Chlorosuccinimide → 4-Chloro-1, 7-dimethyl-6-(phenylsulfonyl)-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyridine

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Reaction Conditions

Reaction Steps

A suspension of 1,7-dimethyl-6-(phenylsulfonyl)-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyridine (2.0 g, 6.1 mmol, from Step 4) and N-chlorosuccinimide (0.91 g, 6.8 mmol, Aldrich) in 1,2-dichloroethane (40 mL) was heated at 60° C. overnight. Flash chromatography, eluting with a gradient from 0-5% MeOH/DCM (0.5% NH4OH), afforded an orange solid which was refluxed in 10 mL MeOH for 15 minutes. The product was isolated by filtration. Yield: (2.2 g, 80%). 1H NMR (500 MHz, d6-DMSO) δ 8.23 (s, 1H), 8.01-7.96 (m, 2H), 7.80-7.74 (m, 1H), 7.68-7.61 (m, 2H), 7.22 (s, 1H), 2.86 (s, 3H), 2.62 (s, 3H); LCMS (M+H)+: 361.

Provenance & Evidence