- Metal-free C(sp2)-H functionalization of azoles: K2CO3/I2-mediated oxidation, imination, and amination
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The direct C2-H oxidation and imination of a wide variety of azoles was achieved by using a commercially available simple K2CO3/I2 reagent combination. The iodinated azole adduct, produced via the in situ generation of N-heterocyclic carbene, is the key intermediate for C2-H oxidation, imination, and amination of azoles. Significantly, these reactions proceed under mild conditions with high to excellent yields, are scalable to large quantity and exhibit a broad substrate scope. Interestingly, this direct C2-H imination method allowed us to access various pharmacologically active N6-alkyl or N6-aryl substituted benzimidazoquinazolinone scaffolds through intramolecular C-H imination in a sequential one-pot reaction.
- Das, Ranajit,Banerjee, Mainak,Rai, Rakesh Kumar,Karri, Ramesh,Roy, Gouriprasanna
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supporting information
p. 4243 - 4260
(2018/06/22)
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- Isoindolinone pigments and process for their manufacture
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Isoindolinone pigments of the formula STR1 WHEREIN R represents an aliphatic or cycloaliphatic radical, a cycloaliphatic, aromatic or heterocyclic radical to which the oxygen atoms are attached through alkyl or alkoxy groups, V1 and V2 represent hydrogen or halogen atoms, alkyl or alkoxy groups of 1 to 4 carbon atoms, X represents a halogen atom, Y and Z represent halogen atoms, alkoxy or alkylmercapto groups of 1 to 6 carbon atoms, cycloalkoxy groups of 5 to 6 carbon atoms, aralkoxy, aryloxy or arylmercapto groups, and n is an integer from 2 to 6, are valuable pigments coloring plastics, lacquers and printing inks in various yellow shades of excellent fastness properties and high color strength.
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- Halogen-substituted benzimidazolone compounds
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New chlorinated and/or brominated N,N'-substituted benzimidazolones are obtained by reacting N,N'-substituted benzimidazolones with chlorine or bromine. The new chlorine-containing and/or bromine-containing benzimidazolone compounds are suitable for the production of heat-stable, flame-resistant polymers.
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