Tetrabutylammonium Fluoride → HCID 57504418, compound

Participants

Reaction Steps

Tetrabutylammonium fluoride (1M in THF) (0.973 mL, 0.97 mmol) was added to (2S)-3-((R)-1-(tert-butyldimethylsilyloxy)propan-2-yloxy)-2-(1-(3-chloropyridin-2-yl)-1H-pyrazolo[3,4-d]pyrimidin-4-yloxy)-N-(5-cyanopyridin-2-yl)propanamide (Intermediate AN3) (395 mg, 0.65 mmol) in THF (10 mL) under nitrogen. The resulting mixture was stirred at room temperature for 1 hour. The reaction mixture was quenched with saturated NH4Cl (10 mL), extracted with Et2O (3×15 mL), the combined organic layers were back washed with water (10 mL), dried (MgSO4), and evaporated to afford crude product. The crude product was purified by preparative chiral-HPLC on a Merck 50 mm 20 μm Chiralpak column, eluting isocratically with 30% EtOH in isohexane (modified with Et3N) as eluent to afford the product (95 mg, 29.6%). 1H NMR (400 MHz, CDCl3) δ1.17 (d, 3H), 2.71-2.78 (m, 1H), 3.56-3.72 (m, 2H), 3.78-3.87 (m, 1H), 4.09-4.16 (m, 1H), 4.26-4.32 (m, 1H), 6.01-6.05 (m, 1H), 7.46-7.50 (m, 1H), 7.94-7.98 (m, 1H), 7.99-8.04 (m, 1H), 8.32-8.36 (m, 1H), 8.45 (s, 1H), 8.54-8.56 (m, 1H), 8.60-8.63 (m, 1H), 8.64 (s, 1H), 9.51 (s, 1H); m/z (ESI+) (M+H)+=495.42; HPLC tR=1.75 min

Provenance & Evidence