反应详情

温度

0 °C

1,2,3,4-tetrahydro-2-methyl-6-nitrobenzofuro[3,2-c]pyridine (0.0224 mol), prepared according to the procedure described in J. Chem. Soc. (C), 1971, p53-60, was dissolved in 1,2-dichloroethane (40 ml), and cooled to 0° C. At this temperature, (1-chloroethyl) acetylchloride (0.0291 mol) was added dropwise. The suspension was stirred and refluxed for 2 hours. 1,2-dichloroethane was evaporated. The mixture was dissolved in methanol, stirred and refluxed for 2 hours, then filtered. Both the filtrate and crystals were treated with 2 N Na2CO3 and this mixture was extracted with CH2Cl2. The separated organic layer was dried, filtered, and the solvent evaporated. The residue was purified by column chromatography over silica gel (eluent: CH2Cl2 /CH3OH 90/10). The desired fractions were collected and the solvent was evaporated, yielding 1.5 g 1,2,3,4-tetrahydro-6-nitrobenzofuro[3,2-c]-pyridine (intern. 4).

1. temperaturerefluxed for 2 hours
2. custom1,2-dichloroethane was evaporated
3. dissolutionThe mixture was dissolved in methanol
4. stirringstirred
5. temperaturerefluxed for 2 hours
6. filtrationfiltered
7. additionBoth the filtrate and crystals were treated with 2 N Na2CO3
8. extractionthis mixture was extracted with CH2Cl2
9. customThe separated organic layer was dried
10. filtrationfiltered
11. customthe solvent evaporated
12. customThe residue was purified by column chromatography over silica gel (eluent: CH2Cl2 /CH3OH 90/10)
13. customThe desired fractions were collected
14. customthe solvent was evaporated