Ethyl bromoacetate → tert-Butyl 9,10-dichloro-6-(2-ethoxy-2-oxoethyl)-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate

HRID 2306990Notes

Reaction equation

HRID 2306990 reaction equation
[Cl:1][C:2]1[CH:10]=[CH:9][C:8]2[NH:7][C:6]3[CH2:11][CH2:12][N:13]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:14][CH2:15][C:5]=3[C:4]=2[C:3]=1[Cl:23].[H-].[Na+].Br[CH2:27][C:28]([O:30][CH2:31][CH3:32])=[O:29]>CN(C=O)C>[Cl:1][C:2]1[CH:10]=[CH:9][C:8]2[N:7]([CH2:27][C:28]([O:30][CH2:31][CH3:32])=[O:29])[C:6]3[CH2:11][CH2:12][N:13]([C:16]([O:18][C:19]([CH3:20])([CH3:22])[CH3:21])=[O:17])[CH2:14][CH2:15][C:5]=3[C:4]=2[C:3]=1[Cl:23]

Participants

5

Reactant 3

HCID 7748Ethyl bromoacetateHCID 24758Sodium hydrideHCID 22396855tert-butyl 9,10-dichloro-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate

Product 1

HCID 22396818tert-Butyl 9,10-dichloro-6-(2-ethoxy-2-oxoethyl)-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylateYield 70%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of tert-butyl 9,10-dichloro-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate (0.10 g, 0.28 mmol) in DMF (2 mL), sodium hydride (60% dispersion in mineral oil, 17 mg, 0.42 mmol) was added. After 15 min, ethyl bromoacetate(0.060 mL, 0.56 mmol) was added. The reaction was quenched with saturated aqueous NH4Cl after 2.5 h and extracted with EtOAc (3×15 mL). The combined organic extracts were washed with brine, dried over Na2SO4, decanted, and concentrated. The crude product was purified by column chromatography (Biotage, 40S) with heptane/EtOAc (3:1) to give 85 mg (70%) of a white solid: mp 136.5-138.0° C.; 1H NMR (300 MHz, CDCl3) δ 7.19 (d, J=8.7 Hz, 1H), 6.99 (d, J=8.7 Hz, 1H), 4.74 (s, 2H), 4.21 (dd, J=7.1, 7.1 Hz, 2H), 3.75 (m, 4H), 3.53 (m, 2H), 2.93 (m, 2H), 1.48 (s, 9H), 1.26 (t, J=7.1 Hz, 3H); IR (diffuse reflectance) 2985, 2976, 1737, 1685, 1466, 1450, 1414, 1367, 1344, 1249, 1213, 1169, 1156, 1115, 926 cm−1; MS (EI) m/z 440 (M+), 307, 305, 301, 299, 298, 272, 225, 189, 58, 56; Anal. Calcd for C21H26Cl2N2O4: C, 57.15; H, 5.94; N, 6.35, found: C, 57.16; H, 5.98; N, 6.27.

Workup

  1. customThe reaction was quenched with saturated aqueous NH4Cl after 2.5 h
  2. extractionextracted with EtOAc (3×15 mL)
  3. washThe combined organic extracts were washed with brine
  4. dry with materialdried over Na2SO4
  5. customdecanted
  6. concentrationconcentrated
  7. customThe crude product was purified by column chromatography (Biotage, 40S) with heptane/EtOAc (3:1)

Sources & evidence

ORD record
ord-c650eb3cf09f4df38ab93489d9337f7d
Source dataset
uspto-grants-2004_12
Patent number
US06828314B2

Reaction notes

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