Tetrabutylammonium Fluoride → HCID 57504419, compound

Participants

Reaction Steps

Tetrabutylammonium fluoride (1M in THF) (604 μl, 0.60 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-fluoropyridin-2-yl)propanamide (Intermediate AN5) (303 mg, 0.50 mmol) in THF (5 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 AS column, eluting isocratically with 30% EtOH in isohexane (modified with Et3N) as eluent to afford the product (112 mg, 45.6%). 1H NMR (400 MHz, CDCl3) δ1.17 (d, 3H), 2.99-3.05 (m, 1H), 3.54-3.61 (m, 1H), 3.62-3.70 (m, 1H), 3.75-3.84 (m, 1H), 4.07-4.13 (m, 1H), 4.25-4.31 (m, 1H), 6.04-6.09 (m, 1H), 7.43-7.50 (m, 2H), 7.99-8.03 (m, 1H), 8.13 (d, 1H), 8.18-8.23 (m, 1H), 8.45 (s, 1H), 8.61-8.63 (m, 1H), 8.64 (s, 1H), 9.17 (s, 1H); m/z (ESI+) (M+H)+=488.42; HPLC tR=1.74 min

Provenance & Evidence