反应详情

A solution of dimethyl 2,3-dihydro-5-(3,4-dichlorophenyl)-1H-pyrrolizine-6,7-dicarboxylate (57.8 g, 0.157 mol) in dry dichloromethane (250 mL) was added dropwise, over a 30-min period, to a mechanically stirred mixture of lithium aluminum hydride (14.04 g, 2.35 equiv) in anhydrous ether (400 ml) heated under reflux. The stirred mixture was heated at reflux for 1 h after the addition was completed and cooled in an ice bath. The excess hydride was decomposed with wet ether and then with water until the salts were white. The mixture was filtered (through sintered glass) and the inorganic residue was washed with several portions (ca. 100 mL) of hot dichloromethane until the total filtrate volume was 1.2 L. The filtrate was concentrated in vacuo to a volume of 500 mL, warmed to boiling, and diluted with slow addition of 350 mL of petroleum ether. Compound 2,3-Dihydro-5-(3',4'-dichlorophenyl)-6,7-bis(hydroxy-methyl)-1H-pyrrolizine precipitated as clear, white, chunky prisms (33.8 g); the concentrated mother liquor, after similar treatment, gave an additional 9.71 g of 2,3-dihydro-5-(3',4'-dichlorophenyl)-6,7-bis(hydroxymethyl)-1H-pyrrolizine to a total yield of 89%.

1. temperatureheated
2. temperatureunder reflux
3. temperatureThe stirred mixture was heated
4. temperatureat reflux for 1 h
5. additionafter the addition
6. temperaturecooled in an ice bath
7. filtrationThe mixture was filtered (through sintered glass)
8. washthe inorganic residue was washed with several portions (ca. 100 mL) of hot dichloromethane until the total filtrate volume
9. concentrationThe filtrate was concentrated in vacuo to a volume of 500 mL
10. temperaturewarmed
11. additiondiluted with slow addition of 350 mL of petroleum ether
12. customCompound 2,3-Dihydro-5-(3',4'-dichlorophenyl)-6,7-bis(hydroxy-methyl)-1H-pyrrolizine precipitated as clear, white, chunky prisms (33.8 g)