Sodium hydride → 7-Amino-1-[(1,3-dibenzoyloxy-2-propoxy)methyl]-1,3-azaphospholo[4,5-d]pyrimidine

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Reaction Steps

To a suspension of 7-amino-1H-1,3-azaphospholo[4,5-d]pyrimidine (compound 10, 0.5 g, 3.29 mmol) in DMF (20 mL) was added NaH (0.16 g, 4 mmol) under an argon atmosphere. After stirring the mixture at room temperature for 40 min, (1,3-dibenzoyloxy-2-propoxy)methyl bromide (109) (1.38 g, 3.5 mmol) was added and the reaction was continued for 18 h. The solvent was evaporated in vacuo. The residue was dissolved in dichloromethane (150 mL) and the organic solution was washed with water (30 mL). Aqueous layer was extracted with dichloromethane (2×100 mL) and the combined organic extracts were dried (Na2SO4) and evaporated. The residue was purified by silica gel column (2×15 cm) chromatography. The column was flash eluted with dichloromethane containing 0-2.5% methanol. The appropriate fractions containing the desired product were evaporated to yield 0.68 g (44%) of the title compound, mp 148-150° C. 1H nmr (DMSO-d6): δ 4.35 (m, 3 H, CH, CH2), 4.52 (m, 2 H, CH2), 5.79 (s, 2 H, CH2), 7.45-7.75 (m, 10 H, 2 Bz), 8.33 (s, 2 H, NH2), 8.66 (d, 1 H, C5H), and 8.81 (d, 1 H, J =57.9 Hz, C2H ). Anal. Calcd. for C23H21N4O5P: C, 59.48; H, 4.56; N, 12.07. Found: C, 59.08; H, 4.56; N, 12.02.

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