Diisopropylethylamine → tert-Butyl (3R)-3-[{[2,2-dimethyl-3-oxo-7-(trifluoromethyl)-4-(2-{[1-(trifluoromethyl)propyl]amino}-ethyl)-3,4-dihydro-2H-1,4-benzoxazin-6-yl]carbonyl}(isopropyl)amino]piperidine-1-carboxylate

HRID 1942506Notes

Reaction equation

HRID 1942506 reaction equation
[NH2:1][CH2:2][CH2:3][N:4]1[C:9]2[CH:10]=[C:11]([C:18]([N:20]([CH:34]([CH3:36])[CH3:35])[C@@H:21]3[CH2:26][CH2:25][CH2:24][N:23]([C:27]([O:29][C:30]([CH3:33])([CH3:32])[CH3:31])=[O:28])[CH2:22]3)=[O:19])[C:12]([C:14]([F:17])([F:16])[F:15])=[CH:13][C:8]=2[O:7][C:6]([CH3:38])([CH3:37])[C:5]1=[O:39].[F:40][C:41]([F:47])([F:46])[C:42](=O)[CH2:43][CH3:44].C(N(C(C)C)CC)(C)C.C([BH3-])#N.[Na+].C(=O)([O-])O.[Na+]>C(Cl)Cl.[Ti](Cl)(Cl)(Cl)Cl.CO>[CH3:38][C:6]1([CH3:37])[C:5](=[O:39])[N:4]([CH2:3][CH2:2][NH:1][CH:42]([C:41]([F:47])([F:46])[F:40])[CH2:43][CH3:44])[C:9]2[CH:10]=[C:11]([C:18]([N:20]([CH:34]([CH3:35])[CH3:36])[C@@H:21]3[CH2:26][CH2:25][CH2:24][N:23]([C:27]([O:29][C:30]([CH3:31])([CH3:32])[CH3:33])=[O:28])[CH2:22]3)=[O:19])[C:12]([C:14]([F:15])([F:17])[F:16])=[CH:13][C:8]=2[O:7]1

Participants

9

Reactant 5

HCID 81531DiisopropylethylamineHCID 2382881,1,1-Trifluorobutan-2-oneHCID 516892Sodium BicarbonateHCID 5003444Sodium cyanoborohydrideHCID 58376011tert-butyl (3R)-3-[{[4-(2-aminoethyl)-2,2-dimethyl-3-oxo-7-(trifluoromethyl)-3,4-dihydro-2H-1,4-benzoxazin-6-yl]carbonyl}(isopropyl)amino]piperidine-1-carboxylate

Product 1

HCID 86656360tert-Butyl (3R)-3-[{[2,2-dimethyl-3-oxo-7-(trifluoromethyl)-4-(2-{[1-(trifluoromethyl)propyl]amino}-ethyl)-3,4-dihydro-2H-1,4-benzoxazin-6-yl]carbonyl}(isopropyl)amino]piperidine-1-carboxylate

Reagents, catalysts & solvents 3

HCID 24193Titanium TetrachlorideCatalystHCID 887MethanolSolventHCID 6344DichloromethaneSolvent

Procedure

To a solution of tert-butyl (3R)-3-[{[4-(2-aminoethyl)-2,2-dimethyl-3-oxo-7-(trifluoromethyl)-3,4-dihydro-2H-1,4-benzoxazin-6-yl]carbonyl}(isopropyl)amino]piperidine-1-carboxylate (278 mg) in methylene chloride (2 ml) were added 1,1,1-trifluoro-2-butanone (0.1 ml), diisopropylethylamine (0.34 ml), and titanium tetrachloride (0.05 ml), and the mixture was stirred at room temperature for 3 hours. Then, to the reaction solution were added sodium cyanoborohydride (110 mg) and methanol (10 ml), and the mixture was stirred at room temperature for one hour. To the reaction solution was added a saturated aqueous sodium hydrogen carbonate solution (10 ml), and the mixture was extracted with ethyl acetate. The organic layer was dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate=3:1) to give the title compound (100 mg) as amorphous.

Workup

  1. stirringthe mixture was stirred at room temperature for one hour
  2. extractionthe mixture was extracted with ethyl acetate
  3. dry with materialThe organic layer was dried over magnesium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customThe obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate=3:1)

Sources & evidence

ORD record
ord-2949c7852da243de81dab663d1fcfc30
Source dataset
uspto-grants-2013_03
Patent number
US08389511B2

Reaction notes

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