Acetic Acid → HCID 86708575, compound

Participants

Reaction Steps

To a suspension of 2-((2-chloro-5-cyano-3-(piperidin-4-yl)phenyl)amino)-4-(cyclopropylamino)imidazo[2,1-f][1,2,4]triazine-7-carbonitrile (Example 208)(60 mg, 0.138 mmol) in a mixture solvent of methanol (0.7 ml)/CH2CL2 (0.7 ml) was added trimethyl orthoformate (0.7 mL, 6.33 mmol), (The suspension converted to a clear solution within 1 min.), tert-butyl 3-oxoazetidine-1-carboxylate (237 mg, 1.383 mmol), and acetic acid (0.032 mL, 0.553 mmol). The mixture was stirred at Rt for 40 min and then sodium cyanoborohydride (87 mg, 1.383 mmol) was added and stirred at room temperature for overnight. The reaction mixture was partitioned between EtOAc and diluted aq. NaHCO3, The aqueous layer was extracted with EtOAc; the combined organic layer was washed with brine and concentrated. The crude intermediate was purified by prep HPLC (100×30 mm Luna C18 column, Solvent A=10% Methanol, 90% H2O, 0.1% TFA; solvent B=90% Methanol, 10% H2O, 0.1% TFA, Flow rate 42 ml per min, 20-100% B, over 20 min). The HPLC fractions containing the intermediate were applied onto a cartridges of Phenomenex Strata-X-C 33 um cation mixed-mode polymer. This was washed with methanol and product was eluted with 2 N solution of ammonia in methanol/DCM (1:1). Removal of the solvents left 46 mg intermediate as a white solid which was dissolved in DCM (2 ml) and TFA (1 ml) was added. The resulting mixture was stirred at room temperature for 0.5 hour. Removal of the solvent and the residue was taken in MeOH/DCM and applied onto a cartridges of Phenomenex Strata-X-C 33 um cation mixed-mode polymer. This was washed with methanol and product was eluted with 2 N solution of ammonia in methanol/DCM (1:1). Removal of the solvents left the product (39 mg) as a white solid

Provenance & Evidence