2,3-Dichloro-5,6-dicyano-1,4-benzoquinone → 3-ethyl-4-(6-tosyl-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazin-1-yl)cyclopentanol

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Reaction Steps

To 2-ethyl-4-(4-methoxybenzyloxy)cyclopentyl)-6-tosyl-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazine (1.153 g, 2.11 mmol, prepared using Z from Preparation #EE.1, A from Example #1, Step D, HATU, and TEA, B with DIEA) in DCM (18 mL) and water (3.5 mL) was added 2,3-dichloro-5,6-dicyano-p-benzoquinone (0.576 g, 2.54 mmol). The reaction mixture was stirred at ambient temperature for about 16 h. The solid was removed by filtration while washing with DCM (150 mL). The organic layer was separated and washed with saturated aqueous NaHCO3 (2×40 mL) and brine (40 mL), dried over anhydrous MgSO4, filtered, and concd under reduced pressure. The residue was purified using silica gel chromatography (40 g) eluting with a gradient of 30-100% EtOAc in DCM to give 3-ethyl-4-(6-tosyl-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazin-1-yl)cyclopentanol (0.672 g, 75%): LC/MS (Table 1, Method b) Rt=2.09 min; MS m/z: 426 (M+H)+.

Provenance & Evidence