反应详情

To a suspension of 0.15 moles of lithium aluminum hydride in 250 ml. of ether is added dropwise with stirring a solution of 0.05 moles of dimethyl 2-methyl-3-hydroxy-6-vinylpyridine, 4,5-dicarboxylate in 150 ml. of ether. The mixture is refluxed for 6 hours and stirred overnight at room temperature. The reaction mixture is cooled and 100 ml. of water added dropwise with stirring. The resulting mixture is saturated with carbon dioxide for 30 minutes and then filtered. The precipitate is stirred with 250 ml. of ethanol-water (1:1) and saturated again with carbon dioxide and filtered. The solid is then extracted twice with 100 ml. of boiling ethanol. The combined filtrates are evaporated to dryness in vacuo. The residue is extracted 5 times with 100 ml. of boiling ethanol. The combined extracts are filtered and evaporated to dryness to give 2-methyl-3-hydroxy-4,5-di(hydroxymethyl)-6-vinylpyridine.

1. temperatureThe mixture is refluxed for 6 hours
2. temperatureThe reaction mixture is cooled
3. stirringwith stirring
4. filtrationfiltered
5. stirringThe precipitate is stirred with 250 ml
6. filtrationof ethanol-water (1:1) and saturated again with carbon dioxide and filtered
7. extractionThe solid is then extracted twice with 100 ml
8. customThe combined filtrates are evaporated to dryness in vacuo
9. extractionThe residue is extracted 5 times with 100 ml
10. filtrationThe combined extracts are filtered
11. customevaporated to dryness