Pyridine → 5-[Acetyl-(3,5-bis-trifluoromethyl-benzyl)-amino]-7-trifluoromethyl-2,3,4,5-tetrahydro-benzo[b]azepine-1-carboxylic acid tert-butyl ester

HRID 2353964Notes

Reaction equation

HRID 2353964 reaction equation
[C:1](Cl)(=[O:3])[CH3:2].N1C=CC=CC=1.[C:11]([O:15][C:16]([N:18]1[CH2:24][CH2:23][CH2:22][CH:21]([NH:25][CH2:26][C:27]2[CH:32]=[C:31]([C:33]([F:36])([F:35])[F:34])[CH:30]=[C:29]([C:37]([F:40])([F:39])[F:38])[CH:28]=2)[C:20]2[CH:41]=[C:42]([C:45]([F:48])([F:47])[F:46])[CH:43]=[CH:44][C:19]1=2)=[O:17])([CH3:14])([CH3:13])[CH3:12]>ClCCl>[C:11]([O:15][C:16]([N:18]1[CH2:24][CH2:23][CH2:22][CH:21]([N:25]([C:1](=[O:3])[CH3:2])[CH2:26][C:27]2[CH:28]=[C:29]([C:37]([F:40])([F:38])[F:39])[CH:30]=[C:31]([C:33]([F:36])([F:34])[F:35])[CH:32]=2)[C:20]2[CH:41]=[C:42]([C:45]([F:48])([F:46])[F:47])[CH:43]=[CH:44][C:19]1=2)=[O:17])([CH3:14])([CH3:12])[CH3:13]

Participants

5

Reactant 3

HCID 1049PyridineHCID 6367Acetyl chlorideHCID 86616081(+/-)-t-Butyl-5-(3,5-bistrifluoromethylbenzylamino)-7-trifluoromethyl-2,3,4,5-tetrahydrobenzo[b]azepine-1-carboxylate

Product 1

HCID 590030995-[Acetyl-(3,5-bis-trifluoromethyl-benzyl)-amino]-7-trifluoromethyl-2,3,4,5-tetrahydro-benzo[b]azepine-1-carboxylic acid tert-butyl esterYield 83%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Add 3,5-bis(trifluoromethyl)benzylamine (0.1 g, 0.4 mmol) followed by titanium isopropoxide (1.0 mL) to 5-Oxo-7-trifluoromethyl-2,3,4,5-tetrahydro-benzo[b]azepine-1-carboxylic acid tert-butyl ester (0.13 g, 0.4 mmol) and stir at room temperature overnight. Dilute the mixture with 5 mL of Methanol and add sodium borohydride (0.8 mmol). Stir the suspension at room temperature for 30 min then dilute with water (20 mL) and ethyl acetate (20 mL). Filter the resulting emulsion through celite and wash with ethyl acetate (3×20 mL). Separate the organics, dry over sodium sulfate, and filter. Remove the solvent under vacuum to afford (+/−)-t-butyl-5-(3,5-bistrifluoromethylbenzylamino)-7-trifluoromethyl-2,3,4,5-tetrahydrobenzo[b]azepine-1-carboxylate crude (0.2 g, MS (ES+): 557 (M+H)). Without further purification, add acetyl chloride (0.8 mmol) and pyridine (0.8 mmol) to a solution of (+/−)-t-butyl-5-(3,5-bistrifluoromethylbenzylamino)-7-trifluoromethyl-2,3,4,5-tetrahydrobenzo[b]azepine-1-carboxylate in dichloromethane. After stirring for 2 h remove solvent under vacuum and chromatograph over silica gel using ethyl acetate/hexane (5-40%) to elute. This affords the title compound as an oil (0.2 g, 83%) which foams under vacuum: MS (ES−): 597 (M−H).

Workup

  1. customWithout further purification
  2. customremove solvent under vacuum and chromatograph over silica gel
  3. washto elute

Sources & evidence

ORD record
ord-7a5596f6073049ceac253bd3a6c572cd
Source dataset
uspto-grants-2010_07
Patent number
US07749992B2

Reaction notes

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