“…In the present research, we will highlight the most important aspect of pyrazolopyrimidines, in particular, pyrazolo[3,4‐ d ]pyrimidines bioisosteres of purines. Pyrazolo[3,4‐ d ]pyrimidines are reported to have various pharmacological activities viz., antiviral, anticoccidials, antimicrobial antitumor, herbicidal, antileukemic, CNS agents, tuberculostatic, antileishmanial, anti‐inflammatory and cardiovascular activities. They are also mainly found to show variable degrees of anticancer activities against HCC, cervical carcinoma, colon carcinoma, skin carcinoma, and breast adenocarcinoma, by inhibiting different types of enzymes such as EGFR‐TK, CDK, B‐Raf kinase, Src and Abl tyrosine kinase, and glycogen synthase kinase‐3 …”