Ethanol → ethyl 4,5,6,7-tetrahydro-1H-indole-2-carboxylate

HRID 1021573Notes

Reaction equation

HRID 1021573 reaction equation
ClC(Cl)(Cl)[C:3]([C:5]1[NH:6][C:7]2[CH2:8][CH2:9][CH2:10][CH2:11][C:12]=2[CH:13]=1)=[O:4].[O-][CH2:17][CH3:18].[Na+].C([OH:22])C>>[NH:6]1[C:7]2[CH2:8][CH2:9][CH2:10][CH2:11][C:12]=2[CH:13]=[C:5]1[C:3]([O:4][CH2:17][CH3:18])=[O:22]

Participants

4

Reactant 3

HCID 702EthanolHCID 2723922Sodium ethoxideHCID 670161542,2,2-trichloro-1-(4,5,6,7-tetrahydro-1H-indol-2-yl)ethanone

Product 1

HCID 300702ethyl 4,5,6,7-tetrahydro-1H-indole-2-carboxylateYield 100%

Procedure

A 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer and nitrogen inlet was purged with nitrogen and charged with 101a (6.50 g, 24.8 mmol), sodium ethoxide (17.0 mg, 0.25 mmol) and ethanol (40 mL). The solution was stirred at room temperature for 1 h. After that time, the reaction mixture was concentrated under reduced pressure. The residue was purified by column chromatography to afford a 100% yield (4.80 g) of ethyl 4,5,6,7-tetrahydro-1H-indole-2-carboxylate 101b as a brown solid: mp 70-72° C.; 1H NMR (300 MHz, CDCl3) δ 9.08 (s, 1H), 6.75 (s, 1H), 4.25 (q, 2H, J=7.2 Hz), 2.65 (t, 2H, J=6.0 Hz), 2.56 (t, 2H, J=6.0 Hz), 1.85 (m, 4H), 1.28 (t, 3H, J=7.2 Hz); MS (ESI+) m/z 194.1 (M+H)

Workup

  1. customA 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer and nitrogen inlet
  2. customwas purged with nitrogen
  3. concentrationAfter that time, the reaction mixture was concentrated under reduced pressure
  4. customThe residue was purified by column chromatography

Sources & evidence

ORD record
ord-751193bace754437b9b4525874fb84e1
Source dataset
uspto-grants-2014_05
Patent number
US08716274B2

Reaction notes

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