(S)-tert-Butyl 4-(1-cyano-2-(4-(3-methyl-2-oxo-2,3-dihydrobenzo[d]oxazol-5-yl)phenyl)ethylcarbamoyl)tetrahydro-2H-pyran-4-ylcarbamate → (S)-4-Amino-N-(1-cyano-2-(4-(3-methyl-2-oxo-2,3-dihydrobenzo[d]oxazol-5-yl)phenyl)ethyl)tetrahydro-2H-pyran-4-carboxamide

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Reaction Steps

(S)-tert-Butyl 4-(1-cyano-2-(4-(3-methyl-2-oxo-2,3-dihydrobenzo[d]oxazol-5-yl)phenyl)ethylcarbamoyl)tetrahydro-2H-pyran-4-ylcarbamate (Example 17, step (ii), 145 mg) (crude mixture) was dissolved in formic acid (3 mL) and the mixture stirred at room temperature for 18 h. The mixture was evaporated to dryness, dissolved in methanol (10 mL), re-evaporated to dryness, dissolved in methanol/acetonitrile 50:50 (4 mL) and purified on reversed phase HPLC eluting with methanol in 0.1% aqueous TFA on a Water's SunFire column. The material was converted to free base by evaporating the relevant fractions, dissolving in ethyl acetate (20 mL) and shaking with saturated aqueous sodium bicarbonate solution (20 mL). The sodium bicarbonate was further extracted with ethyl acetate (20 mL). The combined extracts were dried over magnesium sulfate and evaporated to afford the titled compound (47 mg).

Provenance & Evidence