Pyridine → Isopropyl 5-[acetyl-(3,5-bistrifluoromethylbenzyl)amino]-8-bromo-2,3,4,5-tetrahydrobenzo[b]azepine-1-carboxylate

HRID 2353873Notes

Reaction equation

HRID 2353873 reaction equation
[C:1](OC(=O)C)(=[O:3])[CH3:2].[F:8][C:9]([F:41])([F:40])[C:10]1[CH:11]=[C:12]([CH:33]=[C:34]([C:36]([F:39])([F:38])[F:37])[CH:35]=1)[CH2:13][NH:14][CH:15]1[CH2:21][CH2:20][CH2:19][N:18]([C:22]([O:24][CH:25]([CH3:27])[CH3:26])=[O:23])[C:17]2[CH:28]=[C:29]([Br:32])[CH:30]=[CH:31][C:16]1=2.N1C=CC=CC=1>ClCCl>[C:1]([N:14]([CH2:13][C:12]1[CH:33]=[C:34]([C:36]([F:37])([F:38])[F:39])[CH:35]=[C:10]([C:9]([F:8])([F:40])[F:41])[CH:11]=1)[CH:15]1[CH2:21][CH2:20][CH2:19][N:18]([C:22]([O:24][CH:25]([CH3:27])[CH3:26])=[O:23])[C:17]2[CH:28]=[C:29]([Br:32])[CH:30]=[CH:31][C:16]1=2)(=[O:3])[CH3:2]

Participants

5

Reactant 3

HCID 1049PyridineHCID 7918Acetic AnhydrideHCID 86616064Isopropyl 5-(3,5-bistrifluoromethylbenzylamino)-8-bromo-2,3,4,5-tetrahydrobenzo[b]azepine-1-carboxylate

Product 1

HCID 59003154Isopropyl 5-[acetyl-(3,5-bistrifluoromethylbenzyl)amino]-8-bromo-2,3,4,5-tetrahydrobenzo[b]azepine-1-carboxylateYield 79.3%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Conditions

Temperature
0 °C

Procedure

Add 3,5-bis(trifluoromethyl)benzylamine (5.47 g, 22.5 mmol) followed by titanium isopropoxide (5.98 mL, 20.1 mmol) to a solution of isopropyl 8-bromo-5-oxo-2,3,4,5-tetrahydro benzo[b]azepine-1-carboxylate (5.24 g, 16.1 mmol) in tetrahydrofuran (20 mL) at room temperature under nitrogen was and stir the solution for 4 h. Dilute the reaction with methanol (40 mL) and slowly add sodium borohydride (0.912 g, 24.1 mmol) over 15 min to the reaction and stir at room temperature for 3.5 h. Quench the reaction with addition of 2 N NaOH (56 mL) and water (50 mL) and stir for 0.5 h. Filter the mixture and wash the solids with ethyl acetate/ethanol (4:1, 3×100 mL). Separate the filtrate and wash the organic layer with 2 N NaOH, 2 N HCl, and brine (50 mL each), then dry the solution over sodium sulfate, filter and remove the solvent under reduced pressure to afford isopropyl-5-(3,5-bistrifluoromethylbenzylamino)-8-bromo-2,3,4,5-tetrahydrobenzo[b]azepine-1-carboxylate as a white solid. Add acetic anhydride (22.6 mL, 241 mmol) dropwise to a suspension of isopropyl 5-(3,5-bistrifluoromethylbenzylamino)-8-bromo-2,3,4,5-tetrahydrobenzo[b]azepine-1-carboxylate (8.89 g, 16.1 mmol) and pyridine (19.6 mL g, 241 mmol) in dichloromethane (64 mL) under nitrogen cooled to 0° C. After the addition is complete, remove the cooling bath and warm the reaction to room temperature and stir for 12 h. Dilute the mixture with dichloromethane (100 mL) and wash with 2 N hydrochloric acid (2×50 mL), saturated aqueous sodium bicarbonate (50 mL) and brine (50 mL). Dry the organic layer over sodium sulfate, filter and remove the solvent under reduced pressure. Purify the residue using chromatography on silica gel, eluting with hexanes/ethyl acetate (60:40), to afford the title compound as a white solid (7.60 g, 79%, 2 steps): ESI MS 595 (M+H).

Workup

  1. additionAfter the addition
  2. customremove the cooling bath
  3. temperaturewarm
  4. customthe reaction to room temperature
  5. washwash with 2 N hydrochloric acid (2×50 mL), saturated aqueous sodium bicarbonate (50 mL) and brine (50 mL)
  6. dry with materialDry the organic layer over sodium sulfate
  7. filtrationfilter
  8. customremove the solvent under reduced pressure
  9. customPurify the residue
  10. washeluting with hexanes/ethyl acetate (60:40)

Sources & evidence

ORD record
ord-e492622d9b87456693d659694254ec7b
Source dataset
uspto-grants-2010_07
Patent number
US07749992B2

Reaction notes

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