Cdk inhibitor and crystal form of pharmaceutically acceptable salt thereof, and use thereof

Abstract

Provided is compound A or a pharmaceutically acceptable salt thereof in a crystalline form. The structure of compound A is represented by formula (I) below. Studies have shown that a crystalline form A-1 of the free base of compound A, crystalline form B of a hydrochloride salt of compound A and crystalline form C of a benzenesulfonate salt of compound A have certain physical stability and chemical stability. The compound A or the pharmaceutically acceptable salt thereof in a crystalline form can significantly inhibit the proliferation of various cells of tumors such as breast cancer, colorectal cancer, ovarian cancer, melanoma, liver cancer, lung cancer and acute myeloid leukemia; and also has a good inhibitory effect on palbociclib-resistant (including primary drug resistance and acquired drug resistance) breast cancer and liver cancer. Therefore, the compound A or the pharmaceutically acceptable salt thereof in a crystalline form has good clinical application prospects in the treatment of advanced malignant tumors, and provides a new drug choice for the treatment of CDK4/6 inhibitor-resistant tumors.

Dependencies are inferred from the claim text.