[O:1]1[CH:5]=[CH:4][CH:3]=[C:2]1[C:6]1[NH:14][C:13]2[C:12](=O)[NH:11][CH:10]=[N:9][C:8]=2[CH:7]=1.P(Cl)(Cl)([Cl:18])=O>O1CCOCC1>[Cl:18][C:12]1[C:13]2[NH:14][C:6]([C:2]3[O:1][CH:5]=[CH:4][CH:3]=3)=[CH:7][C:8]=2[N:9]=[CH:10][N:11]=1A mixture of 6-(2-furyl)-4,5-dihydro-3H-pyrrolo[3,2-d]pyrimidin-4-one (2.20 g) and phosphoryl chloride (10.7 g) was stirred at 100° C. for 20 min, dioxane (30 mL) was added, and the mixture was stirred at 100° C. for 3 hrs. After concentration under reduced pressure, saturated aqueous sodium hydrogen carbonate was added to the residue, and the mixture was extracted with ethyl acetate-acetone (155 mL×4). The organic layers were combined, washed with saturated brine (100 mL), dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue washed with ethyl acetate-diethyl ether, and dried under reduced pressure at 60° C. to give the title compound (2.19 g).
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