Potassium Cyanide → 3-ethyl-4-(6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazin-1-yl)cyclopentyl benzoate

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Reaction Steps

To a mixture of 3-ethyl-4-(6-tosyl-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazin-1-yl)cyclopentyl benzoate (5.00 g, 7.84 mmol, prepared from Example #4 Step J using II with benzoic acid, and B) in MeOH (16 mL) was added a solution of potassium cyanide (0.74 mL, 17.2 mmol) in MeOH (16 mL). The reaction was stirred at ambient temperature for about 16 h. The reaction mixture was concd under reduced pressure to afford a residue. The residue was partitioned between water (20 mL) and DCM (20 mL). The layers were separated and the aqueous layer was extracted with DCM (3×10 mL). The extract was then washed with saturated aqueous NaHCO3, dried over anhydrous MgSO4, filtered, and concd under reduced pressure to afford a crude oil. The crude material was purified by silica gel chromatography eluting with a gradient of 0-10% MeOH in DCM to 3-ethyl-4-(6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazin-1-yl)cyclopentyl benzoate (2.30 g, 78%) as a red tinted solid. LC/MS (Table 1, Method a) Rt=2.08 min; MS m/z: 376 (M+H)+.

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