反应详情

Methanesulfonyl chloride (0.92 g, 0.6 mL, 8.0 mmol) was added dropwise to a stirred boiling mixture of 2-butyl-5-benzofuranylamine hydrochloride [12a] (0.90 g, 4.0 mmol), tetramethylammonium chloride (0.11 g, 1.0 mmol) and toluene (10 mL) for 1 hour. The mixture was stirred under reflux conditions for 1 hour. Ethyl acetate (20 mL) and water (30 mL) were added to the cold mixture. The organic layer was separated and aqueous layer was extracted with ethyl acetate (2×20 mL). The combined organic layers were dried over sodium sulfate and evaporated under reduced pressure to give 1.01 g (94.0%) of N-(2-butyl-5-benzofuranyl)methanesulfonamide [14] with mp 104.9-105.9° C.

1. customThe organic layer was separated
2. extractionaqueous layer was extracted with ethyl acetate (2×20 mL)
3. dry with materialThe combined organic layers were dried over sodium sulfate
4. customevaporated under reduced pressure