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Regiospecific Synthesis of 3-Substituted Imidazo[1,2-a]pyridines, Imidazo[1,2-a]pyrimidines, and Imidazo[1,2-c]pyrimidineKatritzky, Alan R.; Xu, Yong-Jiang; Tu, Hongbin · The Journal of Organic Chemistry · 2003