Water → (S)-methyl 6-bromo-2-methyl-5-propoxy-3,4-dihydroquinoline-1 (2H)-carboxylate

Temperatur

100 °C

A mixture of (S)-methyl 6-bromo-5-hydroxy-2-methyl-3,4-dihydroquinoline-1(2H)-carboxylate (0.110 g, 0.366 mmol), 1-bromopropane (0.166 mL, 1.832 mmol), and potassium tert-butoxide (0.103 g, 0.916 mmol) in DMF (3.0 mL) was heated in a sealed tube at 100° C. After 24 h, additional 1-bromopropane (0.166 mL, 1.832 mmol) and potassium tert-butoxide (0.103 g, 0.916 mmol) were added and the mixture was heated in a sealed tube at 100° C. for 24 h. The reaction mixture was cooled to rt and water was added. The mixture was extracted with dichloromethane and the combined organic phases were washed with water and brine, dried over anhydrous sodium sulfate, filtered, and concentrated to afford a yellow oil. This material was purified via column chromatography on silica gel (Biotage 25 g column, gradient elution with 0-25% ethyl acetate-hexane) to afford (S)-methyl 6-bromo-2-methyl-5-propoxy-3,4-dihydroquinoline-1 (2H)-carboxylate (0.120 g, 96%) as a colorless oil. MS (ESI, pos. ion) m/z 342, 344 [M+H]+.

1. temperaturethe mixture was heated in a sealed tube at 100° C. for 24 h
2. temperatureThe reaction mixture was cooled to rt
3. extractionThe mixture was extracted with dichloromethane
4. washthe combined organic phases were washed with water and brine
5. dry with materialdried over anhydrous sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated
8. customto afford a yellow oil
9. customThis material was purified via column chromatography on silica gel (Biotage 25 g column, gradient elution with 0-25% ethyl acetate-hexane)

ORD-Eintrag

ord-1985c980ab9c4018ba70279c6fe04b6f

Quelldatensatz

uspto-grants-2016_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09388161B2