Dimethyl Sulfate → 5-chloro-N-methyl-2-nitroaniline

Temperatur

0 °C

To a solution at 0° C. of 5-chloro-2-nitroaniline (100 g) in dimethylformamide (1.0 l) was added potassium t-butoxide (70.3 g) and the mixture was stirred at 0° C. for 1 hour. To the reaction mixture was added dropwise a solution of dimethyl sulfate (62 ml) in dimethylformamide (100 ml) and the resulting mixture was stirred at 25° C. for 1.5 hours to afford a solution of 5-chloro-N-methyl-2-nitroaniline in dimethylformamide. To the resulting mixture was added 24% sodium methoxide in methanol (230 ml) and the mixture was heated at 55° C. for 2 hours with stirring. At the end of this time the reaction mixture was cooled to 25° C. and water (1.5 l) was added. The precipitated crystals were collected by filtration and washed with water and methanol to give the desired compound (94.5 g, yield 90%).

1. stirringthe resulting mixture was stirred at 25° C. for 1.5 hours

ORD-Eintrag

ord-b26ba9874b1d4c2bbf8d5ea017907e64

Quelldatensatz

uspto-grants-2004_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06753347B2