Chloroform → 2,4-Dichloro-5H-pyrrolo[3,2-d]pyrimidine

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To a suspension of 5-benzyl-2,4-dichloro-5H-pyrrolo[3,2-d]pyrimidine (177 mg, 0.64 mmol) in 1,2-dichlorobenzene (20 mL) was added AlCl3 (852 mg, 6.4 mmol). The reaction mixture was heated at 160° C. for 1.5 h, during which the reaction mixture became dark and homogeneous. Upon completion of the reaction, the reaction mixture was cooled, added CHCl3 and washed with NH4Cl. The combined organic layers were washed with brine, dried over Na2SO4, filtered, and concentrated in vacuo. Added Hexanes and filtered off the product as purple solids (100 mg, 80%) and used for the next step without further purification.

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