Acetic Anhydride → HCID 9996171, compound

Participants

Reaction Steps

A mixture of 3-(3-cyclopropyl-1,2,4-oxadiazol-5-yl)-4,5-dihydroimidazo[1,5-a]quinoxaline (XXXIII, EXAMPLE 101, 0.201 g) and acetic anhydride (3 ml) in THF (0.7 ml) is heated at 80° for 45 min. The reaction mixture is then cooled, concentrated, and partitioned between dichloromethane and aqueous sodium bicarbonate. The organic phase is separated and filtered through sodium sulfate and concentrated. The crude product is crystallized from dichloromethane and hexane to give the title compound, which is then recrystallized from ethyl ether/ethyl acetate/hexane, mp 202.0°-202.5°; MS (m/z) at 321; IR (mineral oil) 1674, 1639, 1501, 1358 and 1401 cm-1 ; NMR (CDCl3) 1.15, 2.18, 2.29, 5.32, 7.41, 7.62 and 8.15 δ.

Provenance & Evidence