Methane → Benzeneethanimidamide

温度

0 °C

Ammonium chloride (2.9 g, 54 mmol) was suspended in 20 mL of anhydrous toluene, stirred under argon, and cooled to 0° C. To this suspension was added 25 ml (50 mmol) of a 2M solution of trimethylaluminum in toluene. The reaction was allowed to warm to room temperature and stirring continued until the evolution of methane ceased (˜1 hour). Then, 3.46 mL (30 mmol) of benzyl cyanide in 10 mL of anhydrous toluene was added and the reaction was heated to 80° C. for 18 hours. The reaction was then cooled to room temperature and slowly poured into a slurry of 15 g of silica gel in 50 mL of chloroform and stirred for 5 minutes. The silica was filtered and washed with methanol. The filtrate and washings were combined and reduced to a volume of ˜15 mL and refiltered. Then, 18 mL (54 mmol) of a 3N solution of methanolic HCl was added to the filtrate followed by 400 mL of diethyl ether. After 16 hours of stirring at room temperature, a white precipitate formed and was subsequently filtered. This crude solid was then added to 150 mL of a 4:1 mixture of isopropanol-acetone and stirred for an additional 16 hours at room temperature. Undissolved ammonium chloride was then removed by filtration and the filtrate reduced to ˜15 mL, and 300 mL of diethyl ether was added and the mixture stirred for ˜1 hour. The white precipitate was then filtered and dried to yield 3.7 g (72%) of the objective compound as the hydrochloride salt. MS: (ESI, Pos) m/z 157.9 (M+23) 1H NMR (500 MHz, DMSO-d6): δ (ppm) 9.06 (br.d, 3H), 7.49 (d, 2H), 7.36 (t, 2H), 7.31 (t, 1H), 3.74 (s, 2H).

1. temperatureto warm to room temperature
2. stirringstirring
3. custom(˜1 hour)
4. temperaturethe reaction was heated to 80° C. for 18 hours
5. temperatureThe reaction was then cooled to room temperature
6. stirringstirred for 5 minutes
7. filtrationThe silica was filtered
8. washwashed with methanol
9. additionThen, 18 mL (54 mmol) of a 3N solution of methanolic HCl was added to the filtrate
10. stirringAfter 16 hours of stirring at room temperature
11. customa white precipitate formed
12. filtrationwas subsequently filtered
13. additionThis crude solid was then added to 150 mL of a 4:1 mixture of isopropanol-acetone
14. stirringstirred for an additional 16 hours at room temperature
15. customwas then removed by filtration
16. additionwas added
17. stirringthe mixture stirred for ˜1 hour
18. filtrationThe white precipitate was then filtered
19. customdried

ORDレコード

ord-3742000fd21d4ecf8506aac54086878a

出典データセット

uspto-grants-2013_09

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08541431B2