反应详情

Cyclopentyl bromide (38.7 g, 0.26 mol) is added slowly (over 1 hour) to a stirred suspension of potassium carbonate (41.4 g, 0.3 mol) in N,N-dimethylformamide (200 mL) containing methyl 3-hydroxy-4-nitrobenzoate (39.4 g, 0.2 mol) at 65° C. and then the stirring is continued for 4 hours. The mixture is allowed to cool and then filtered. The filtrate is diluted with water (700 mL) containing sodium chloride (50 g) and then extracted with toluene (3×200 mL). The combined organic extract is washed with 1N sodium hydroxide solution (1×200 mL) and then water (2×200 mL) and then evaporated under reduced pressure to give methyl 3-cyclopentyloxy-4-nitrobenzoate (54.2 g, 100%) as a pale green solid which is used without further purification.

1. temperatureto cool
2. filtrationfiltered
3. additionThe filtrate is diluted with water (700 mL)
4. additioncontaining sodium chloride (50 g)
5. extractionextracted with toluene (3×200 mL)
6. extractionThe combined organic extract
7. washis washed with 1N sodium hydroxide solution (1×200 mL)
8. customwater (2×200 mL) and then evaporated under reduced pressure