Research ArticleA Facile Synthesis of Pyrido[,:3,4]pyrazolo[1,5-a]pyrimidine and Pyrido[,:3,4]pyrazolo[5,1-c][1,2,4]triazine Bearing a Thiophene Moiety
Scheme 1
Synthetic protocol to achieve the pivotal intermediate pyrazolo[3,4-b]pyridine derivative 11.