Ethyl Acetate → HCID 67461624, compound

HRID 553972Notes

Reaction equation

HRID 553972 reaction equation
[CH3:1][CH2:2][O:3][C:4]([C@H:6]1[CH2:10][CH2:9][C:8](=[O:11])[N:7]1[C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13])=[O:5].[F:19][C:20]1[CH:25]=[C:24]([F:26])[CH:23]=[C:22]([F:27])[C:21]=1[Mg]Br.[Cl-].[NH4+].C(OCC)(=O)C>O1CCCC1>[C:15]([O:14][C:12]([NH:7][C@H:6]([CH2:10][CH2:9][C:8](=[O:11])[C:21]1[C:20]([F:19])=[CH:25][C:24]([F:26])=[CH:23][C:22]=1[F:27])[C:4]([O:3][CH2:2][CH3:1])=[O:5])=[O:13])([CH3:18])([CH3:17])[CH3:16]

Participants

6

Reactant 4

HCID 8857Ethyl AcetateHCID 25517Ammonium ChlorideHCID 8208851-Boc-D-Pyroglutamic acid ethyl esterHCID 178505934HCID 178505934, compound

Product 1

HCID 67461624HCID 67461624, compound

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
-40 °C

Procedure

To a solution of (R)-5-oxopyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-ethyl ester (CAS No. 128811-48-3; 5.7 g) in tetrahydrofuran (30 mL), 2,4,6-trifluorophenylmagnesium bromide (0.24 M solution in THF; 100 mL) was added dropwise at −40° C. over one hour, and the reaction solution was stirred at −40° C. for 12 hours. Saturated aqueous ammonium chloride and ethyl acetate were added to the solution. The reaction solution was heated to room temperature, and the organic layer was separated. The resulting organic layer was washed with brine, dried over anhydrous magnesium sulfate, and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (heptane->heptane:ethyl acetate=1:1) to obtain 6.2 g of ethyl (R)-2-tert-butoxycarbonylamino-5-oxo-5-(2,4,6-trifluorophenyl)pentanoate. A solution of 4 N hydrochloric acid in ethyl acetate (30 mL) was added to a solution of the resulting ethyl (R)-2-tert-butoxycarbonylamino-5-oxo-5-(2,4,6-trifluorophenyl)pentanoate in ethyl acetate (30 mL), and the solution was stirred for 12 hours. The reaction solution was concentrated under reduced pressure. Ethyl acetate and saturated sodium bicarbonate water were added to the residue, and the organic layer was separated. The resulting organic layer was dried over anhydrous magnesium sulfate and then concentrated under reduced pressure. 10% palladium-carbon (100 mg) was added to a solution of the residue in ethyl acetate (20 mL) and ethanol (10 mL), and the reaction solution was stirred in a hydrogen atmosphere at 1 atm for 21 hours. The reaction solution was filtered through celite, and the filtrate was concentrated under reduced pressure to obtain 4.34 g of the title compound. The property value of the compound is as follows.

Workup

  1. temperatureThe reaction solution was heated to room temperature
  2. customthe organic layer was separated
  3. washThe resulting organic layer was washed with brine
  4. dry with materialdried over anhydrous magnesium sulfate
  5. concentrationconcentrated under reduced pressure
  6. customThe residue was purified by silica gel column chromatography (heptane->heptane:ethyl acetate=1:1)

Sources & evidence

ORD record
ord-188fe29529484190b468110b7669f969
Source dataset
uspto-grants-2011_11
Patent number
US08048878B2

Reaction notes

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