Undec-4-ene → Ethyl 6-iodo-1,2-dihydro-2-(trifluoromethyl)-3-quinolinecarboxylate

Temperature

60 °C

A mixture of 5-iodo-2-aminobenzaldehyde (24.0 g, 96.7 mmol), diazbicyclo[2.2.2]-undec-7-ene (32.2 g, 212.0 mmol), and ethyl 4,4,4-trifluorocrotonate (35.7 g, 212.0 mmol) in 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone (48 mL) was heated at 60° C. for 8 hours. The solution was cooled to room temperature and the solution poured into ethyl acetate-hexanes (1:1, 500 mL). The solution was extracted with 2.5 N aqueous hydrochloric acid (2×200 mL), saturated aqueous ammonium chloride (2×200 mL), dried over sodium sulfate, filtered and concentrated in vacuo. The resulting dark yellow oil was dissolved in hexanes (100 mL) and fine yellow crystals formed upon standing. Vacuum filtration of this suspension yielded ethyl 6-iodo-1,2-dihydro-2-(trifluoromethyl)-3-quinolinecarboxylate as fine yellow crystals (19.3 g, 50% yield): mp 137–138° C. 1H NMR (CDCl3, 300 MHz) 7.62 (s, 1H), 7.36–7.48 (m, 2H), 6.43 (d, J=8.2 Hz), 5.36 (brs, 1H), 5.11 (q, 1H, J=7.1 Hz), 4.25–4.35 (m, 2H), 1.34 (t, 3H, J=7.0 Hz). ESHRMS m/z 395.9716 (M−H, Calc'd 395.9708).

1. temperatureThe solution was cooled to room temperature
2. extractionThe solution was extracted with 2.5 N aqueous hydrochloric acid (2×200 mL), saturated aqueous ammonium chloride (2×200 mL)
3. dry with materialdried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. dissolutionThe resulting dark yellow oil was dissolved in hexanes (100 mL)
7. customfine yellow crystals formed
8. filtrationVacuum filtration of this suspension

ORD record

ord-6cc513c4043f40f7895748ab1abdf331

Source dataset

uspto-grants-2006_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07138411B2