Dichloromethane → 4-Chloro-2,5,6,7-tetramethyl-5H-pyrrolo[3,2-d]pyrimidine

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Reaction Conditions

Reaction Steps

A mixture of 2,5,6,7-tetramethyl-3H,4H,5H-pyrrolo[3,2-d]pyrimidin-4-one N9b (0.334 g, 1.75 mmol) and POCl3 (4 ml) is stirred at 100° C. for 17 hours. At 0° C. DCM (30 ml) and aqueous sodium hydroxide (1 mol/1, 20 ml) is added under vigorous stirring. The water phase is made basic with an aqueous solution of sodium hydroxide (1 mol/l) and extracted with DCM. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is used without further purification. Yield: 330 mg (90%). HPLC-MS: M+H=210; tR=0.92 min (METHOD—1).

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