Synthetic studies on KF-alumina-catalysed reaction of substituted and unsubstituted aryl-oxoketene dithioacetals and 1H-pyrazone-5(4H)-one: a convenient synthesis of pyrazolo[3,4-b]pyridine and pyrazolo[1,5-a]pyrimidine

These procedures provide a simple and facile method for the synthesis of pyrazolo[3,4-b]pyridine and pyrazolo[1,5-a]pyrimidine yielding product with more structural diversities. The effects of the solvents and substitution have also been described.