Potassium Hydroxide → 1,2,3,3a,8,8a-Hexahydro-alpha-oxo-1,3a,8-trimethyl-5-pyrrolo[2,3-b]indole acetic acid
Reaction equation
[O:1]=[C:2]([C:8]1[CH:9]=[C:10]2[C:14](=[CH:15][CH:16]=1)[N:13]([CH3:17])[CH:12]1[N:18]([CH3:21])[CH2:19][CH2:20][C:11]21[CH3:22])[C:3]([O:5]CC)=[O:4].[OH-].[K+]>C(O)C.O>[O:1]=[C:2]([C:8]1[CH:9]=[C:10]2[C:14](=[CH:15][CH:16]=1)[N:13]([CH3:17])[CH:12]1[N:18]([CH3:21])[CH2:19][CH2:20][C:11]21[CH3:22])[C:3]([OH:5])=[O:4]Participants
Reactant 2
Product 1
Reagents, catalysts & solvents 2
Conditions
- Temperature
- 0 °C
Procedure
To a 0° C. solution of 1,2,3,3a,8,8a-hexahydro-α-oxo-1,3a,8-trimethyl-5-pyrrolo[2,3-b]indole acetic acid, ethyl ester (0.25 g) in 95% ethanol (1.0 ml) was added a solution of 0.14 g of KOH in water (1.0 ml). The mixture was stirred at 0° C. for 30 minutes and then refluxed for 4 hours. The solution was cooled, the ethanol was removed under reduced pressure and the remaining aqueous residue was diluted with water (3.0 ml), cooled to 0° C. and neutralized with a 1.0N aqueous HCl solution. The water was then removed and the residue was taken up in dichloromethane and washed with water to remove any unreacted starting material. The aqueous washes were then concentrated to afford 1,2,3,3a,8,8a-hexahydro-α-oxo-1,3a,8-trimethyl-5-pyrrolo[2,3-b]indole acetic acid as a solid.
Workup
- temperaturerefluxed for 4 hours
- temperatureThe solution was cooled
- customthe ethanol was removed under reduced pressure
- additionthe remaining aqueous residue was diluted with water (3.0 ml)
- temperaturecooled to 0° C.
- customThe water was then removed
- washwashed with water
- customto remove
- concentrationThe aqueous washes were then concentrated
Sources & evidence
- ORD record
- ord-3e92a44fe82e41a0a7895e5206f17da2
- Source dataset
- uspto-grants-1992_12
- Patent number
- US05173497
Reaction notes
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