A Facile Synthesis of Pyrido[2^′,3^′:3,4]pyrazolo[1,5-a]pyrimidine and Pyrido[2^′,3^′:3,4]pyrazolo[5,1-c][1,2,4]triazine Bearing a Thiophene Moiety

Figure 1

Chemical structures of Viloxazine (I), Etazolate (II), and Glicaramide (III).