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Green, highly efficient, three-component syntheses of thiazolo-[3,2-a]pyridine derivatives via reaction of malononitrile, aromatic aldehydes, and 2-mercaptoacetic acid with a catalytic amount of piperidine without solvent with molar ratios of 2:2:1.2 and 2:2.2:1, respectively, has been reported.
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Mekheimer et al. (2011) studied this question.
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