Sodium Carbonate → (S)-Methyl 2-(((benzyloxy)carbonyl)amino)-4-methylpentanoate

HRID 610432Notes

Reaction equation

HRID 610432 reaction equation
[CH3:1][O:2][C:3](=[O:10])[C@H:4]([CH2:6][CH:7]([CH3:9])[CH3:8])[NH2:5].C([O-])([O-])=O.[Na+].[Na+].[CH2:17]([O:24][C:25](Cl)=[O:26])[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1>O1CCOCC1>[CH3:1][O:2][C:3](=[O:10])[C@H:4]([CH2:6][CH:7]([CH3:9])[CH3:8])[NH:5][C:25]([O:24][CH2:17][C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1)=[O:26]

Participants

5

Reactant 3

HCID 10340Sodium CarbonateHCID 10387Benzyl chloroformateHCID 65105(+)-L-Leucine methyl ester

Product 1

HCID 2063832(S)-Methyl 2-(((benzyloxy)carbonyl)amino)-4-methylpentanoateYield 100.9%

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Procedure

To a stirring solution of L-leucine methyl ester (2.0 g, 11.0 mmol) in 1,4-dioxane (20 mL) was added aqueous Na2CO3 solution (12.1 mL, 2M in H2O) followed by benzylchloroformate (1.96 g, 11.5 mmol). The mixture stirred at room temperature for 4 h then partitioned between ethyl acetate and water. The organic layer was washed with saturated brine, dried (MgSO4), filtered and concentrated to yield the title compound as a colorless oil (3.1 g, 100%). 1HNMR (400 MHz, CDCl3) δ7.34 (m, 5H), 5.27 (d, 1H), 5.12 (s, 2H), 4.41 (s, 2H), 3.75 (s, 3H), 1.65 (m, 3H), 0.96 (m, 6H).

Workup

  1. customthen partitioned between ethyl acetate and water
  2. washThe organic layer was washed with saturated brine
  3. dry with materialdried (MgSO4)
  4. filtrationfiltered
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-61fbf2853fce4862be8e2d6636a4daa1
Source dataset
uspto-grants-1999_12
Patent number
US05998470

Reaction notes

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