1123837-84-2

Sitravatinib, known as MGCD516, is a multikinase (MET, RET, AXL, NTRK1, or NTRK3 genes) inhibitor used in a phase 1/1b clinical trial (NCT02219711) for patients with advanced cancers (NCT02219711).

MGCD 516 is an intermediate used to prepare substituted thienopyridines as inhibitors of protein tyrosine kinase activity.

Step 2. Synthesis of N-(3-fluoro-4-((2-(5-(((2-methoxyethyl)amino)methyl)pyridin-2-yl)thieno[3,2-b]pyridin-7- yl)oxy)phenyl)-N-(4-fluorophenyl)cyclopropane-1,1 -dicarboxamide (147): Compound 146 (0.59 g, 0.81 mmol) was dissolved in dichloromethane (50 mL) in dichloromethane (50 mL) and trifluoroacetic acid (TFA, 3 mL) was added. The reaction mixture was stirred at room temperature for 18 hours. Upon completion of the reaction, the solution was concentrated to remove the solvent. The residue was partitioned between dichloromethane and 1 M sodium hydroxide solution and filtered to remove insoluble impurities. The organic phase was separated, washed sequentially with 1 M sodium hydroxide solution and saturated brine, dried over anhydrous magnesium sulfate, filtered and concentrated to afford the target compound 147 (0.35 g, 69% yield).1H NMR (400 MHz, DMSO-d6) δ (ppm): 10.40 (s, 1H), 10.01 (s, 1H), 8.55 (d, J = 1.6 Hz 1H), 8.51 (d, J = 5.3 Hz, 1H), 8.31 (s, 1H), 8.22 (d, J = 8.0 Hz, 1H), 7.92-7.87 (m, 2H), 7.65-7.61 (m, 2H), 7.52-7.43 (m, 2H), 7.17-7.12 (m, 2H), 6.64 (d, J = 5.5 Hz, 1H), 3.77 (s, 2H), 3.40 (t, J = 5.7 Hz, 2H), 3.23 (s, 3H), 2.64 (t, J = 5.7 Hz, 2H), 1.46 (br s, 4H). Mass spectrum (m/z): 630.1 (M + H).

Axl: 1.5 nM (IC₅₀); MER: 2 nM (IC₅₀); VEGFR3: 2 nM (IC₅₀); VEGFR2: 5 nM (IC₅₀); VEGFR1: 6 nM (IC₅₀); TrkA: 5 nM (IC₅₀); TrkB: 9 nM (IC₅₀); KIT: 6 nM (IC₅₀); FLT3: 8 nM (IC₅₀); DDR2: 0.5 nM (IC₅₀); DDR1: 29 nM (IC₅₀)

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1) Parag?et al.?(2016)?Significant blockade of multiple receptor kinases by MGCD516 (Sitravatinib), a novel small molecule inhibitor, shows potent anti-tumor activity in preclinical models of sarcoma; Oncotarget?7?4093 2) Leal?et al.?(2017)?Evidence of clinical activity of sitravatinib in combination with nivolumab in NSCLC patients progressing on prior checkpoint inhibitors; J. Thorac. Oncol.?12?S1803 3) Du?et al.?(2018);?Sitravatinib potentiates immune checkpoint blockade in refractory cancer models; JCI Insight?3?124184