P-Anisidine → tert-butyl 6-[3-(4-methoxyanilino)-3-oxopropyl]-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate

HRID 1071075Notes

Reaction equation

HRID 1071075 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:21][CH2:20][C:19]2[C:18]3[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=3[N:12]([CH2:22][CH2:23][C:24]([OH:26])=O)[C:11]=2[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[CH3:27][O:28][C:29]1[CH:34]=[CH:33][C:32]([NH2:35])=[CH:31][CH:30]=1.CN(C1C=CC=CN=1)C.C(N=C=NC(C)C)(C)C>C1COCC1.CCOC(C)=O>[CH3:27][O:28][C:29]1[CH:34]=[CH:33][C:32]([NH:35][C:24](=[O:26])[CH2:23][CH2:22][N:12]2[C:13]3[CH:14]=[CH:15][CH:16]=[CH:17][C:18]=3[C:19]3[CH2:20][CH2:21][N:8]([C:6]([O:5][C:1]([CH3:4])([CH3:3])[CH3:2])=[O:7])[CH2:9][CH2:10][C:11]2=3)=[CH:31][CH:30]=1

Participants

7

Reactant 4

HCID 7732P-AnisidineHCID 12734DiisopropylcarbodiimideHCID 218852-DimethylaminopyridineHCID 223970103-(3-(tert-butoxycarbonyl)-2,3,4,5-tetrahydroazepino[4,5-b]indol-6(1H)-yl)propanoic acid

Product 1

HCID 22396876tert-butyl 6-[3-(4-methoxyanilino)-3-oxopropyl]-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylateYield 84%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent

Procedure

3-(3-(tert-butoxycarbonyl)-2,3,4,5-tetrahydroazepino[4,5-b]indol-6(1H)-yl)propanoic acid (0.105 g, 0.292 mmol), p-anisidine (0.0377 g, 0.306 mmol, 1.05 equiv.) and dimethylaminopyridine (0.0357 g, 0.292 mmol, 1.00 equiv.) were dissolved in THF at rt under N2. Diisopropylcarbodiimide (0.0503 mL, 0.0405 g, 0.321 mmol, 1.00 equiv.) was added, then the reaction mixture was stirred for 29 h. The reaction mixture was taken up in EtOAc and washed with 10% aq. citric acid (2×), saturated aq. NaHCO3 (2×) and brine (1×). The organic layer was dried over MgSO4, filtered, and concentrated. The crude product (0.1686 g) was chromatographed (SiO2 25 g, eluted with 9:1 toluene: acetone) to give tert-butyl 6-[3-(4-methoxyanilino)-3-oxopropyl]-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate (0.113 g) in 84% yield. 1H NMR (300 MHz, CDCl3) δ 1.47, 2.68-2.76, 2.95-3.08, 3.56-3.70, 3.79, 4.53, 6.83, 7.12-7.54; MS (ESI+) for C27H33N3O4 m/z 464.0 (M+H)+.

Workup

  1. washwashed with 10% aq. citric acid (2×), saturated aq. NaHCO3 (2×) and brine (1×)
  2. dry with materialThe organic layer was dried over MgSO4
  3. filtrationfiltered
  4. concentrationconcentrated
  5. customThe crude product (0.1686 g) was chromatographed
  6. wash(SiO2 25 g, eluted with 9:1 toluene: acetone)

Sources & evidence

ORD record
ord-633d9a03300f43e28ac91d893d096389
Source dataset
uspto-grants-2005_06
Patent number
US06903090B2

Reaction notes

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