Sodium Cyanide → 4-bromo-2-methoxy-6-methylbenzonitrile

Temperature

0 °C

(4-Bromo-2-methoxy-6-methyl-phenyl)-amine hydrobromide (5.0 g, 23.2 mmol) is suspended in concentrated hydrochloric acid (5.5 ml) and ice (20 g) followed by the drop wise addition of a solution of sodium nitrite (1.63 g, 23.6 mmol) in water (5.5 ml) at 0° C. The resulting mixture is stirred at 0° C. for 30 min and neutralized with aqueous sodium carbonate. This mixture is then added with vigorous stirring at 0° C. to a suspension prepared by mixing copper(I) cyanide (2.6 g, 28.9 mmol) in water (11 ml) with a solution of sodium cyanide (3.6 g, 73.6 mmol) in water (5.5 ml) at 0° C. To the mixture is added toluene (45 ml) and stirred at 0° C. for 1 h, at RT for 2 h and at 50° C. for 1 h. The reaction mixture is cooled and the toluene layer is separated. The organic layer is washed with water (2×40 ml), dried over sodium sulfate and evaporated to get the crude product which is purified by column chromatography (silica gel, 10% ethyl acetate/hexane) to obtain 4-bromo-2-methoxy-6-methyl-benzonitrile (2.8 g, 12.4 mmol, 53%).

1. additionThis mixture is then added
2. customprepared
3. stirringstirred at 0° C. for 1 h, at RT for 2 h and at 50° C. for 1 h
4. temperatureThe reaction mixture is cooled
5. customthe toluene layer is separated
6. washThe organic layer is washed with water (2×40 ml)
7. dry with materialdried over sodium sulfate
8. customevaporated
9. customto get the crude product which
10. customis purified by column chromatography (silica gel, 10% ethyl acetate/hexane)

ORD record

ord-49d34e4b2b9a48849e7aa52a75e1b2a4

Source dataset

uspto-grants-2015_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09108936B2