Add time:09/09/2019 Source:sciencedirect.com
The three-component reaction of ethyl glyoxalate, 2-aminopyridines, and cyclic 1,3-dicarbonyl compounds such as 4-hydroxycoumarin, N,N-dimethylbarbituric acid and 4-hydroxy-6-methyl-2H-pyran-2-one is described for the synthesis of 3-hydroxyimidazo[1,2-a]pyridine zwitterion derivatives.
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