Synthesis of Some Pyrido[2,3-d]pyrimidine and Pyrido[3,2-d]pyrimidine Derivatives Synthese einiger Pyrido[2,3-d]pyrimidin- und Pyrido[3,2-d]pyrimidin-Derivate
Synthesis of Some Pyrido[2,3-d]pyrimidine and Pyrido[3,2-d]pyrimidine Derivatives Synthese einiger Pyrido[2,3-d]pyrimidin- und Pyrido[3,2-d]pyrimidin-Derivate