Methanol → methyl 1H-indole-5-carboxylate

HRID 348947Notes

Reaction equation

HRID 348947 reaction equation
[NH:1]1[C:9]2[C:4](=[CH:5][C:6]([C:10]([OH:12])=[O:11])=[CH:7][CH:8]=2)[CH:3]=[CH:2]1.[CH2:13](N(CC)CC)C.CO>C1COCC1>[NH:1]1[C:9]2[C:4](=[CH:5][C:6]([C:10]([O:12][CH3:13])=[O:11])=[CH:7][CH:8]=2)[CH:3]=[CH:2]1

Participants

5

Reactant 3

HCID 887MethanolHCID 8471TriethylamineHCID 742801H-Indole-5-Carboxylic Acid

Product 1

HCID 2737635methyl 1H-indole-5-carboxylateYield 24.3%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a mixture of indole-5-carboxylic acid (3.0 g) and triethylamine (1.9 g) in dry THF (100 mL) was added 1,1-carbonyldiimidazole (3.08 g). The mixture was stirred for 30 minutes at room temperature, at which time methanol (25 mL) was added. The mixture was stirred at room temperature for 1 h, partitioned between water and ethyl acetate. The layers were separated and the organic layer washed twice with water, dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. Column chromatography on silica gel (200 mL) using CH2Cl2 as eluent to give 0.794 g of the title compound: 1H NMR (CDCl3) δ 3.93, 6.66, 7.28, 7.41, 7.91, 8.34, 8.42.

Workup

  1. additionwas added
  2. custompartitioned between water and ethyl acetate
  3. customThe layers were separated
  4. washthe organic layer washed twice with water
  5. dry with materialdried over anhydrous magnesium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-864ae26a90d8450ea2c33a9aad801506
Source dataset
uspto-grants-2007_02
Patent number
US07176242B2

Reaction notes

Loading…