Acetic Acid → 2,3-Dichloro-N-methylmaleimide

Temperatur

10 °C

A 3L-three-necked flask fitted with a magnetic stir bar, digital thermocouple/thermometer, nitrogen purge and solid addition funnel was charged with 450 g (269.5 mol) of dichloromaleic anhydride, 191 g (282.8 mol) of methylamine hydrochloride and 1.6 L of acetic acid. The reaction mixture was then cooled to 10° C., and 160 g NaOMe added from the solid addition funnel over 1 hour while keeping the temperature between 10°-12° C. The reaction mixture was allowed to stir at room temperature for 42 hours (24 hours is sufficient) then heated to 100° C. for 3 hours. HPLC analysis at this time indicated that all the starting material had disappeared. The reaction was cooled to room temperature and 2L water was added. The mixture was then cooled to 3°-10° C. for 1 hour and filtered at 4° C. The solids were then rinsed with 2L of cold deionized water. The pale yellow solid dried in an air oven overnight to afford 360 g (75%) yield of the titled compound.

1. customA 3L-three-necked flask fitted with a magnetic stir bar
2. customdigital thermocouple/thermometer, nitrogen purge
3. additionsolid addition funnel
4. custombetween 10°-12° C
5. temperaturethen heated to 100° C. for 3 hours
6. temperatureThe reaction was cooled to room temperature
7. temperatureThe mixture was then cooled to 3°-10° C. for 1 hour
8. filtrationfiltered at 4° C
9. washThe solids were then rinsed with 2L
10. customThe pale yellow solid dried in an air oven overnight

ORD-Eintrag

ord-67962ef8139e4d2cb9b9baad9d96453b

Quelldatensatz

uspto-grants-1999_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05859261