Sodium hydride → HCID 66956067, compound

Participants

Reaction Steps

Alkylation of oxazine alcohol 180 with 5-bromo-2-fluoropyridine (91) (2.0 equiv.) and NaH (1.74 equiv.) as in Example 2OO for 3 h, followed by chromatography of the product on silica gel, eluting with 0-0.25% MeOH/CH2Cl2 (foreruns) and then with 0.25-0.5% MeOH/CH2Cl2, gave 6-{[(5-bromo-2-pyridinyl)oxy]methyl}-2-nitro-6,7-dihydro-5H-imidazo[2,1-b][1,3]oxazine (181) (67%) as a white solid: mp (MeOH/CH2Cl2/hexane) 233-235° C.; 1H NMR [(CD3)2SO] δ 8.27 (dd, J=2.5, 0.4 Hz, 1H), 8.07 (s, 1H), 7.93 (dd, J=8.8, 2.6 Hz, 1H), 6.85 (dd, J=8.9, 0.5 Hz, 1H), 4.60 (dd, J=11.0, 2.7 Hz, 1H), 4.44 (dd, J=11.1, 7.4 Hz, 1H), 4.36 (dd, J=11.0, 6.7 Hz, 1H), 4.33 (dd, J=11.0, 6.7 Hz, 1H), 4.27 (dd, J=12.5, 5.4 Hz, 1H), 4.04 (dd. J=12.6, 7.1 Hz, 1H), 2.85 (m, 1H). Anal. (C12H11BrN4O4.) C, H, N.

Provenance & Evidence