1,2-Dichloroethane → Ethyl 3-(tert-butoxycarbonylamino)-2-hydroxy-4-phenylbutanoate

HRID 2061689Notes

Reaction equation

HRID 2061689 reaction equation
[CH:1]1C=CC2N(O)N=NC=2[CH:6]=1.CCN(CC)CC.[C:18]([O:22][C:23]([NH:25][CH:26]([CH2:32][C:33]1[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=1)[CH:27]([OH:31])[C:28]([OH:30])=[O:29])=[O:24])([CH3:21])([CH3:20])[CH3:19].C1(N)CC1.C(Cl)CCl>C(Cl)Cl>[C:18]([O:22][C:23]([NH:25][CH:26]([CH2:32][C:33]1[CH:34]=[CH:35][CH:36]=[CH:37][CH:38]=1)[CH:27]([OH:31])[C:28]([O:30][CH2:1][CH3:6])=[O:29])=[O:24])([CH3:21])([CH3:19])[CH3:20]

Participants

7

Reactant 5

HCID 111,2-DichloroethaneHCID 8471Triethylamine2×HCID 69828Cyclopropylamine2×HCID 757711-Hydroxybenzotriazole2×HCID 34203793-tert-Butoxycarbonylamino-2-hydroxy-4-phenylbutyric acid

Product 1

HCID 67095085Ethyl 3-(tert-butoxycarbonylamino)-2-hydroxy-4-phenylbutanoateYield 87.9%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

74.2 Tert-butyl 4-(cyclopropylamino)-3-hydroxy-4-oxo-1-phenylbutan-2-ylcarbamate EDC (8.3 g, 43.3 mmol), HOBT (6.6 g, 43.1 mmol) and Et3N (7 ml, 50.2 mmol) were added to a mixture of 3-(tert-butoxycarbonylamino)-2-hydroxy-4-phenylbutanoic acid (10.6 g, 35.9 mmol) and cyclopropylamine (3.3 ml, 47.6 mmol) in DCM (300 mL) at 5° C. The reaction mixture was allowed to warm to room temperature and stirred overnight. After cooling to 5° C. more cyclopropylamine (2 ml, 28.5 mmol), EDC (5 g, 26.1 mmol), HOBT (4 g, 26.1 mmol) and Et3N (3.5 ml, 25.1 mmol) were added, the mixture was allowed to warm to room temperature and the stirring was continued overnight. DCM (300 mL) was added, followed by washing with 0.5 M aqueous HCl solution, brine and drying with MgSO4. The crude product was recrystallized from methyl-tert-butylether, the crystals obtained were washed with n-pentane and dried providing the title compound (10.2 g, 85%).

Workup

  1. additionwere added
  2. temperatureto warm to room temperature
  3. waitthe stirring was continued overnight
  4. washby washing with 0.5 M aqueous HCl solution, brine
  5. dry with materialdrying with MgSO4
  6. customThe crude product was recrystallized from methyl-tert-butylether
  7. customthe crystals obtained
  8. washwere washed with n-pentane
  9. customdried

Sources & evidence

ORD record
ord-2fa4269bd36d404f833bffa988022e76
Source dataset
uspto-grants-2012_10
Patent number
US08283363B2

Reaction notes

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