Hydrogen Peroxide → HCID 135899492, compound

Participants

Reaction Conditions

Reaction Steps

H2O2 (70%, 1.7 mL, ca. 17 mmol) was added dropwise to a stirred solution of TFAA (2.4 mL, 17 mmol) in DCM (15 mL) at 0° C. The solution was stirred at 20° C. for 10 min, then cooled to 0° C., added to a solution of 1-oxide 258 (440 mg, 1.7 mmol) and TFA (0.66 mL, 8.5 mmol) in DCM (15 mL) at 0° C. The solution was stirred at 20° C. for 4 h, diluted with dilute aqueous NH3 solution (80 mL) and extracted with DCM (4×125 mL). The combined organic fraction was dried and the solvent evaporated. The residue was purified by chromatography, eluting with a gradient (1-10%) of MeOH/DCM, to give 1,4-dioxide 259 (35 mg, 8%) as a red solid: mp 120-124° C.; 1H NMR δ 8.10 (s, 1H, H-10), 7.96 (s, 1H, H-5), 6.95 (br s, 1H, NH), 3.78 (s, 2H, H-6), 3.63 (dq, J=7.2, 6.0 Hz, 2H, CH2N), 3.10 (t, J=6.0 Hz, 2H, H-8), 2.75 (t, J=6.0 Hz, 2H, H-9), 2.50 (s, 3H, NCH3), 1.36 (t, J=7.2 Hz, 3H, CH3); 13C NMR δ 149.3, 145.5, 136.5, 135.3, 129.3, 120.5, 113.9, 58.1, 52.1, 45.8, 36.5, 29.1, 14.8; MS (APCI) m/z 276. (MH+, 100%); HRMS (FAB+) calcd for C13H18N5O2 (MH+) m/z 276.1461, found 276.1456.

Provenance & Evidence