Ammonia → HCID 66756556, compound

HRID 475346Notes

Reaction equation

HRID 475346 reaction equation
[C:1]([O:5][C:6]([NH:8][C@H:9]([C:14]([N:16]1[C@@H:23]([CH2:24][CH3:25])[CH2:22][CH2:21][C@H:17]1[C:18](O)=[O:19])=[O:15])[CH2:10][CH:11]([CH3:13])[CH3:12])=[O:7])([CH3:4])([CH3:3])[CH3:2].C([N:28](CC)CC)C.ClC(OCC)=O.N>C1COCC1.O1CCOCC1>[C:1]([O:5][C:6]([NH:8][C@H:9]([C:14]([N:16]1[C@@H:23]([CH2:24][CH3:25])[CH2:22][CH2:21][C@H:17]1[C:18]([NH2:28])=[O:19])=[O:15])[CH2:10][CH:11]([CH3:13])[CH3:12])=[O:7])([CH3:3])([CH3:2])[CH3:4]

Participants

7

Reactant 4

HCID 222AmmoniaHCID 8471TriethylamineHCID 10928Ethyl chloroformateHCID 66756932HCID 66756932, compound

Product 1

HCID 66756556HCID 66756556, compound

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
0 °C

Procedure

N-(tert-butoxycarbonyl)-L-leucyl-(5S)-5-ethyl-L-proline was mixed with triethylamine (0.426 mL, 3.25 mmol) in THF (4 mL) and cooled to 0° C. followed by the addition of ethyl chloroformate (0.287 mL, 3.0 mmol). After 20 minutes, 0.5 M ammonia in dioxane (6 mL) was added. After 4 hours, the mixture was concentrated, and the residue was partitioned between 1 N HCl and ethyl acetate. The organic extracts were washed with saturated NaHCO3, dried (Na2SO4), filtered, concentrated under reduced pressure and purified by flash chromatography (80% to 100% ethyl acetate/hexane) to provide the titled compound. MS (ESI) m/z 356 (M+H)+.

Workup

  1. waitAfter 4 hours
  2. concentrationthe mixture was concentrated
  3. customthe residue was partitioned between 1 N HCl and ethyl acetate
  4. washThe organic extracts were washed with saturated NaHCO3
  5. dry with materialdried (Na2SO4)
  6. filtrationfiltered
  7. concentrationconcentrated under reduced pressure
  8. custompurified by flash chromatography (80% to 100% ethyl acetate/hexane)

Sources & evidence

ORD record
ord-ee4a0cda134f4cf5bbb1b934423f314c
Source dataset
uspto-grants-2014_01
Patent number
US08637546B2

Reaction notes

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