Methylamine → N-Methyl-3-nitrobenzenesulfonamide

A reaction vessel charged with 3-nitro-benzenesulfonyl chloride (the compound of formula (U), 4.42 g, 20.0 mmol) in 150 mL of dry THF at 0° C. was further charged with methylamine (25.0 mL of a 2M solution in THF, 50 mmol, represented by the formula HNRR′ wherein R═H and R′=methyl). The resulting cloudy solution was stirred overnight at ambient temperature. The reaction mixture was then diluted with 150 mL of saturated sodium chloride solution and 50 mL of ethyl acetate. The layers were separated and the aqueous phase was extracted twice with 50 mL of ethyl acetate. The combined organic layers were dried over sodium sulfate, filtered, concentrated under reduced pressure. The resulting crude material was purified by recrystallization from ethanol to yield 4.20 g (19.5 mmol) of N-methyl-3-nitrobenzenesulfonamide, the compound of formula (V) wherein R is methyl.

1. customThe layers were separated
2. extractionthe aqueous phase was extracted twice with 50 mL of ethyl acetate
3. dry with materialThe combined organic layers were dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe resulting crude material was purified by recrystallization from ethanol

ORD record

ord-c87c7c938a2542f1af6016a3ece55341

Source dataset

uspto-grants-2011_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07875728B2