Grindstone chemistry: protic ionic liquid-substrate tuned green synthesis of 1,2-disubstituted and 2-substituted benzimidazoles with outstanding selectivity
作者:Swapan Majumdar、Mithun Chakraborty、Nabyendu Pramanik、Dilip K. Maiti
DOI:10.1039/c5ra08183a
日期:——
environmentally benign and highly catalyst-substrate controlled synthesis of 1,2-disubstituted and 2-substituted benzimidazoles with outstanding selectivity has been developed through grinding a mixture of o-phenylenediamines, suitable aldehydes and an imidazolium trifluoroacetate proticionicliquid catalyst. The newly developed metal-free catalysis approach produced 1,2-disubstituted benzimidazoles from
An efficient strategy for N-alkylation of benzimidazoles/imidazoles in SDS-aqueous basic medium and N-alkylation induced ring opening of benzimidazoles
作者:Ankita Chakraborty、Sudipto Debnath、Tanmoy Ghosh、Dilip K. Maiti、Swapan Majumdar
DOI:10.1016/j.tet.2018.08.029
日期:2018.10
alkyl halides reaction proceeds at ambient temperature whereas in the cases of less reactive alkyl halides require 55–60 °C to complete alkylation process. N-alkylation induced ring opening of the heterocyclicring in benzimidazole derivatives to multifunctional aromaticcompounds were noticed at 60 °C when more than two equivalents of alkyl halide was used.