4-(3-chlorophenyl)butanoic Acid → 6-Chloro-1-tetralone

A mixture of 35.72 of the product from Step B and 50 ml of thionyl chloride was heated at reflux for 2 hours and then stirred at room temperature for 18 hrs. After this time thionyl chloride was removed at reduced pressure and the product was dissolved in carbon tetrachloride and concentrated at reduced pressure. The residue was dissolved in 150 ml of dichloroethane cooled to 0° C. and 28 g of aluminum chloride was added portionwise over about 1 hr in approximately 3 g portions. After stirring for 3 hrs the reaction was poured over a mixture of ice/1N HCl and extracted three times with methylene chloride. The organic extracts were dried over magnesium sulfate and concentrated to approximately 30 g of a brown oil. Chromatography on silica gel with 10% ethyl acetate/hexane afforded 17.83 g of 6-chloro-3,4-dihydro-1(2H)-naphthalenone as a brown oil. 1H NMR was consistent with the structure.

1. temperaturewas heated
2. temperatureat reflux for 2 hours
3. customAfter this time thionyl chloride was removed at reduced pressure
4. dissolutionthe product was dissolved in carbon tetrachloride
5. concentrationconcentrated at reduced pressure
6. dissolutionThe residue was dissolved in 150 ml of dichloroethane
7. temperaturecooled to 0° C.
8. addition28 g of aluminum chloride was added portionwise over about 1 hr in approximately 3 g portions
9. stirringAfter stirring for 3 hrs the reaction
10. additionwas poured over a mixture of ice/1N HCl
11. extractionextracted three times with methylene chloride
12. dry with materialThe organic extracts were dried over magnesium sulfate
13. concentrationconcentrated to approximately 30 g of a brown oil

ORDレコード

ord-6bbf4c448ae94b2893d709237b90e89b

出典データセット

uspto-grants-1990_10

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US04960784