反应详情

Di-iso-butylaluminum hydride (54 ml., 25% solution in toluene) is added with stirring to a solution of 5.1 g. of 4-(15-carboxypentadecylamino)benzonitrile under a nitrogen atmosphere. The temperature rises to 40° C. during the addition which takes 30 minutes and the reaction is then stirred for 1 hour. A solution of methanol in toluene (50 ml., 1:1) is added over 30 minutes and the mixture is poured into vigorously stirred ice-cold aqueous sulfuric acid (500 ml., 5%). After 10 minutes diatomaceous earth (30 g.) is added, the mixture filtered and the organic layer separated. The aqueous solution is extracted twice with toluene (100 ml.) and the combined organic layers are washed with aqueous sodium bicarbonate, dried over magnesium sulfate, decolorized with charcoal, filtered and evaporated in vacuo to give a light yellow crystalline solid. Recrystallization from hexane affords 4-(15-carboxypentadecylamino)benzaldehyde as a white solid.

1. additionThe temperature rises to 40° C. during the addition which
2. stirringthe reaction is then stirred for 1 hour
3. additionAfter 10 minutes diatomaceous earth (30 g.) is added
4. filtrationthe mixture filtered
5. customthe organic layer separated
6. extractionThe aqueous solution is extracted twice with toluene (100 ml.)
7. washthe combined organic layers are washed with aqueous sodium bicarbonate
8. dry with materialdried over magnesium sulfate
9. filtrationfiltered
10. customevaporated in vacuo
11. customto give a light yellow crystalline solid
12. customRecrystallization from hexane