Trifluoroacetic acid → HCID 56611798, compound

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Reaction Steps

Trifluoroacetic acid (50.0 ml) is added to a solution of 5-tert-butyl-3-(4-fluorophenyl)-4,5-dihydroimidazo[1,5-a]quinoxalin-4-one (XXXIV, EXAMPLE 245, 4.01 g) and methylene chloride (50.0 ml) at 0°. The solution is stirred for 1 hr at 0° and is concentrated. The residue is triturated with water, filtered, washed with water (2×100 ml), ether (2×100 ml), and dried under reduced pressure to give the title compound, mp >300°; IR (mineral oil) 2955, 2922, 2868, 2855, 1667, 1499, 1377 and 1366 cm-1 ; NMR (d6 -DMSO) 11.45, 9.16, 8.3-8.45, 8.21 and 7.2-7.45 δ; MS (EI, m/z) 279, 251 and 223.

Provenance & Evidence