Methyl iodide → N-Methyl-3-nitrophenyl cyanamide

Temperature

-20 °C

To a cooled (-20° C.) and stirred solution of 3-nitrophenyl cyanamide (1 g) in a mixture of anhydrous tetrahydrofuran and anhydrous dimethylformamide (3:1; 20 ml) was added sodium hydride (60% dispersion in oil; 294 mg) in one portion, under a nitrogen atmosphere. After 8 minutes of stirring at -20° C., methyl iodide (1.14 ml) was added and the red mixture was allowed to warm to room temperature and diluted with anhydrous dimethylformamide (5 ml). After a further 45 minutes of stirring, water (75 ml; CAUTION| hydrogen evolution) was added and products were extracted with ethyl acetate (2×100 ml). The combined organic phases were washed with brine (1×50 ml), dried (MgSO4) and concentrated. The remaining solid was dissolved in ethyl acetate (30 ml) and hexane (100 ml) was added to give the title compound (880 mg) as fine needles; δH (250 MHz, DMSO-d6) 7.98 (1H, m, Ar--H), 7.85 (1H,t, J=2.2 Hz, Ar--H), 7.73 (1H, t, J=7.7 Hz, Ar--H), 7.60 (1H, m, Ar--H), 3.45 (3H, s, --NMe);m/z (CI) 177 (M-).

1. temperatureto warm to room temperature
2. stirringAfter a further 45 minutes of stirring
3. extractionproducts were extracted with ethyl acetate (2×100 ml)
4. washThe combined organic phases were washed with brine (1×50 ml)
5. dry with materialdried (MgSO4)
6. concentrationconcentrated
7. dissolutionThe remaining solid was dissolved in ethyl acetate (30 ml)
8. additionhexane (100 ml) was added

ORD record

ord-92e69a5d0c354d8b9f51608c7ccfa92b

Source dataset

uspto-grants-1997_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05681833