A copper‐catalyzed chelation‐assisted ortho‐nitration reaction of aryl derivtives has been achieved, using benzazoles as efficient directing groups. The reaction is general and efficient for aryl derivatives with various electronic properties, and also with different pharmacophorically important directing groups, i.e., benzoxazoles, benzothiazoles, and benzimidazoles. The nitro‐group‐containing products have significance as fluorogenic compounds and potential nitroreductase substrates that could be used for the detection of clinically important microorganisms. The nitration reaction proceeds with an inexpensive copper catalyst and a mild, cheap, and environmentally friendly nitro source, Fe(NO3)3·9H2O. This operationally simple and functional‐group‐tolerant protocol for the nitration of 2‐aryl benzazoles proceeds with a high regioselectivity without the exclusion of air or moisture.
An unprecedented copper-catalyzed in situ azidation-oxidation for the nitration of anilides and sulfonamides has been developed by direct C-H functionalization. This novel and efficient nitration protocol is achieved employing TMSN and TBHP without the exclusion of air or moisture. The synthetic applications of the 2-nitroanilides have been explored.
Iron catalyzed site selective and chelation assisted C-H functionalization in 8-amidoquinolines is achieved. The remote C5-benzoxylation with benzoyl peroxide produced a variety of potentially bioactive 8-arylcarboxamido-5-benzoyloxy quinoline derivatives. The efficiency of the reaction reflects from the wide substrate scope with electronic differentiation on carboxamide and acyl peroxide in addition to tolerance of halo-substitutions on either of the aryls. The reaction is additive, silver free and proceeds without the exclusion of air or moisture.
A one-pot three-component reaction of o-formyl carbamate, a primary amine, a nucleophile (1H-indole or 2-napthol) in water generated a variety of functionalised 3,4-dihydroquinazolin-2(1H)-one derivatives.
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