反应详情

温度

70 °C

To a solution of 2-hydroxy-3-methoxyphenylacetonitrile (1 g, 6.1 mmol) in DMF (12 mL) was added 1,1-dimethylethyl 4-{[(methylsulfonyl)oxy]methyl}piperidine-1-carboxylate (1.8 g, 6.1 mmol) and cesium carbonate (4.0 g, 12.2 mmol). The mixture was heated to 70° C. for 3 h and then cooled to rt. Water and ethyl acetate were added followed by brine to reduce emulsification. The layers were partitioned, and the aqueous phase was extracted with ethyl acetate. The organic extracts were combined, dried over sodium sulfate, filtered, and concentrated in vacuo. The residue was purified by flash chromatography (70% hexanes, 30% ethyl acetate) to provide 1.77 g of 1,1-dimethylethyl 4-({[2-(cyanomethyl)-6-(methyloxy)phenyl]oxy}methyl)piperidine-1-carboxylate (4.9 mmol, 81% yield) as a yellow syrup. 1H NMR (400 MHz, CDCl3): δ7.03 (t, 1H), 6.93 (dd, 1H), 6.88 (dd, 1H), 4.14 (br m, 2H), 3.88 (br d, 2H), 3.84 (s, 3H), 3.70 (s, 2H), 2.00 (m, 1H), 1.86 (br d, 2H), 1.47 (s, 9H), 1.35-1.25 (m, 2H).

1. temperaturecooled to rt
2. customThe layers were partitioned
3. extractionthe aqueous phase was extracted with ethyl acetate
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe residue was purified by flash chromatography (70% hexanes, 30% ethyl acetate)