Diisoamyl ketone → (S)-3-(4-Benzyloxy-phenyl)-N-tert-butyl-2-[4-methyl-1-(3-methyl-butyl)-pentylamino]-propionamide monohydrochloride

HRID 430808Notes

Reaction equation

HRID 430808 reaction equation
[ClH:1].[NH2:2][C@@H:3]([CH2:11][C:12]1[CH:17]=[CH:16][C:15]([O:18][CH2:19][C:20]2[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=2)=[CH:14][CH:13]=1)[C:4]([NH:6][C:7]([CH3:10])([CH3:9])[CH3:8])=[O:5].[CH2:26]([C:31]([CH2:33][CH2:34][CH:35]([CH3:37])[CH3:36])=O)[CH2:27][CH:28]([CH3:30])[CH3:29].C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C([O-])(O)=O.[Na+]>C(Cl)Cl>[ClH:1].[CH2:19]([O:18][C:15]1[CH:14]=[CH:13][C:12]([CH2:11][C@H:3]([NH:2][CH:31]([CH2:26][CH2:27][CH:28]([CH3:30])[CH3:29])[CH2:33][CH2:34][CH:35]([CH3:36])[CH3:37])[C:4]([NH:6][C:7]([CH3:8])([CH3:10])[CH3:9])=[O:5])=[CH:17][CH:16]=1)[C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1

Participants

6

Reactant 4

HCID 62421Diisoamyl ketoneHCID 516892Sodium BicarbonateHCID 5049666Sodium triacetoxyborohydrideHCID 69584616(S)-2-Amino-3-(4-benzyloxy-phenyl)-N-tert-butyl-propionamide monohydrochloride

Product 1

HCID 70218218(S)-3-(4-Benzyloxy-phenyl)-N-tert-butyl-2-[4-methyl-1-(3-methyl-butyl)-pentylamino]-propionamide monohydrochlorideYield 30.3%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

(S)-2-Amino-3-(4-benzyloxy-phenyl)-N-tert-butyl-propionamide monohydrochloride (1.04 g, 2.87 mmol, Example 2, Step A) and diisoamyl ketone (0.490 g, 2.87 mmol, Aldrich, Milwaukee, Wis.) were mixed in CH2Cl2 (25 mL). After stirring at ambient temperature under a nitrogen atmosphere for 30 minutes, the solution was cooled to 0° C. in an ice-water bath. To this solution was added sodium triacetoxyborohydride (0.910 g, 4.30 mmol). The resulting reaction mixture was stirred for 30 minutes at 0° C., followed by an additional 12 hours at ambient temperature. Saturated aqueous NaHCO3 solution (25 mL) was added to the reaction mixture, and the resulting mixture was stirred for 5 minutes. The two layers were separated, and the aqueous layer was extracted with CH2Cl2 (2×30 mL). The combined organic solution was dried over Na2SO4. The solution was concentrated in vacuo affording a viscous oil. The crude product was further purified by flash chromatography (25% EtOAc in hexanes). The free amine was dissolved in 10 mL of ethyl ether and treated with ethereal HCl to afford 0.45 g (30%) of the pure titled compound as a white solid; mp 114-115° C.

Workup

  1. temperaturethe solution was cooled to 0° C. in an ice-water bath
  2. customThe resulting reaction mixture
  3. stirringwas stirred for 30 minutes at 0° C.
  4. waitfollowed by an additional 12 hours at ambient temperature
  5. stirringthe resulting mixture was stirred for 5 minutes
  6. customThe two layers were separated
  7. extractionthe aqueous layer was extracted with CH2Cl2 (2×30 mL)
  8. dry with materialThe combined organic solution was dried over Na2SO4
  9. concentrationThe solution was concentrated in vacuo
  10. customaffording a viscous oil
  11. customThe crude product was further purified by flash chromatography (25% EtOAc in hexanes)
  12. dissolutionThe free amine was dissolved in 10 mL of ethyl ether
  13. additiontreated with ethereal HCl

Sources & evidence

ORD record
ord-d6a0d5c5268042e0bb9efd3103209e32
Source dataset
uspto-grants-2001_11
Patent number
US06323243B1

Reaction notes

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