Lawesson's reagent → HCID 86755857, compound

Participants

Reaction Steps

To a suspension of Lawesson's Reagent [(2,4-bis(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane-2,4-disulfide) (0.32 g. 0.80 mmol) in dry toluene (15 mL) at room temperature was added 7-chloro-3-(ethoxycarbonyl)pyrazolo-[3,4-c][1]benzazepine-4,10(1H,9H)-dione (0.51 g, 1.59 mmol) in one portion. The resulting slurry was heated to reflux for 1.5 hours. The reaction mixture was filtered to remove insoluble material. The filtrate was concentrated via rotary evaporator to give a green oil which was purified by flash chromatography using chloroform:methanol (9:1) as the eluent. The yellow-green solid recovered was recrystallized from methanol to give the title compound (0.44 g, 82%, mp 248.0-252.6° C.).

Provenance & Evidence