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 ad 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 using70% 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 using70% hexane

ORD record

ord-e83fc223865549909143d0989bc38281

Source dataset

uspto-grants-1990_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04910312