反应详情

A mixture of 54 g (0.25 mole) of 5-(4-nitrophenyl)-2-furaldehyde and 30.5 g (0.25 mole) of 2-(2-aminoethyl)pyridine in 300 ml of methanol was heated under reflux for 21/2 hours. The resulting solution was cooled to 25°, and 9.5 g (0.25 mole) of sodium borohydride was added in portions over 1 hour at 25°-30°. The solution was heated under reflux for 15 min, and the solvent was removed on a rotary evaporator. The residual solid was partitioned between water and chloroform. The chloroform layer (400 ml) was separated, dried over MgSO4, and concentrated on a rotary evaporator to give 81 g of a reddish brown, oily residue which solidified on standing. The residual solid was dissolved in 400 ml of absolute methanol and treated with 200 ml of absolute methanol saturated with hydrogen chloride with cooling in ice. The yellow solid which was deposited was collected by filtration using a rubber dam and dried in a vacuum oven at oil pump pressure at 100° C. for 8 hr to give 86 g (87%) of product. Two additional recrystallizations from absolute methanol gave an analytical sample, m.p. 173°-177°.

1. temperaturewas heated
2. temperatureunder reflux for 21/2 hours
3. temperatureThe resulting solution was cooled to 25°
4. temperatureThe solution was heated
5. temperatureunder reflux for 15 min
6. customthe solvent was removed on a rotary evaporator
7. customThe residual solid was partitioned between water and chloroform
8. customThe chloroform layer (400 ml) was separated
9. dry with materialdried over MgSO4
10. concentrationconcentrated on a rotary evaporator
11. customto give 81 g of a reddish brown, oily residue which
12. temperaturewith cooling in ice
13. filtrationThe yellow solid which was deposited was collected by filtration
14. customdried in a vacuum oven at oil pump pressure at 100° C. for 8 hr