反应详情

A mixture of 20 grams (0.142 mole) of (6-chloro-3-pyridyl)formaldehyde and 31.3 grams (0.284 mole) of magnesium sulfate in 800 mL of 1,2-dichloroethane was stirred and 13.0 grams (0.213 mole) of 2-aminoethan-1-ol was added. Upon completion of addition, the reaction mixture was stirred for six hours, and 45.1 grams (0.213 mole) of sodium triacetoxyborohydride was added. Following the addition, the reaction mixture was stirred for about 72 hours, and then it was diluted with 250 mL of an aqueous solution comprised of 125 mL of an aqueous solution saturated with sodium chloride and 125 mL of water. The organic layer was separated and the aqueous layer was washed with ten 100 mL portions of 25% isopropanol in methylene chloride. The combined washes were dried with sodium sulfate and concentrated under reduced pressure to a residue. The residue was purified with column chromatography on silica gel. Elution was accomplished using mixtures of 5% methanol and 20% methanol in methylene chloride as eluants. The appropriate fractions were combined and concentrated under reduced pressure, yielding 9.8 grams of the subject compound. The NMR spectrum was consistent with the proposed structure.

1. additionUpon completion of addition
2. stirringthe reaction mixture was stirred for six hours
3. additionthe addition
4. stirringthe reaction mixture was stirred for about 72 hours
5. customThe organic layer was separated
6. washthe aqueous layer was washed with ten 100 mL portions of 25% isopropanol in methylene chloride
7. dry with materialThe combined washes were dried with sodium sulfate
8. concentrationconcentrated under reduced pressure to a residue
9. customThe residue was purified with column chromatography on silica gel
10. washElution
11. concentrationconcentrated under reduced pressure