Ethanol → Nipecotic Acid

Ethanol, 2-(5H-dibenzo[a,d]cyclohepten-5-yloxy)-, as prepared in Part B above (2 g) is dissolved in 40 ml of dry tetrahydrofuran to which triethylamine (1.7 g) is added at once. Methanesulfonyl chloride (0.014 g) is added dropwise and the mixture stirred for 20 min, after which it is filtered and evaporated. Then the methanesulfonate is dissolved in 80 ml of 2-butanone to which ethyl 3-piperidinecarboxylate (1.9 g) is added at once. 3.3 g of K2CO3 are added and the mixture refluxed overnight, then cooled, filtered and evaporated. The remaining oil is chromatographed on dry silica using 70% hexane: 30% ethyl acetate: 2% triethylamine as eluent. 3.4 g (75% yield) of 3-piperidinecarboxylic acid, 1-[2-[5H-dibenzo[a,d]cyclohepten-5-yloxy)ethyl]], ethyl ester is obtained.

1. additionis added at once
2. filtrationafter which it is filtered
3. customevaporated
4. dissolutionThen the methanesulfonate is dissolved in 80 ml of 2-butanone to which ethyl 3-piperidinecarboxylate (1.9 g)
5. additionis added at once
6. addition3.3 g of K2CO3 are added
7. temperaturethe mixture refluxed overnight
8. temperaturecooled
9. filtrationfiltered
10. customevaporated
11. customThe remaining oil is chromatographed on dry silica using 70% hexane

ORD record

ord-a18ca0f755fe4bfda7ccd2c64946cd5c

Source dataset

uspto-grants-1991_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05053521