Methanol → (2S, 4R)-4-hydroxy-N-(4-nitrobenzyloxycarbonyl)proline methyl ester

HRID 2379280Notes

Reaction equation

HRID 2379280 reaction equation
[CH3:1]O.S(Cl)(Cl)=O.[N+:7]([C:10]1[CH:28]=[CH:27][C:13]([CH2:14][O:15][C:16]([N:18]2[CH2:26][C@H:24]([OH:25])[CH2:23][C@H:19]2[C:20]([OH:22])=[O:21])=[O:17])=[CH:12][CH:11]=1)([O-:9])=[O:8]>ClCCl>[OH:25][C@H:24]1[CH2:26][N:18]([C:16]([O:15][CH2:14][C:13]2[CH:27]=[CH:28][C:10]([N+:7]([O-:9])=[O:8])=[CH:11][CH:12]=2)=[O:17])[C@H:19]([C:20]([O:22][CH3:1])=[O:21])[CH2:23]1

Participants

5

Reactant 3

HCID 887MethanolHCID 24386Thionyl ChlorideHCID 10566895trans-4-Hydroxy-1-(4-nitrobenzyloxycarbonyl)-L-proline

Product 1

HCID 18656014(2S, 4R)-4-hydroxy-N-(4-nitrobenzyloxycarbonyl)proline methyl ester

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a mixture of methanol (94.5 ml) and dichloromethane (945 ml) under ice cooling are dropwise added thionyl chloride (18.7 ml) and after 5 minutes stirring N-p-nitrobenzyloxycarbonyl-L-hydroxyproline (1:72.4 g) , and the mixture is stirred overnight at room temperature. The reaction mixture is concentrated in vacuum to give crude (2S,4R)-4-hydroxy-2-methoxycarbonyl-1-p-nitrobenzyloxycarbonylpyrrolidine (86.5 g) as pale yellow oil. This product can be used in the next step without further purification.

Workup

  1. concentrationThe reaction mixture is concentrated in vacuum

Sources & evidence

ORD record
ord-7223f5b7c5854baba67e7ec19cc3ff10
Source dataset
uspto-grants-1994_11
Patent number
US05360798

Reaction notes

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