反应详情

Titanium (IV) chloride (0.098 ml, 0.887 mmol) was added to a solution of N-cyclopropyl-6-(1,2,3,6-tetrahydropyridin-4-yl)picolinamide free base (5b) (432 mg, 1.77 mmol), 2,2,2-trifluoro-1-(4-trifluoromethoxyphenyl)ethanone (63) (458 mg, 1.77 mmol) and triethylamine (0.492 ml, 3.55 mmol) in CH2Cl2 (12 ml) and stirred at room temperature for 18 hours. Sodium cyanoborohydride (334 mg, 5.32 mmol) in methanol (4 ml) was added to the reaction mixture and stirred for 19 hours. The reaction was quenched with aqueous NaOH solution (2 N), extracted with CH2Cl2, dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography (ethyl acetate/hexane: 67/33) to give 1′-[2,2,2-trifluoro-1-(4-trifluoromethoxyphenyl)ethyl]-1′,2′,3′,6′-tetrahydro-[2,4′]bipyridinyl-6-carboxylic acid cyclopropylamide (64) (226 mg, yield 26%) as a pale orange oil. 1H NMR (400 MHz, CDCl1): S 8.04 (m, 1H), 8.00 (brs, 1H), 7.77 (t, J=7.8 Hz, 1H), 7.47 (m, 3H), 7.26 (m, 2H), 6.58 (m, 1H), 4.21 (q, J=7.9 Hz, 1H), 3.45 (m, 2H), 2.97 (m, 1H), 2.90 (m, 1H), 2.80 (m, 1H), 2.66 (m, 2H), 0.88 (m, 2H), 0.65 (m, 2H); MS: 486 (M+H+).

1. stirringstirred for 19 hours
2. customThe reaction was quenched with aqueous NaOH solution (2 N)
3. extractionextracted with CH2Cl2
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe residue was purified by column chromatography (ethyl acetate/hexane: 67/33)