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To a THF solution (3 mL) of the amine from above (100 mg, 0.300 mmol) was added N-(Phenoxycarbonyl)hydroxylamine (54.8 mg, 0.360 mmol), and the resultant solution was heated to 80° C. for 7 h and stirred at room temperature for 66 h. The solution was concentrated to dryness and the crude material was purified by flash chromatography on silica gel (CH2Cl2/MeOH/NH4OH, 80:10:10) to afford COMPOUND 288 (49 mg, 55%) as a white solid. 1H NMR (CDCl3) δ 1.36-1.55 (m, 2H), 1.75 (d, 2H, J=11.7 Hz), 2.34 (s, 3H), 2.50-2.74 (m, 3H), 3.92 (s, 2H), 3.95 (d, 2H, J=15 Hz), 4.02 (s, 2H), 6.83 (br s, 1H), 7.04 (d, 1H, J=7.2 Hz), 7.11-7.23 (m, 2H), 7.52 (d, 1H, J=7.2 Hz), 7.74 (d, 1H, J=7.8 Hz), 8.18 (s, 1H), 8.53 (d, 1H, J=4.5 Hz); 13C NMR (CDCl3) δ 18.78, 27.46, 43.88, 52.09, 53.87, 54.58, 56.25, 118.67, 121.91, 122.15, 122.64, 124.55, 132.19, 133.51, 139.04, 141.08, 143.03, 145.87, 157.78, 161.25; ES-MS m/z 395 (M+H). Anal. Calcd. for C21H26N6O.0.5H2O.0.2 CH2Cl2: C, 58.76; H, 6.41; N, 19.21. Found: C, 58.65; H, 6.36; N, 19.19.

1. concentrationThe solution was concentrated to dryness
2. customthe crude material was purified by flash chromatography on silica gel (CH2Cl2/MeOH/NH4OH, 80:10:10)