Dimethylformamide → 1,3-Dibenzyl (3RS,4SR)-3-[2-(tert-butoxy)-2-oxoethyl]-4-methylpyrrolidine-1,3-dicarboxylate

HRID 446034Notes

Reaction equation

HRID 446034 reaction equation
[CH2:1](Br)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH2:9]([O:16][C:17]([N:19]1[CH2:23][CH:22]([CH3:24])[C:21]([CH2:28][C:29]([O:31][C:32]([CH3:35])([CH3:34])[CH3:33])=[O:30])([C:25]([OH:27])=[O:26])[CH2:20]1)=[O:18])[C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1.C(=O)([O-])[O-].[K+].[K+].CN(C)C=O>O>[C:32]([O:31][C:29](=[O:30])[CH2:28][C:21]1([C:25]([O:27][CH2:1][C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=2)=[O:26])[CH:22]([CH3:24])[CH2:23][N:19]([C:17]([O:16][CH2:9][C:10]2[CH:11]=[CH:12][CH:13]=[CH:14][CH:15]=2)=[O:18])[CH2:20]1)([CH3:34])([CH3:33])[CH3:35]

Participants

6

Reactant 4

HCID 6228DimethylformamideHCID 7498Benzyl BromideHCID 11430Potassium CarbonateHCID 71293735(3RS,4SR)-1-[(Benzyloxy)carbonyl]-3-[2-(tert-butoxy)-2-oxoethyl]-4-methylpyrrolidine-3-carboxylic acid

Product 1

HCID 866782511,3-Dibenzyl (3RS,4SR)-3-[2-(tert-butoxy)-2-oxoethyl]-4-methylpyrrolidine-1,3-dicarboxylateYield 98.2%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Conditions

Temperature
5 °C

Procedure

Benzyl bromide (4.48 ml, 37.7 mmol) was added to a mixture of (3RS,4SR)-1-[(benzyloxy)carbonyl]-3-[2-(tert-butoxy)-2-oxoethyl]-4-methylpyrrolidine-3-carboxylic acid obtained in Reference Example 1b (14.5 g, 38.5 mmol), potassium carbonate (10.6 g, 77 mmol) and N,N-dimethylformamide (50 ml) with stirring under ice-cooling (internal temperature: 3 to 7° C.), and the mixture was stirred for one hour, returned to mom temperature and stirred overnight. Water was added to the reaction liquid, which was extracted with ethyl acetate three times. The organic layers were combined, sequentially washed with a saturated aqueous ammonium chloride solution (five times), water (twice) and brine, and then dried over sodium sulfate, filtered and concentrated to give the title compound (17.67 g, yield: 98.2%).

Workup

  1. stirringthe mixture was stirred for one hour
  2. stirringstirred overnight
  3. extractionwas extracted with ethyl acetate three times
  4. washsequentially washed with a saturated aqueous ammonium chloride solution (five times), water (twice) and brine
  5. dry with materialdried over sodium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated

Sources & evidence

ORD record
ord-d09bee670b6d48cfb1eafed9b9e09818
Source dataset
uspto-grants-2013_07
Patent number
US08476301B2

Reaction notes

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