Triethylamine → Methyl 1-(6-methoxy-3-(trifluoromethyl)quinolin-2-yl)piperidine-4-carboxylate

To a solution of 2-chloro-6-methoxy-3-(trifluoromethyl)quinoline (1.00 g, 3.85 mmol) (see Intermediate 6, Step 8 for synthesis) in IPA (5 mL) was added methyl-4-piperidinecarboxylate (5.50 g, 38.5 mmol) and Et3N (1.17 g, 11.6 mmol). The mixture was heated to reflux for 48 hours. The mixture was diluted with water (100 mL) and extracted with DCM (100 mL×3), the combined organic layers were washed with brine (200 mL), dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure to give the crude product, which was purified by column chromatography on silica gel (PE/EtOAc=15/1) to give the product (600 mg, yield 43%) as a solid.

1. temperatureThe mixture was heated
2. temperatureto reflux for 48 hours
3. extractionextracted with DCM (100 mL×3)
4. washthe combined organic layers were washed with brine (200 mL)
5. dry with materialdried over anhydrous Na2SO4
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customto give the crude product, which
9. customwas purified by column chromatography on silica gel (PE/EtOAc=15/1)

ORD record

ord-91f426121a724ce7aa13b19804805233

Source dataset

uspto-grants-2016_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09433618B2