Hydrochloric Acid → 3-ethyl-4-(6-tosyl-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazin-1-yl)cyclopentanone

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Reaction Steps

A round bottom flask was charged with 1-((7S,8R)-8-ethyl-1,4-dioxaspiro[4.4]nonan-7-yl)-6-tosyl-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazine (3.56 g, 7.61 mmol) and THF (20 mL). To the solution was added aqueous HCl (6N, 3.81 mL, 22.8 mmol) and the mixture was stirred at rt for about 2 h. The solvent was removed under reduced pressure and DCM (75 mL) and water (50 mL) were added. The layers were separated and the organic solution was dried over anhydrous MgSO4, filtered, and concd under reduced pressure to give 3-ethyl-4-(6-tosyl-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazin-1-yl)cyclopentanone as a brown foam (2.99 g, 93%): LC/MS (Table 1, Method c) Rt=1.40 min; MS m/z: 424 (M+H)+.

Provenance & Evidence