反应详情

A solution 14.23 g (110.6 mmol) of 3-fluoro-benzylalcohol and 27.19 g (108.8 mmol) of triphenylphosphine in 150 ml of tetrahydrofurane is added dropwise within 50 min under a nitrogen atmosphere at 0° C. to a solution of 23.65 g (100.5 mmol) of (S)-1-(4-hydroxy-phenyl)-5-oxo-pyrrolidine-3-carboxylic acid methyl ester and 21.62 g (100.5 mmol) of diisopropyl azodicarboxylate in 200 ml of tetrahydrofurane. The mixture is left to warm to RT and stirring is continued for 18 hours. For the working-up, the mixture is evaporated under reduced pressure. The solid residue is triturated in 400 ml of ether to leave a white solid mainly consisting of the product and triphenylphosphinoxide. After filtration, the solid material is triturated in 100 ml of cold methanol to yield 23.5 g (68% of theory) of (S)-1-[4-(3-fluoro-benzyloxy)-phenyl]-5-oxo-pyrrolidine-3-carboxylic acid methyl ester as a white solid [MS: m/e=344 (M+H)+] together with traces of triphenylphosphine and diisopropyl hydrazodicarboxylate.

1. waitThe mixture is left
2. customthe mixture is evaporated under reduced pressure
3. customThe solid residue is triturated in 400 ml of ether
4. customto leave a white solid
5. filtrationAfter filtration
6. customthe solid material is triturated in 100 ml of cold methanol