Phosphorus oxychloride → 4-Chloro-6-(4-nitrophenyl)-7H-pyrrolo[2,3-d]pyrimidine

Participants

Reaction Steps

4-Chloro-6-(4-nitro-phenyl)-7H-pyrrolo[2,3-d]pyrimidine is prepared, with the exclusion of moisture, by heating 4-hydroxy-6-(4-nitro-phenyl)-7H-pyrrolo[2,3-d]pyrimidine to boiling point with an excess of POCl3. The suspension is concentrated to a residual volume of 20 ml by evaporation. The residue is introduced in portions into water, neutralized with solid NaHCO3, and 0.2 liter of ethyl acetate is added. Filtration and washing with hot THF yield the title compound, m.p. >280° C.; FAB-MS: (M+H)+ =275.

Provenance & Evidence