Pyridine → 2-(6,11-Dihydro-11-oxodibenz[b,e]oxepin-2-yl)acetaldoxime

Participants

Reaction Conditions

Reaction Steps

A solution of 2-(6,11-dihydro-11-oxodibenz[b,e]oxepin-2-yl)acetyl chloride (15.00 g) in 150 ml of dry diglyme was stirred at -78° C. under nitrogen as lithium tri-tert-butoxyaluminohydride (104.6 ml of a 0.5M solution in diglyme) was added slowly dropwise over one hour. The reaction was stirred ten minutes at -78° C. and then quenched with 3 ml of glacial acetic acid added slowly dropwise. After warming the reaction to room temperature 50 ml of pyridine and 2 equiv. of hydroxylamine hydrochloride (7.27 g) was added and the slurry stirred at 50° C. for two hours. The solvent was evaporated using high vacuum and the residue taken up in chloroform and 1N HCl. The layers were separated and the aqueous phase extracted with chloroform. The combined organic phases were dried (MgSO4), filtered, and evaporated. The residue was purified by flash chromatography (silica; 5:2 hex-EtOAc) and recrystallized from ethyl acetate-hexane to give 2-(6,11-dihydro-11-oxodibenz[b,e]oxepin-2-yl)acetaldoxime, as crystals, m.p. 132°-134° C.

Provenance & Evidence