Sodium Bicarbonate → (+/-)-9-(3,5-bis-trifluoromethyl-benzylamino)-2,3,6,7,8,9-hexahydro-1H-5-aza-cyclohepta[f]indene-5-carboxylic acid isopropyl ester

HRID 2353928Notes

Reaction equation

HRID 2353928 reaction equation
[F:1][C:2]([F:16])([F:15])[C:3]1[CH:4]=[C:5]([CH:8]=[C:9]([C:11]([F:14])([F:13])[F:12])[CH:10]=1)[CH2:6][NH2:7].[CH:17]([O:20][C:21]([N:23]1[C:36]2[C:28](=[CH:29][C:30]3[CH2:31][CH2:32][CH2:33][C:34]=3[CH:35]=2)[C:27](=O)[CH2:26][CH2:25][CH2:24]1)=[O:22])([CH3:19])[CH3:18].[BH4-].[Na+].C(=O)(O)[O-].[Na+]>CC(C)[O-].[Ti+4].CC(C)[O-].CC(C)[O-].CC(C)[O-].CO>[CH:17]([O:20][C:21]([N:23]1[C:36]2[C:28](=[CH:29][C:30]3[CH2:31][CH2:32][CH2:33][C:34]=3[CH:35]=2)[CH:27]([NH:7][CH2:6][C:5]2[CH:4]=[C:3]([C:2]([F:15])([F:16])[F:1])[CH:10]=[C:9]([C:11]([F:14])([F:12])[F:13])[CH:8]=2)[CH2:26][CH2:25][CH2:24]1)=[O:22])([CH3:19])[CH3:18]

Participants

7

Reactant 4

HCID 516892Sodium BicarbonateHCID 5210993,5-Bis(trifluoromethyl)benzylamineHCID 4311764Sodium borohydrideHCID 593791389-oxo-2,3,6,7,8,9-hexahydro-1H-5-aza-cyclohepta[f]indene-5-carboxylic acid isopropyl ester

Product 1

HCID 86615658(+/-)-9-(3,5-bis-trifluoromethyl-benzylamino)-2,3,6,7,8,9-hexahydro-1H-5-aza-cyclohepta[f]indene-5-carboxylic acid isopropyl esterYield 61.1%

Reagents, catalysts & solvents 2

HCID 11026Titanium isopropoxideCatalystHCID 887MethanolSolvent

Procedure

Add 3,5-bis(trifluoromethyl)benzylamine (187 mg, 0.77 mmol) followed by titanium isopropoxide (835 mg, 2.94 mmol) to 9-Oxo-2,3,6,7,8,9-hexahydro-1H-5-aza-cyclohepta[f]indene-5-carboxylic acid isopropyl ester (200 mg, 0.7 mmol) at room temperature under an atmosphere of nitrogen and stir the solution for 3 days. Add methanol (3 mL) and sodium borohydride (40 mg, 1.05 mmol) and stir the mixture under nitrogen at room temperature for 16 hours. Add sodium bicarbonate saturated solution. 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 silica cartridge, eluting with hexanes/ethyl acetate 9:1, to afford of (+/−)-9-(3,5-bis-trifluoromethyl-benzylamino)-2,3,6,7,8,9-hexahydro-1H-5-aza-cyclohepta[f]indene-5-carboxylic acid isopropyl ester (220 mg). Add acetic anhydride (0.22 mL, 2.33 mmol) dropwise to a solution of the amine (80 mg, 0.155 mmol) and pyridine (0.18 mL, 2.33 mmol) in dichloromethane (1 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 silica gel cartridge, eluting with hexanes/ethyl acetate 4:1, to afford the title compound (64 mg, 74%); MS (ES+): 579 (M+H+Na).

Workup

  1. filtrationFilter through celite
  2. washwash the residue with AcOEt
  3. extractionSeparate organic layer, extract aqueous with AcOEt
  4. dry with materialWash organic layer with brine and dry the organic layers over anhydrous sodium sulfate
  5. filtrationFilter
  6. customremove the solvent under reduced pressure
  7. customPurify the residue by silica cartridge
  8. washeluting with hexanes/ethyl acetate 9:1

Sources & evidence

ORD record
ord-507a86a470a04c06a99882beb588d829
Source dataset
uspto-grants-2010_07
Patent number
US07749992B2

Reaction notes

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