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

Participants

Reaction Steps

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.

Provenance & Evidence