Methyl iodide → HCID 69215945, compound

Participants

Reaction Steps

To a stirred solution of 4,4-diethyl-2-oxo-1,4-dihydro-2H-3,1-benzoxazin-6-ylboronic acid (4.85 g, 19.50 mmol) in THF (100 mL) at 0° C. was added sodium hydride (3.12 g-60%, 78 mmol). After 10 minutes, methyl iodide (9.7 to mL, 156.0 mmol) was added and the reaction was allowed to warm to room temperature. After one week, the reaction was quenched with ammonium chloride solution (sat.) and extracted with ethyl acetate several times. The organic layers were washed with brine, dried over magnesium sulfate and concentrated. Trituration with ether gave 4,4-diethyl-1-methyl-2-oxo-1,4-dihydro-2H-3,1-benzoxazin-6-ylboronic acid as a yellow solid (3.97 g, 77%). 1H NMR (DMSO-d6): δ 8.03 (s, 2H), 7.78 (dd, J=8.2, 1.3 Hz, 1H), 7.60 (d, J=1.3 Hz, 1H), 7.05 (d, J=8.3 Hz, 1H), 3.28 (s, 3H), 1.99 (m, 4H), 0.78 (t, J=7.4 Hz, 6H). MS (ESI) m/z 264 ([M+H]+); MS (ESI) m/z 262 ([M−H]−); Anal. calcd for C13H18BNO4: C, 59.35; H, 6.90; N, 5.32. Found: C, 58.97; H, 6.98; N, 4.73.

Provenance & Evidence