CHMFL-ABL-053 (compound 18a) is a BCR-ABL inhibitor with ABL1: IC50 of 70 nM. CHMFL-ABL-053 is derived from a dihydropyrimidopyrimidine core scaffold based compound 27 (GNF 7). [1]

CHMFL-ABL-053 inhibited the proliferation of CML cell lines K562 (GI50 = 14 nM), KU812 (GI50 = 25 nM) and MEG 01 (GI50 = 16 nM), through significant suppression of the BCR-ABL auto phosphorylation (EC50 = 100 nM) and downstream mediators such as STAT5, Crkl and ERK's phosphorylation. In the TEL fused isogenic BaF3 cells, CHMFL-ABL-053 exhibited strong binding ability against BLK, DDR1, DDR2, EPHA8, EphB6, HCK, LCK, p38α and SRC kinases. CHMFL-ABL-053 exhibited an IC50 of 70 nM against ABL1 kinase, inhibited p38α (IC50: 62 nM) and SRC kinase (IC50: 90 nM) by Invitrogen Select Screen biochemical assay. CHMFL-ABL-053 showed less potent to DDR1 (IC50: 292 nM) and DDR2 (IC50: 457 nM). CHMFL-ABL-053 did not exhibit apparent potency against c-KIT kinase (IC50: over 10000 nM). [1]

Pharmacokinetic study showed that CHMFL-ABL-053 had over 4 hours half-life and 24% bioavailability in rats. 50mg/kg/day dosage treatment could almost completely suppress the tumor progression in the K562 cells inoculated xenograft mouse model. As a potential useful drug candidate for CML, 18a is under extensive preclinical safety evaluation now. [1]

Reference:

1.Discovery of 2-((3-Amino-4-methylphenyl)amino)-N-(2-methyl-5-(3-(trifluoromethyl) benzamido)phenyl)-4-(methylamino)pyrimidine-5-carboxamide (CHMFL-ABL-053) as a Potent, Selective, and Orally Available BCR-ABL/SRC/p38 Kinase Inhibitor for Chronic Myeloid Leukemia.J Med Chem. 2016 Feb 5. [Epub ahead of print]