反应详情

A solution of 5-(biphenyl-4-yloxymethyl)-furan-2-carboxylic acid (of Intermediate 8; 0.098 g, 0.33 mmol), ethyl pipecolinate (Aldrich; 0.139 g, 0.88 mmol), 1-ethyl-3-(3-dimethylaminopropyl) hydrochloride (Avocado; 0.13 g, 0.68 mmol), and N,N-dimethylaminopyridine (0.083 g, 0.68 mmol) in tetrahydrofuran (10 mL) was stirred at room temperature for 16 h. The solvents were evaporated under reduced pressure, and water and ethyl acetate were added. The aqueous phase was extracted three times with ethyl acetate, and the combined organic layers were dried (sodium sulfate), filtered, evaporated, and purified using a Biotage Flash 40 purification system, eluting with methylene chloride/acetone 9:1, to give (rac)-1-[5-(biphenyl-4-yloxymethyl)-furan-2-carbonyl]-piperidine-2-carboxylic acid ethyl ester as a colorless oil (0.085 g, 59%).

1. customThe solvents were evaporated under reduced pressure, and water and ethyl acetate
2. additionwere added
3. extractionThe aqueous phase was extracted three times with ethyl acetate
4. dry with materialthe combined organic layers were dried (sodium sulfate)
5. filtrationfiltered
6. customevaporated
7. custompurified
8. customa Biotage Flash 40 purification system
9. washeluting with methylene chloride/acetone 9:1