Imidazole → (S)-6-Fluoro-4-(3-iodo-2-methylpropyl)-4H-benzo[1,4]oxazin-3-one

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Reaction Steps

The compound (S)-6-Fluoro-4-(3-hydroxy-2-methyl-propyl)-4H-benzo[1,4]oxazin-3-one (111MF03) (2.63 g, 11.0 mmol), triphenylphosphine (6.35 g, 24.2 mmol), imidazole (1.8 g, 26.4 mmol) and I2 (7.81 g, 30.8 mmol) were mixed according to GP9. CC (SiO2; Heptane/EtOAc 9:1-4) gave the title compound (111MF04) (3.86 g, 100%). 1H NMR (CDCl3) δ 6.97-6.93 (m, 1H), 6.82-6.78 (m, 1H), 6.73-6.68 (m, 1H), 4.63-4.53(m, 2H), 3.90 (d, J=6.8 Hz, 2H), 3.20-3.16 (m, 2H), 2.15-2.04 (m, 1H), 1.06 (d, J=6.4 Hz, 3H); 13C NMR (CDCl3) δ 165.0, 158.5 (d, J=240.2 Hz), 141.7 (d, J=2.3 Hz), 129.6 (d, J=10.4 Hz), 118.1 (d, J=9.2 Hz), 110.1 (d, J=23.4 Hz), 103.1 (d, J=28.7 Hz), 67.8, 46.3, 33.5, 18.9, 11.6.

Provenance & Evidence