Water → 7-[2-(t-butyldimethylsilanyloxy)ethyl]-4-chloro-7H-pyrrolo[2,3-d]pyrimidin-2-amine

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Reaction Steps

To a suspension of NaH (0.618 g, 15.45 mmol) in anhydrous DMF (15 mL) at 0° C. is added slowly a solution of 4-chloro-7H-pyrrolo[2,3-d]pyrimidin-2-amine (2 g, 11.86 mmol) in 5 mL of anhydrous DMF. The mixture is stirred at this temperature under N2 for 15 min, then (2-bromoethoxy)-t-butyldimethylsilane (4.0 mL, 18.64 mmol) is added at 0° C. The mixture is stirred at RT overnight. The reaction mixture is poured into water and extracted with ethyl acetate (EtOAc; 4×). The organic layer is dried over anhydrous magnesium sulfate (MgSO4), filtered and concentrated in vacuo. The crude product is purified by flash cromatography using EtOAc/cyclohexane (1/1) as eluent to yield 7-[2-(t-butyldimethylsilanyloxy)ethyl]-4-chloro-7H-pyrrolo [2,3-d]pyrimidin-2-amine as white needles: LC/MS (M+1=327). 1H NMR (CDCl3, 400 MHz) δ-0.08 (s, 6H), 0.84 (s, 9H), 3.88 (t, 2H, J=5.2 Hz), 4.17 (t, 2H, J=5.2 Hz), 4.89 (s, 2H, NH2), 6.35 (d, 1H, J=3.6 Hz), 6.96 (d, 1H, J=16 Hz).

Provenance & Evidence