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• W2807264512 abstract "A direct one-pot synthesis of chromeno-annulated imidazo[1,2-a]pyridines is achieved by the reaction of 2-amino-1-(2-ethoxy-2-oxoethyl)pyridinium salts with 2-bromoarylaldehydes using Pd(TFA)2 as a catalyst and Cu(OAc)2 as an oxidant. The overall strategy involves tandem base-mediated amidation and Knoevenagel condensation, followed by palladium-catalyzed Wacker type oxidation and intramolecular C–O coupling reaction. The method is simple, tolerates different functional groups, and gives moderate to good yields of chromeno[2′,3′:4,5]imidazo[1,2-a]pyridin-12-one derivatives. The developed tandem reaction was also successfully applied for the synthesis of pyrano-fused imidazo[1,2-a]pyridines by using 3-bromo-3-arylacrylaldehydes." @default.
• W2807264512 created "2018-06-13" @default.
• W2807264512 creator A5029517329 @default.
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• W2807264512 date "2018-06-08" @default.
• W2807264512 modified "2023-10-10" @default.
• W2807264512 title "One-Pot Tandem Amidation, Knoevenagel Condensation, and Palladium-Catalyzed Wacker Type Oxidation/C–O Coupling: Synthesis of Chromeno-Annulated Imidazopyridines" @default.
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• W2807264512 doi "https://doi.org/10.1021/acs.joc.8b00884" @default.
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