反应详情

A stirred mixture of 2,3-dichloro-4-(6-bromohexanoyl)anisole (10 g.), dimethylamine hydrochloride (4 g.), paraformaldehyde (2 g.) and acetic acid (0.5 ml.) is heated on a steam bath for 2 hours, treated with DMF (30 ml.)' and heated an additional 2.5 hours. The reaction mixture is poured into water, extracted with ether, washed with water and dried over magnesium sulfate. Evaporation of the ether affords 9 g. of crude 2,3-dichloro-4-(6-chloro-2-methylenehexanoyl)anisole which is cyclialkylated by treatment with concentrated sulfuric acid (50 ml.). The sulfuric acid solution is poured into water (300 ml.) affording 5.8 g. of 2-(4-chlorobutyl)-5-methoxy-6,7-dichloro-1-indanone which melts at 92° C. after recrystallization from cyclohexane.

1. temperatureis heated on a steam bath for 2 hours
2. temperatureheated an additional 2.5 hours
3. extractionextracted with ether
4. washwashed with water
5. dry with materialdried over magnesium sulfate
6. customEvaporation of the ether
7. customaffords 9 g
8. customaffording 5.8 g
9. customof 2-(4-chlorobutyl)-5-methoxy-6,7-dichloro-1-indanone which melts at 92° C. after recrystallization from cyclohexane