Tetrabutylammonium Fluoride → (2S)-2-(1-(2-chlorophenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yloxy)-3-(3-hydroxyazetidin-1-yl)-N-(5-methylpyridin-2-yl)propanamide

Tetrabutylammonium fluoride (1M in THF) (1.515 mL, 1.51 mmol) was added to (2S)-3-(3-(tert-butyldimethylsilyloxy)azetidin-1-yl)-2-(1-(2-chlorophenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yloxy)-N-(5-methylpyridin-2-yl)propanamide (Intermediate AD7) (0.9 g, 1.51 mmol) in THF (10 mL) under nitrogen. The resulting mixture was stirred at ambient temperature for 2.5 hours. The reaction mixture was quenched with saturated NH4Cl, diluted with DCM and poured onto a phase separator. The organic layer was evaporated to a gum. The crude product was purified by flash silica chromatography, elution gradient 0 to 10% MeOH in EtOAc to afford the product (0.313 g, 43.1%, 98% ee). 1H NMR (400 MHz, CDCl3) δ 2.29 (3H, s), 2.50-2.78 (1H, m), 3.15-3.31 (4H, m), 3.79-3.89 (2H, m), 4.47-4.55 (1H, m), 5.91 (1H, t), 7.42-7.56 (4H, m), 7.59-7.65 (1H, m), 8.08-8.14 (2H, m), 8.37 (1H, s), 8.59 (1H, s), 9.53 (1H, s); m/z (ES+) (M+H)+=480.41; HPLC tR=1.19 min.

1. customThe reaction mixture was quenched with saturated NH4Cl
2. additiondiluted with DCM
3. additionpoured onto a phase separator
4. customThe organic layer was evaporated to a gum
5. customThe crude product was purified by flash silica chromatography, elution gradient 0 to 10% MeOH in EtOAc
6. customto afford the product (0.313 g, 43.1%, 98% ee)

ORD record

ord-dad5cba79a9f4148976f307145a7eee7

Source dataset

uspto-grants-2012_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08143263B2