Sodium Carbonate → 8-(3-Methoxyphenyl)-1,2,3,6-tetrahydroazepino[4,5-B]indole-5-carboxylic acid ethyl ester

HRID 1094588Notes

Reaction equation

HRID 1094588 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[C:12]2[NH:13][C:14]3[CH:15]=[C:16]([C:20]4[CH:25]=[CH:24][CH:23]=[C:22]([O:26][CH3:27])[CH:21]=4)[CH:17]=[CH:18][C:19]=3[C:11]=2[CH2:10][CH2:9][N:8](C(=O)C2C=CC(F)=CC=2)[CH:7]=1)=[O:5])[CH3:2].C([O-])([O-])=O.[Na+].[Na+]>CCO.C(Cl)Cl>[CH2:1]([O:3][C:4]([C:6]1[C:12]2[NH:13][C:14]3[CH:15]=[C:16]([C:20]4[CH:25]=[CH:24][CH:23]=[C:22]([O:26][CH3:27])[CH:21]=4)[CH:17]=[CH:18][C:19]=3[C:11]=2[CH2:10][CH2:9][NH:8][CH:7]=1)=[O:5])[CH3:2]

Participants

5

Reactant 2

HCID 10340Sodium CarbonateHCID 575591333-(4-Fluorobenzoyl)-8-(3-methoxyphenyl)-1,2,3,6-tetrahydroazepino[4,5-B]indole-5-carboxylic acid ethyl ester

Product 1

HCID 575591088-(3-Methoxyphenyl)-1,2,3,6-tetrahydroazepino[4,5-B]indole-5-carboxylic acid ethyl esterYield 91.1%

Reagents, catalysts & solvents 2

HCID 702EthanolSolventHCID 6344DichloromethaneSolvent

Conditions

Temperature
93 °C

Procedure

To a stirred solution of 3-(4-fluorobenzoyl)-8-(3-methoxyphenyl)-1,2,3,6-tetrahydroazepino[4,5-b]indole-5-carboxylic acid ethyl ester (48 mg, 0.10 mmol) in 2 mL of EtOH was added 0.30 mL of 1M Na2CO3 solution at ambient temperature. The reaction mixture was heated at 93° C. reflux under N2 for 3.5 hours and samples monitored by LC-MS. The solution was diluted with DCM (10 mL), washed with brine. The aqueous phase was extracted with DCM (10 mL) twice. The combined organic phase was dried over Na2SO4 and concentrated. The crude product was purified by flash chromatograph on silica gel, eluting with EtOAc-hexane (0-30%) to yield the title compound (33 mg) as a yellow solid; 1H-NMR (CDCl3): δ10.46 (1H, s), 7.73 (1H, d), 7.47 (1H, d), 7.37 (1H, d), 7.26 (2H, m), 7.12 (1H, m), 7.00 (1H, m), 6.79 (1H, m), 5.25 (1H, s), 4.21 (2H, m), 3.80 (3H, s), 3.55 (2H, m), 3.11 (2H, m), 1.26 (3H, t). MS (ESI): 363 (MH+).

Workup

  1. temperaturereflux under N2 for 3.5 hours
  2. washwashed with brine
  3. extractionThe aqueous phase was extracted with DCM (10 mL) twice
  4. dry with materialThe combined organic phase was dried over Na2SO4
  5. concentrationconcentrated
  6. customThe crude product was purified by flash chromatograph on silica gel
  7. washeluting with EtOAc-hexane (0-30%)

Sources & evidence

ORD record
ord-6f326c859f134cd9af9e09fbc4f5dfd9
Source dataset
uspto-grants-2012_03
Patent number
US08133992B2

Reaction notes

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