bioisosteres of adenine, which is fundamental for every aspect of cell life. Pyrazolo [3, 4-d]
pyrimidines derivatives have been explored for their inhibitory activity towards various
protein kinase enzymes and their role as anticancer agents. The present review to the best
of our knowledge is the first compilation on synthesis and medicinal aspects including
structure–activity relationships of pyrazolo [3, 4-d] pyrimidines reported to date.