Acetic Acid → 1207830-66-7

Temperature

22 °C

Tetrabutylammonium fluoride 1M in THF (5.11 mL, 5.11 mmol) was added to (2S)-2-(1-(2-chloro-6-cyanophenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yloxy)-N-(5-methylpyrazin-2-yl)-3-((R)-1-(triisopropylsilyloxy)propan-2-yloxy)propanamide (Intermediate AZ1) (3.4 g, 5.11 mmol) and acetic acid (0.307 g, 5.11 mmol) in THF (35 mL). The resulting solution was stirred at 22° C. for 20 hours. It was quenched with NH4Cl solution (sat., 25 mL) and diluted with EtOAc (50 mL). The organic phase was washed with saturated sodium bicarbonate (25 mL), water (20 mL), brine (20 mL), dried (MgSO4) and evaporated. 6 The crude product was purified by flash silica chromatography, eluting with EtOAc to afford the product (2.23 g, 85%). This was crystallised from EtOAc (10 mL) and iso-hexane (6 mL) to give the desired product as a white crystalline powder (1.9 g, 73%) confirmed to be of the same crystalline form as that described previously.

1. customIt was quenched with NH4Cl solution (sat., 25 mL)
2. additiondiluted with EtOAc (50 mL)
3. washThe organic phase was washed with saturated sodium bicarbonate (25 mL), water (20 mL), brine (20 mL)
4. dry with materialdried (MgSO4)
5. customevaporated
6. custom6 The crude product was purified by flash silica chromatography
7. washeluting with EtOAc

ORD record

ord-278d1abecdfb407e9a332b9053719e5e

Source dataset

uspto-grants-2011_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08071608B2