Supercritical methanol as solvent and carbon source in the catalytic conversion of 1,2-diaminobenzenes and 2-nitroanilines to benzimidazoles
作者:Zhuohua Sun、Giovanni Bottari、Katalin Barta
DOI:10.1039/c5gc01040c
日期:——
Benzimidazoles and N-methylbenzimidazoles were synthesized by simply heating 1,2-diaminobenzenes in supercritical methanol over copper-doped porous metal oxides.
苯并咪唑和N-甲基苯并咪唑是通过在掺铜多孔金属氧化物中超临界甲醇中加热1,2-二氨基苯合成的。
Efficient N‐Heterocyclic Carbene/Ruthenium Catalytic Systems for the Alcohol Amidation with Amines: Involvement of Poly‐Carbene Complexes?
atom‐economic direct amidation of alcohols with amines has been recently highlighted as an attractive and promising transformation. Among the versatile reported catalytic systems, in situ generated N‐heterocycliccarbene (NHC)/ruthenium (Ru) catalytic systems have demonstrated their advantages such as easy operation and use of commercial Ru compounds. However, the existing catalyst loadings are relatively
Benzimidazole- and benzothiazole-quinones: excellent substrates for NAD(P)H:quinone oxidoreductase 1
作者:Jeffery J. Newsome、Marie A. Colucci、Mary Hassani、Howard D. Beall、Christopher J. Moody
DOI:10.1039/b713044a
日期:——
benzimidazole- and benzothiazole-quinones has been synthesized. The ability of these heterocyclic quinones to act as substrates for recombinant human NAD(P)H:quinone oxidoreductase (NQO1), a two-electron reductase upregulated in tumour cells, was determined. Overall, the quinones were excellent substrates for NQO1.
The three-component reaction of a benzimidazole with an α,β-acetylenic γ-hydroxy nitrile and water in acetonitrile at 20-25 ˚C for seven days or at 45-50 ˚C for six hours results in cleavage of the imidazole ring to afford the corresponding (2-[(3E)-5-aminofuran-3(2H)-ylidene]amino}phenyl)formamide exclusively in 84-99% yield. The synthesisinvolves multipositional cascade transformations of the intermediate