tert-Butyl 2-(1-ethoxy-2-methyl-1-oxopropan-2-yl)-1H-indole-1-carboxylate → Ethyl 2-(1H-indol-2-yl)-2-methylpropanoate

HRID 1991741Notes

Reaction equation

HRID 1991741 reaction equation
[CH2:1]([O:3][C:4]([C:6]([C:9]1[N:10](C(OC(C)(C)C)=O)[C:11]2[C:16]([CH:17]=1)=[CH:15][CH:14]=[CH:13][CH:12]=2)([CH3:8])[CH3:7])=[O:5])[CH3:2]>ClCCl.C(O)(C(F)(F)F)=O>[NH:10]1[C:11]2[C:16](=[CH:15][CH:14]=[CH:13][CH:12]=2)[CH:17]=[C:9]1[C:6]([CH3:7])([CH3:8])[C:4]([O:3][CH2:1][CH3:2])=[O:5]

Participants

4

Reactant 1

HCID 53439126tert-Butyl 2-(1-ethoxy-2-methyl-1-oxopropan-2-yl)-1H-indole-1-carboxylate

Product 1

HCID 53438556Ethyl 2-(1H-indol-2-yl)-2-methylpropanoateYield 78.2%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 6422Trifluoroacetic acidSolvent

Procedure

tert-Butyl 2-(2-(ethoxycarbonyl)propan-2-yl)-1H-indole-1-carboxylate (22.9 g, 69.1 mmol) was dissolved in dichloromethane (200 mL) before TFA (70 mL) was added. The mixture was stirred for 5 h at room temperature. The mixture was evaporated to dryness, taken up in dichloromethane and washed with saturated sodium bicarbonate solution, water, and brine. The product was purified by column chromatography on silica gel (0-20% EtOAc in hexane) to give ethyl 2-(1H-indol-2-yl)-2-methylpropanoate (12.5 g, 78%).

Workup

  1. additionwas added
  2. customThe mixture was evaporated to dryness
  3. washwashed with saturated sodium bicarbonate solution, water, and brine
  4. customThe product was purified by column chromatography on silica gel (0-20% EtOAc in hexane)

Sources & evidence

ORD record
ord-5cb35c6924154f1e88512680f63544fe
Source dataset
uspto-grants-2010_01
Patent number
US07645789B2

Reaction notes

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