Sodium hydride → Methyl (2S)-2-[1-[5-chloro-3-(trifluoromethyl)pyridin-2-yl]pyrazolo[4,5-e]pyrimidin-4-yl]oxy-3-ethoxypropanoate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

60% Sodium hydride in mineral oil (0.316 g, 7.90 mmol) was added portionwise to (S)-methyl 3-ethoxy-2-hydroxypropanoate (Intermediate G4) (0.976 g, 6.59 mmol) in tetrahydrofuran (50 mL) cooled to 5° C. over a period of 1 minute under nitrogen. The resulting solution was stirred at 0° C. for 10 minutes. A solution of 4-chloro-1-(5-chloro-3-(trifluoromethyl)pyridin-2-yl)-1H-pyrazolo[3,4-d]pyrimidine (Intermediate K3) (1.1 g, 3.29 mmol) was added portionwise over a period of 1 minute. The resulting mixture was allowed to warm to ambient temperature and stirred for 2 hours. The mixture was cooled to 10° C., quenched with 1M citric acid (20 mL) and extracted with ethyl acetate (2×50 mL). The combined organic extracts were washed with water (25 mL) and saturated brine (25 mL), dried (MgSO4) and evaporated. The crude product was purified by flash silica chromatography, eluting with 20 to 50% ethyl acetate in isohexane to give the product (1.1 g, 73%). 1H NMR (400 MHz, CDCl3) δ 1.25 (3H, t), 3.72 (2H, d), 3.81 (3H, s), 3.99-4.13 (2H, m), 5.84 (1H, dd), 8.22-8.24 (1H, m), 8.38 (1H, s), 8.57 (1H, s), 8.81-8.82 (1H, m); m/z (ESI+) (M+H)+=446; HPLC tR=2.52 min.

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