In methanol (18.7 ml) was suspended 5-methyl-2-mercapto-7H-pyrrolo[2,3-d]pyrimidin-4(3H)-one (1.36 g) followed by addition of 1N-sodium hydroxide (7.88 ml) for dissolution. Then, under ice-cooling, a solution of 4-(2,4-dichlorobenzoyl)benzyl bromide (3.09 g) in DME (8 ml) was added dropwise. The mixture was stirred at room temperature for 4 hours and the resulting crystalline precipitate was collected by filtration and rinsed with water. The crystals were further rinsed with 50% ethanol/water, methanol and ether, dried, and recrystallized from DME (1,2-dimethoxyethane) to provide the title compound (2.03 g). 1H-NMR (DMSO-d6) δ: 2.23(3H,s), 4.48(2H,s), 6.65(1H,s), 7.53(1H,d,J=8.2Hz), 7.59(1H,dd,J=1.6,8.8Hz), 7.64(2H,d,J=8.4Hz), 7.69(2H,d,J=8.4Hz), 7.80(1H,d,J=1.6Hz), 11.40(1H,s), 11.96(1H,s).
