L-Proline Triflate as an Efficient and Reusable Catalyst for the One-Pot Synthesis of 2,4,5-Trisubstituted Imidazoles and 1,2,4,5-Tetrasubstituted Imidazoles
作者:Jianjun Li、Shouwang Lin、Jiajia Dai、Weike Su
DOI:10.3184/030823410x12698803608765
日期:2010.4
L-Proline triflate has been used as an efficient catalyst for an improved and rapid one-potsynthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstitutedimidazoles in good yields. The benefit of this approach is its operational simplicity and the catalyst can be easily recovered and reused without any loss of activity.
novel, highly efficient, and one-pot microwave-assisted synthesis of 2,4,5-trisubstitutedimidazoles using a newly developed Schiff’s base complex nickel catalyst (Ni-C) is described. The approach involves the reaction of various aldehydes with benzil and ammonium acetate in the presence of the Ni-C catalyst to furnish cyclized products in excellent yields. The Ni-C catalyst exhibited remarkable catalytic
Direct synthesis of 2,4,5-trisubstituted imidazoles from primary alcohols by diruthenium(<scp>ii</scp>) catalysts under aerobic conditions
作者:Saranya Sundar、Ramesh Rengan
DOI:10.1039/c8ob02785d
日期:——
report a straightforward synthetic approach to 2,4,5-trisubstituted imidazoles from readily available primary alcohols using arene diruthenium(II) catalysts. Dinuclear arene ruthenium complexes have been synthesized and structurally characterized with the aid of analytical and spectral techniques. A library of 2,4,5-trisubstituted imidazoles was achieved with a yield up to 95% by loading 0.25 mol% of the
ZrO<sub>2</sub>-β-cyclodextrin catalyzed synthesis of 2,4,5-trisubstituted imidazoles and 1,2-disubstituted benzimidazoles under solvent free conditions and evaluation of their antibacterial study
作者:Yarabhally R. Girish、Kothanahally S. Sharath Kumar、Kuntebommanahalli N. Thimmaiah、Kanchugarakoppal S. Rangappa、Sheena Shashikanth
DOI:10.1039/c5ra13891d
日期:——
A series of 2,4,5-trisubstituted imidazoles and 1,2-disubstituted benzimidazoles catalyzed by ZrO2-supported-β-cyclodextrin (ZrO2-β-CD) under solvent free conditions have been synthesized and characterized by spectral methods.
practical aerobic benzylic sp3 C–H oxidation as a key step towards the domino multi-component synthesis of 2,4,5-trisubstituted imidazoles has been reported. This green methodology employs an inexpensive catalytic copper/oxygen system and proceeds under mild reaction conditions. A variety of substituted imidazoles are prepared in moderate to excellent yields from α-methylene ketones using this innovative