Triethylamine → (S)-N-(3-chloropropyl)-5-(1-(5-fluoro-2-methoxypyridin-3-yl)-2-hydroxyethylamino)pyrazolo[1,5-a]pyrimidine-3-carboxamide

To a suspension of (S)-5-(1-(5-fluoro-2-methoxypyridin-3-yl)-2-hydroxyethylamino)pyrazolo[1,5-a]pyrimidine-3-carboxylic acid (50 mg, 0.14 mmol) in DCM (2 mL) was added HOBt (44 mg, 0.29 mmol) followed by EDCI (83 mg, 0.43 mmol). The heterogeneous mixture was stirred at ambient temperature for 10 minutes then treated with triethylamine (100 μL, 0.72 mmol) followed by 3-chloro-propylamine hydrochloride (56 mg, 0.43 mmol). The mixture was stirred for 2 hours, then DMF (2 mL) was added and stirring was continued for 48 hours. The mixture was partitioned between saturated NH4Cl solution (20 mL) and EtOAc (20 mL) and the layers were separated. The aqueous layer was extracted with EtOAc (2×10 mL) and the combined organic phases were washed with water (5×10 mL) and brine (10 mL), then dried over Na2SO4, filtered and concentrated to afford (S)-N-(3-chloropropyl)-5-(1-(5-fluoro-2-methoxypyridin-3-yl)-2-hydroxyethylamino)pyrazolo[1,5-a]pyrimidine-3-carboxamide (60 mg, 99% yield) as a pale yellow foam which was used without further purification. MS (apci) m/z=423.0 (M+H).

1. stirringThe mixture was stirred for 2 hours
2. stirringstirring
3. waitwas continued for 48 hours
4. customThe mixture was partitioned between saturated NH4Cl solution (20 mL) and EtOAc (20 mL)
5. customthe layers were separated
6. extractionThe aqueous layer was extracted with EtOAc (2×10 mL)
7. washthe combined organic phases were washed with water (5×10 mL) and brine (10 mL)
8. dry with materialdried over Na2SO4
9. filtrationfiltered
10. concentrationconcentrated

ORD record

ord-13c923ea366c42afb471427bbc647b59

Source dataset

uspto-grants-2015_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08933084B2