Hydrochloric Acid → (+/-)-Isopropyl 5-[acetyl-(3,5-bistrifluoromethylbenzyl)amino]-6-methyl-tetrahydrobenzo[b]azepine-1-carboxylate

HRID 2353946Notes

Reaction equation

HRID 2353946 reaction equation
[C:1](OC(=O)C)(=[O:3])[CH3:2].[CH:8]([O:11][C:12]([N:14]1[CH2:20][CH2:19][CH2:18][CH:17]([NH:21][CH2:22][C:23]2[CH:28]=[C:27]([C:29]([F:32])([F:31])[F:30])[CH:26]=[C:25]([C:33]([F:36])([F:35])[F:34])[CH:24]=2)[C:16]2[C:37]([CH3:41])=[CH:38][CH:39]=[CH:40][C:15]1=2)=[O:13])([CH3:10])[CH3:9].N1C=CC=CC=1.Cl>ClCCl>[C:1]([N:21]([CH2:22][C:23]1[CH:28]=[C:27]([C:29]([F:30])([F:32])[F:31])[CH:26]=[C:25]([C:33]([F:34])([F:35])[F:36])[CH:24]=1)[CH:17]1[CH2:18][CH2:19][CH2:20][N:14]([C:12]([O:11][CH:8]([CH3:10])[CH3:9])=[O:13])[C:15]2[CH:40]=[CH:39][CH:38]=[C:37]([CH3:41])[C:16]1=2)(=[O:3])[CH3:2]

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 1049PyridineHCID 7918Acetic AnhydrideHCID 86616077(+/-)-5-(3,5-Bis-trifluoromethyl-benzylamino)-6-methyl-2,3,4,5-tetrahydro-benzo[b]azepine-1-carboxylic acid isopropyl ester

Product 1

HCID 59003181(+/-)-Isopropyl 5-[acetyl-(3,5-bistrifluoromethylbenzyl)amino]-6-methyl-tetrahydrobenzo[b]azepine-1-carboxylateYield 96%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Add 3,5-bis(trifluoromethyl)benzylamine (423 mg, 1.62 mmol) followed by titanium isopropoxide (645 mg, 2.27 mmol) to 6-Methyl-5-oxo-2,3,4,5-tetrahydro-benzo[b]azepine-1-carboxylic acid isopropyl ester (423 mg, 1.62 mmol) at room temperature under an atmosphere of nitrogen and stir the solution for 14 h. Add methanol (6.7 mL) and sodium borohydride (92 mg, 2.43 mmol) and stir the mixture under nitrogen at room temperature for 45 min. Add 0.1M NaOH, stir for 30 min. Filter through celite and wash the residue with AcOEt. Separate organic layer, extract aqueous with AcOEt. Wash organic layer with brine and dry the organic layers over anhydrous sodium sulfate. Filter and remove the solvent under reduced pressure. Purify the residue by flash chromatography, eluting with hexanes/ethyl acetate, to afford (+/−)-5-(3,5-Bis-trifluoromethyl-benzylamino)-6-methyl-2,3,4,5-tetrahydro-benzo[b]azepine-1-carboxylic acid isopropyl ester (27 mg, 3%). Add acetic anhydride (0.037 mL, 0.39 mmol) dropwise to a solution of the amine (27 mg, 0.055 mmol) and pyridine (0.038 mL, 0.43 mmol) in dichloromethane (0.5 mL). Stir under nitrogen at room temperature for 14 h. Add 1 M hydrochloric acid and extract with dichloromethane. Dry the organic layer over anhydrous sodium sulfate, filter and remove the solvent under reduced pressure. Purify the residue by flash chromatography, eluting with hexanes/ethyl acetate, to afford the title compound (28 mg, 96%); MS (ES+): 531 (M+H).

Workup

  1. extractionextract with dichloromethane
  2. dry with materialDry the organic layer over anhydrous sodium sulfate
  3. filtrationfilter
  4. customremove the solvent under reduced pressure
  5. customPurify the residue by flash chromatography
  6. washeluting with hexanes/ethyl acetate

Sources & evidence

ORD record
ord-e49c6261fc42452bb122da6dec0ac5a7
Source dataset
uspto-grants-2010_07
Patent number
US07749992B2

Reaction notes

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