Acetic Acid → Methyl 3-bromo-2-fluoro-6-methyl-5-[(oxan-4-yl)amino]benzoate

Participants

Reaction Steps

To a solution of methyl 3-amino-5-bromo-6-fluoro-2-methylbenzoate (2.23 g, 8.08 mmol) in 1,2-Dichloroethane (32 ml) at room temperature and under nitrogen was added oxan-4-one (1.49 ml, 16.17 mmol) followed by acetic acid (2.78 ml, 48.5 mmol). This solution was stirred for 5 minutes before the addition of sodium triacetoxyborohydride (5.14 g, 24.25 mmol) at room temperature. After stirring for 5.5 hours there was no unreacted starting material present by LCMS. Deionized water (32 ml) was added and the mixture was neutralized with solid NaHCO3. The phases were separated and the aqueous layer was extracted with EtOAc (2×32 ml). The combined organic extracts were dried over MgSO4, filtered and concentrated under reduced pressure. The residue was purified by FCC (50 g silica, Isolute cartridge, gradient of eluents; 95:5 Heptane:EtOAc to 6:4 Heptane:EtOAc) to give 2.3 g (82%) of methyl 3-bromo-2-fluoro-6-methyl-5-[(oxan-4-yl)amino]benzoate as a off-white solid. LC-MS 99%, 2.13 min (3 minute LC-MS method), m/z=245.9/247.9, 1H NMR (500 MHz, Chloroform-d) δ ppm 6.78 (d, J=5.9 Hz, 1H), 4.01 (dt, J=11.9, 3.4 Hz, 2H), 3.93 (s, 3H), 3.53 (td, J=11.7, 2.1 Hz, 2H), 3.49-3.42 (m, 1H), 3.34 (s, 1H), 2.04 (s, 5H), 1.48 (qd, J=11.0, 4.2 Hz, 2H).

Provenance & Evidence