反应详情

A mixture of 1.5 g (21.6 mmole) of hydroxylamine hydrochloride, 2 g (24.4 mmole) of sodium acetate, 3.4 g (14.1 mmole) of the product of Example 25, 20 ml of water and 40 ml of ethanol was warmed on a water bath for one hour and the mixture was evaporated to a volume of 20 ml. The mixture was filtered and the recovered product was rinsed with water and dried over P2O5 under vacuum to obtain 2.9 g of 4,5-dihydro-5-ethyl-4-oxopyrrolo-[1,2-a]-quinoxaline-2-carboxaldehyde oxime in the form of colorless needles melting at 262°-264° C.

1. temperaturewas warmed on a water bath for one hour
2. customthe mixture was evaporated to a volume of 20 ml
3. filtrationThe mixture was filtered
4. washthe recovered product was rinsed with water
5. dry with materialdried over P2O5 under vacuum