Sodium hydride → tert-Butyl 9,10-dichloro-6-[2-(4-fluorophenoxy)ethyl]-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate

HRID 1071107Notes

Reaction equation

HRID 1071107 reaction equation
[H-].[Na+].[Cl:3][C:4]1[CH:12]=[CH:11][C:10]2[NH:9][C:8]3[CH2:13][CH2:14][N:15]([C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])[CH2:16][CH2:17][C:7]=3[C:6]=2[C:5]=1[Cl:25].[F:26][C:27]1[CH:36]=[CH:35][C:30]([O:31][CH2:32][CH2:33]Br)=[CH:29][CH:28]=1>CN(C=O)C>[Cl:3][C:4]1[CH:12]=[CH:11][C:10]2[N:9]([CH2:33][CH2:32][O:31][C:30]3[CH:35]=[CH:36][C:27]([F:26])=[CH:28][CH:29]=3)[C:8]3[CH2:13][CH2:14][N:15]([C:18]([O:20][C:21]([CH3:22])([CH3:24])[CH3:23])=[O:19])[CH2:16][CH2:17][C:7]=3[C:6]=2[C:5]=1[Cl:25]

Participants

5

Reactant 3

HCID 24758Sodium hydrideHCID 20641711-(2-Bromoethoxy)-4-fluorobenzeneHCID 22396855tert-butyl 9,10-dichloro-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate

Product 1

HCID 22396705tert-Butyl 9,10-dichloro-6-[2-(4-fluorophenoxy)ethyl]-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylateYield 84.8%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

Sodium hydride (60% dispersion in mineral oil, 68 mg, 1.7 mmol) was added to a solution of tert-butyl 9,10-dichloro-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate (0.40 g, 1.1 mmol) in DMF (6 mL). After 25 min, 4-fluorophenoxy ethyl bromide (0.34 mL, 2.3 mmol) was added. The reaction was quenched with saturated aqueous NH4Cl after 22 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, 40M) with heptane/EtOAc (17:3) to give 0.46 g (82%) of a white solid: mp 163.5-165.5° C.; 1H NMR (300 MHz, CDCl3) δ 7.16 (m, 2H), 6.92 (m, 2H), 6.70 (m, 2H), 4.44 (m, 2H), 4.12 (m, 2H), 3.73 (m, 4H), 3.51 (m, 2H), 3.12 (m, 2H), 1.48 (s, 9H); IR (diffuse reflectance) 1675, 1507, 1449, 1405, 1365, 1354, 1298, 1249, 1242, 1221, 1209, 1170, 1120, 835, 828 cm−1; MS (FAB) m/z 493 (M+H+), 494, 493, 492, 439, 438, 437, 436, 435, 57, 42; HRMS (EI) calcd for C25H27Cl2FN2O3 492.1383, found 492.1385; Anal. Calcd for C25H27Cl2FN2O3: C, 60.86; H, 5.51; N, 5.68; found: C, 60.93; H, 5.60; N, 5.69.

Workup

  1. customThe reaction was quenched with saturated aqueous NH4Cl after 22 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, 40M) with heptane/EtOAc (17:3)

Sources & evidence

ORD record
ord-a9dda6e127a04571877974caddcd0248
Source dataset
uspto-grants-2005_06
Patent number
US06903090B2

Reaction notes

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