Water-Mediated Synthesis of 2-Substituted Benzimidazoles by Boric Acid and Glycerol
作者:Chhanda Mukhopadhyay、Pradip Kumar Tapaswi、Ray J. Butcher
DOI:10.1071/ch08309
日期:——
A very simple, mild, and highly efficient green catalyst has been developed for the synthesis of 2-substituted benzimidazoles by treatment of substituted ortho-phenylenediamines and aldehydes in water at 80°C in the presence of boric acid (5 mol-%) and glycerol (0.05 mL). This methodology has been standardized on 55 substrates, and nine new compounds have been synthesized.
N-Methylthiomethylation of benzimidazoles with DMSO and their chemoselective oxidation to sulfoxides with NaBiO3
作者:Chhanda Mukhopadhyay、Pradip Kumar Tapaswi、Swarbhanu Sarkar、Michael G. B. Drew
DOI:10.3998/ark.5550190.0012.929
日期:——
for the N-methylthiomethylation of benzimidazoles has been developed employing DMSO as a solvent and as a reagent. This methodology has been applied for the synthesis of diverse N-methylthiomethyl derivatives of benzimidazoles. The products can be chemoselectively oxidized to the corresponding sulfoxides with NaBiO3 in acetic acid. Both the N-methylthiomethyl derivatives of benzimidazoles and their