Reaktion #412609

Reaktionsgleichung

methyl 5,10-dihydro-1,4-dimethyl-10-oxo-4H-benzo-[5,6]-cyclohepta[1,2-b]pyrrol-2-acetate

sodium hydroxide

→

5,10-dihydro-1,4-dimethyl-10-oxo-4H-benzo[5,6]cyclohepta[1,2-b]pyrrol-2-yl-acetic acid

Lösungsmittel

ethanol

water

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturcooling
2. 2
   workup.ADDITIONis added
3. 3
   Sonstigethe ethanol removed in vacuo
4. 4
   Filtrationthe mixture filtered
5. 5
   Sonstigethe supernatent aqueous solution is decanted from the yellow oil that forms
6. 6
   Waschenthe oil washed well with water
7. 7
   workup.DISSOLUTIONThe oil is then dissolved in ether
8. 8
   Trocknenthe ether solution dried
9. 9
   Einengenconcentrated to 20.3 mg (83%) of 5,10-dihydro-1,4-dimethyl-10-oxo-4H-benzo[5,6]cyclohepta[1,2-b]pyrrol-2-yl-acetic acid as a yellow oil

Vorschrift

To a suspension of methyl 5,10-dihydro-1,4-dimethyl-10-oxo-4H-benzo-[5,6]-cyclohepta[1,2-b]pyrrol-2-acetate (26 mg, 0.087 mmoles) in a mixture of 4 cc ethanol and 0.5 cc water, slight ice-bath cooling, is added 0.06 cc of 2.5 N sodium hydroxide solution. After stirring overnight (nitrogen atmosphere) at ambient temperatures, water (4 cc) is added, the ethanol removed in vacuo, the mixture filtered, and the filtrate acidified with 2 N hydrochloric acid. After aging, the supernatent aqueous solution is decanted from the yellow oil that forms, and the oil washed well with water. The oil is then dissolved in ether, the ether solution dried and concentrated to 20.3 mg (83%) of 5,10-dihydro-1,4-dimethyl-10-oxo-4H-benzo[5,6]cyclohepta[1,2-b]pyrrol-2-yl-acetic acid as a yellow oil.

Quelle