4-(Tert-butoxy)-4-oxobutanoic acid → (R)-tert-butyl 4-(1-(4-bromophenyl)-4-ethoxy-4-oxobutan-2-ylamino)-4-oxobutanoate

HRID 70887Notes

Reaction equation

HRID 70887 reaction equation
[C:1]([O:5][C:6](=[O:12])[CH2:7][CH2:8][C:9]([OH:11])=O)([CH3:4])([CH3:3])[CH3:2].Cl.[NH2:14][C@H:15]([CH2:22][C:23]1[CH:28]=[CH:27][C:26]([Br:29])=[CH:25][CH:24]=1)[CH2:16][C:17]([O:19][CH2:20][CH3:21])=[O:18].CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F>CN(C=O)C.C(Cl)Cl>[Br:29][C:26]1[CH:25]=[CH:24][C:23]([CH2:22][C@@H:15]([NH:14][C:9](=[O:11])[CH2:8][CH2:7][C:6]([O:5][C:1]([CH3:2])([CH3:3])[CH3:4])=[O:12])[CH2:16][C:17]([O:19][CH2:20][CH3:21])=[O:18])=[CH:28][CH:27]=1

Participants

6

Reactant 3

HCID 41391074-(Tert-butoxy)-4-oxobutanoic acidHCID 9886157Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 86648197(R)-ethyl 3-amino-4-(4-bromophenyl)butanoate hydrochloride

Product 1

HCID 59607774(R)-tert-butyl 4-(1-(4-bromophenyl)-4-ethoxy-4-oxobutan-2-ylamino)-4-oxobutanoateYield 72.9%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 6344DichloromethaneSolvent

Procedure

To a solution of 4-tert-butoxy-4-oxobutanoic acid (2.38 g, 13.64 mmol) in DMF (30 mL) and DCM (30 mL) is added (R)-ethyl 3-amino-4-(4-bromophenyl)butanoate hydrochloride (4 g, 12.4 mmol), HATU (5.19 g, 13.64 mmol), and TEA (6.91 mL, 49.6 mmol). After stirring at room temperature for 2 hours, the reaction is quenched with H2O, and the crude is diluted with EtOAc, the organic layer is washed with brine, dried over Na2SO4, filtered, and concentrated under reduced pressure to give (R)-tert-butyl 4-(1-(4-bromophenyl)-4-ethoxy-4-oxobutan-2-ylamino)-4-oxobutanoate (4.0 g). HPLC retention time=1.70 minutes (condition A); MS (m+1)=444.1.

Workup

  1. customthe reaction is quenched with H2O
  2. additionthe crude is diluted with EtOAc
  3. washthe organic layer is washed with brine
  4. dry with materialdried over Na2SO4
  5. filtrationfiltered
  6. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-36ffbe92d6ea421e9aae20e1ecdec18c
Source dataset
uspto-grants-2014_09
Patent number
US08822534B2

Reaction notes

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