2-Chlorobenzoyl chloride → 5-[(2-Chloro)benzoyl]-3-(5-cyclopropyl-1,2,4-oxadiazol-3-yl)-4,5-dihydroimidazo[1,5-a]quinoxaline

Participants

Reaction Steps

A slurry consisting of 3-(5-cyclopropyl-1,2,4-oxadiazol-3-yl)-4,5-dihydroimidazo[1,5-a]quinoxaline (XXXlII, EXAMPLE 88, 0.492 g), 2-chlorobenzoyl chloride (0.268 ml), dimethyl-aminopyridine (0.0538 g), diisopropylethylamine (0.368 g), and THF (9 ml) is stirred at 20°-25° for 1.5 hr. The mixture is then partitioned between ethyl acetate, aqueous sodium bicarbonate, and saline. The product is poorly soluble in both the organic and aqueous phases, filtration of the extraction solvents gives additional material. The crude product is then triturated with ethyl ether and dried to give the title compound, mp 254°-256°; MS (m/z) at 417, 419; IR (mineral oil) 1659, 1576, 1508, 765 and 1394; NMR (CDCl3) 8.16 δ.

Provenance & Evidence