaction mixture greatly simplifies the purification procedure and also allows it to be re-used for preparation of isoselenocyanates. A possible mechanism for the formation of 2-aminobenzimidazoles is proposed.
One-Pot Synthesis of Five and Six Membered N, O, S-Heterocycles Using a Ditribromide Reagent
作者:Ramesh Yella、Bhisma K. Patel
DOI:10.1021/cc100124q
日期:2010.9.13
In a one-pot procedure, bromine less brominating reagent 1,1′-(ethane-1,2-diyl)dipyridinium bistribromide (EDPBT) has been utilized as an efficient desulfurizing agent for the construction of a library of heterocycles containing N, O, and S starting from aryl/alkyl isothiocyanates. In this approach, aryl/alkyl isothiocyanate reacts with o-phenylenediamine (o-PD), o-aminophenol, and o-aminothiophenol