Hydrochloric Acid → 3-fluoro-N-methylaniline

1-((3-Fluoroanilino)methyl)-1H-benzotriazole (173.9 g) was slurried in dry tetrahydrofuran. Sodium borohydride (32.5 g) was added portionwise to the mixture at room temperature. After addition was complete, the mixture was heated at reflux for 4 hours. The solution was cooled and poured slowly into 400 mL of 5M hydrochloric acid with ice and stirred for 1 hour at room temperature. The solution pH was adjusted to 9-10 using 10M sodium hydroxide solution. The product was extracted using diethyl ether. The ether extracts were washed successively with 1M sodium hydroxide solution, saturated sodium chloride solution, and water. The organic phase was dried over sodium sulfate and evaporated under reduced pressure to yield 87.5 g (97%) of 3-fluoro-N-methylaniline as a colorless oil. [NMR (200 MHz, DMSO-d6): δ 2.76 (s, 3H); 3.41 (br s, 1H); 6.59-6.92 (m, 3H); 7.27 (q, J=8.0Hz, 1H)].

1. additionAfter addition
2. temperaturethe mixture was heated
3. temperatureat reflux for 4 hours
4. temperatureThe solution was cooled
5. extractionThe product was extracted
6. washThe ether extracts were washed successively with 1M sodium hydroxide solution, saturated sodium chloride solution, and water
7. dry with materialThe organic phase was dried over sodium sulfate
8. customevaporated under reduced pressure

ORD record

ord-141eb8d9308e4789a21ed8d0d39071c2

Source dataset

uspto-grants-1997_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05681830