Water → 2,3-Dichloro-N-methylmaleimide

Temperature

250 °C

Sodium ethoxide (3.56 g, 50 mmol) was added to a solution containing 2,3-dichloromaleic anhydride (5.56 g, 33.3 mmol) and methylamine hydrochloride (3.50 g, 55.0 mmol) in 40 mL of acetic acid. The mixture was stirred under a CaCl2 drying tube at 250° C. for 16 hours and then refluxed for 4 hours. The cooled mixture was poured into water (350 mL) and extracted with EtOAc (3×75 mL). The combined organic extracts were washed with 100 mL portions of saturated aqueous NaHCO3, water and brine and dried (MgSO4). The solvent was evaporated under reduced pressure. The residue was recrystallized from ethanol to give 3.82 g (64%) of 2,3-dichloro N-methylmaleimide as white crystals. Concentration of the mother liquor and chromatography of the residue by radial preparative layer chromatography (Chromatotron, Harrison Research), gave an additional 0.81 g of 2,3-dichloro N-methylmaleimide, raising the yield to 77%.

1. temperaturerefluxed for 4 hours
2. extractionextracted with EtOAc (3×75 mL)
3. washThe combined organic extracts were washed with 100 mL portions of saturated aqueous NaHCO3, water and brine
4. dry with materialdried (MgSO4)
5. customThe solvent was evaporated under reduced pressure
6. customThe residue was recrystallized from ethanol

ORD record

ord-186c9152ff314deca6b5718d33f448eb

Source dataset

uspto-grants-1998_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05780461