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Dimethylformamide → N-Boc-trans-4-tosyloxy-L-proline methyl ester

HRID 490570
Notes
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Reaction equation

HRID 490570 reaction equation
[CH3:1][O:2][C:3](=[O:17])[C@@H:4]1[CH2:8][C@@H:7]([OH:9])[CH2:6][N:5]1[C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11].[CH3:18][C:19]1[CH:24]=[CH:23][C:22]([S:25](Cl)(=[O:27])=[O:26])=[CH:21][CH:20]=1.CN(C=O)C>N1C=CC=CC=1.C(Cl)Cl>[CH3:1][O:2][C:3]([CH:4]1[CH2:8][CH:7]([O:9][S:25]([C:22]2[CH:23]=[CH:24][C:19]([CH3:18])=[CH:20][CH:21]=2)(=[O:27])=[O:26])[CH2:6][N:5]1[C:10]([O:12][C:13]([CH3:14])([CH3:16])[CH3:15])=[O:11])=[O:17]
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 3

HCID 6228DimethylformamideHCID 73974-Toluenesulfonyl chlorideHCID 2734883(2S,4R)-4-Hydroxypyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester

Product 1

HCID 13425771N-Boc-trans-4-tosyloxy-L-proline methyl ester

Reagents, catalysts & solvents 2

HCID 1049PyridineSolvent
HCID 6344
Dichloromethane
Solvent

Procedure

To a solution of trans-N-Boc-4-hydroxy-L-proline methyl ester (7) in pyridine and dry DCM at 0° C. is added 4-methyl-benzenesulfonyl chloride. After adding, the mixture is refluxed overnight. The solvent is evaporated and then the residue is dissolved in CH2Cl2. After removal of solvent, the crude 4-(toluene-4-sulfonyloxy)-pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester is obtained, which is used in the following reaction without further purification. To a solution of 4-(toluene-4-sulfonyloxy)-pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester thus obtained above in dry DMF is added NaN3 in one portion, and the reaction mixture is stirred at about 50° C. for 5 h. The resulting mixture is purified to give 4-azido-pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester (8).

Workup

  1. additionAfter adding
  2. temperaturethe mixture is refluxed overnight
  3. customThe solvent is evaporated
  4. dissolutionthe residue is dissolved in CH2Cl2
  5. customAfter removal of solvent
  6. customthe crude 4-(toluene-4-sulfonyloxy)-pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester is obtained
  7. customwhich is used in the following reaction without further purification

Sources & evidence

ORD record
ord-9c15454bdc8c42888c4c4ab6537db2ab
Source dataset
uspto-grants-2009_05
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US07528136B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes