Ethylenediamine → 1-phenethyl-3-(5H-pyrrolo[2,3-b]pyrazin-2-yl)-urea

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A solution of 1-phenethyl-3-[5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazin-2-yl]-urea (0.22 g, 0.53 mmol), tetrabutylammonium fluoride (1 M in THF, 3 mL, 3 mmol) and ethylene diamine (0.3 mL, 5 mmol) in 5 mL of N,N-dimethylformamide was stirred at 80° C. for 14 h, then concentrated. The resulting residue was triturated with methanol then ether to afford 0.040 g (26%) of 1-phenethyl-3-(5H-pyrrolo[2,3-b]pyrazin-2-yl)-urea as an off-white solid.

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