Pyridine → Methyl 3-amino-2-bromo-4-methylbenzoate

A mixture of 16.5 g (100 mmol) of methyl-3-amino-4-methylbenzoate and 300 ml of CCl4 was treated with 18.6 g (105 mmol) of N-bromosuccinimide and stirred at ambient temperature for four hours. The reaction mixture was filtered, and the filtrate was evaporated at reduced pressure to afford an amber oil. To remove material resulting from bromination at the 6-position, the crude product was taken up in 100 ml of hexane and 60 ml of ether and treated with 3.96 g (50.0 mmol) of pyridine and 3.06 g (30.0 mmol) of acetic anhydride. After stirring for three hours at 25° C., the precipitate was removed by filtration. The filtrate was evaporated at reduced pressure to yield an amber oil. The crude product was purified by HPLC to afford 14.5 g (59%) of the desired product as an amber oil. IR and 1H NMR spectra were in agreement with the assigned structure.

1. filtrationThe reaction mixture was filtered
2. customthe filtrate was evaporated at reduced pressure
3. customto afford an amber oil
4. customTo remove material
5. customresulting from bromination at the 6-position
6. stirringAfter stirring for three hours at 25° C.
7. customthe precipitate was removed by filtration
8. customThe filtrate was evaporated at reduced pressure
9. customto yield an amber oil
10. customThe crude product was purified by HPLC

ORD-Eintrag

ord-514140fd58f845b4ae661a28ee8839b8

Quelldatensatz

uspto-grants-1989_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US04818273