反应详情

温度

65 °C

Add sodium hydride (95%, 0.318 g) to a solution of 4-hydroxy-cis-2-methyl-piperidine-1-carboxylic acid tert-butyl ester isomer 2 (preparation 3, 2.465 g) in DMSO (100 mL) and heat in an oil bath at 65° C. After 30 min., add 2,6-dichloropyridine (1.864 g) and beat at 100° C. After 4 hr., partition between ethyl acetate-hexane (1:4) and saturated aqueous NaCl aqueous NaCl, dry over anhydrous sodium sulfate, evaporate and purify on a 35 g silica gel column eluting with ethyl acetate-hexane (1:39) to give the title compound (3.26 g). 1H NMR (CDCl3): 7.50 (t, 1H), 6.87 (d, 1H), 6.61 (d, 1H), 5.38 (m, 1H), 4.35 (m, 1H), 3.89 (m, 1H), 3.22 (m, 1H), 1.93 (m, 3H), 1.75 (m, 1H), 1.46 (s, 9H), 1.26 (d, 3H).

1. custombeat at 100° C
2. waitAfter 4 hr
3. custom, partition between ethyl acetate-hexane (1:4) and saturated aqueous NaCl aqueous NaCl
4. dry with materialdry over anhydrous sodium sulfate
5. customevaporate
6. custompurify on a 35 g silica gel column
7. washeluting with ethyl acetate-hexane (1:39)