Phosphorus oxychloride → 4-chloro-N-(1-methyl-1H-pyrazol-4-yl)-7H-pyrrolo[2,3-d]pyrimidin-2-amine

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Reaction Steps

A solution of 2-((1-methyl-1H-pyrazol-4-yl)amino)-7H-pyrrolo[2,3-d]pyrimidin-4-ol (5 g, 0.02 mol) in POCl3 (50 mL) was stirred at 120° C. for 4 hrs. After removal of POCl3 by rotary evaporation, water (37 mL) was added. The pH was adjusted to 10 by aq. NaOH (2 mol/L, 30 mL) and then extracted with EtOAc/THF (2:1, three×200 mL). The combined organic layers were concentrated to dryness to afford the title compound (2.8 g, 56% yield) as a brown solid, which was used as is in the next step.

Provenance & Evidence