PYRAZOLOPYRIMIDINE DERIVATIVE, USE THEREOF AND PHARMACEUTICAL COMPOSITION

Disclosed is a pyrazolopyrimidine derivative having a structure represented by general formula (I), a pharmaceutically acceptable salt, hydrate and metabolite formed by metabolism in any form thereof, and use in preparing drugs for preventing and/or treating indications associated with JAK kinase function, and a pharmaceutical composition prepared therefrom for preventing and/or treating indications associated with JAK kinase function. The present disclosure is a selective JAK kinase inhibitor, which has a pharmaceutical therapeutic effect on immunity and inflammatory responses by acting on JAK kinase.