p-Chlorophenethylic alcohol → 1,2,3,3a,8,8a-Hexahydro-alpha-oxo-1,3a,8-trimethyl-5-pyrrolo[2,3-b]indole acetic acid, 4-chlorophenylethyl ester

HRID 1681641Notes

Reaction equation

HRID 1681641 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][CH2:6][CH3:7])=[O:4].[Cl:23][C:24]1[CH:29]=[CH:28][C:27](CCO)=[CH:26][CH:25]=1>[O-]CC.[Ti+4].[O-]CC.[O-]CC.[O-]CC>[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][CH2:6][CH2:7][C:27]1[CH:28]=[CH:29][C:24]([Cl:23])=[CH:25][CH:26]=1)=[O:4]

Participants

4

Reactant 2

HCID 74647p-Chlorophenethylic alcoholHCID 867464181,2,3,3a,8,8a-Hexahydro-alpha-oxo-1,3a,8-trimethyl-5-pyrrolo[2,3-b]indole acetic acid, ethyl ester

Product 1

HCID 867464231,2,3,3a,8,8a-Hexahydro-alpha-oxo-1,3a,8-trimethyl-5-pyrrolo[2,3-b]indole acetic acid, 4-chlorophenylethyl ester

Reagents, catalysts & solvents 1

HCID 76524Titanium tetraethoxideCatalyst

Procedure

To a chilled (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 (1.18 g) in 4-chlorophenylethyl alcohol (31 ml) was added titanium (IV) ethoxide (0.30 ml) under a nitrogen atmosphere with stirring. The mixture was gently heated without refluxing for 4 hours. The 4-chlorophenylethyl alcohol was removed by distillation under high vacuum and the crude residue was dissolved in dichloromethane (20 ml) and washed successively with two 100 ml portions of saturated ammonium chloride solution, two 100 ml portions of saturated sodium bicarbonate solution and 100 ml of brine. The organic phase was dried (Na2SO4) filtered, and purified using preparative HPLC (silica gel, 3% methanol in dichloromethane as the loading solvent and eluent). The appropriate fractions were combined and the solvent removed under vacuum. Concentration of the appropriate fractions yielded 0.87 g of 1,2,3,3a,8,8a-hexahydro-α-oxo-1,3a,8-trimethyl-5-pyrrolo[2,3-b]indole acetic acid, 4 -chlorophenylethyl ester as an oil.

Workup

  1. temperatureThe mixture was gently heated
  2. temperaturewithout refluxing for 4 hours
  3. customThe 4-chlorophenylethyl alcohol was removed by distillation under high vacuum
  4. dissolutionthe crude residue was dissolved in dichloromethane (20 ml)
  5. washwashed successively with two 100 ml portions of saturated ammonium chloride solution, two 100 ml portions of saturated sodium bicarbonate solution and 100 ml of brine
  6. dry with materialThe organic phase was dried (Na2SO4)
  7. filtrationfiltered
  8. custompurified
  9. customthe solvent removed under vacuum

Sources & evidence

ORD record
ord-863e7841a25a4f90883cb04673ce45be
Source dataset
uspto-grants-1992_12
Patent number
US05173497

Reaction notes

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