反应详情

Add 2,2-dimethyl-oxirane (3.0 mL, 33.3 mmol) to a stirred suspension of lithium perchlorate (3.39 g, 31.9 mmol) in anhydrous acetonitrile (40 mL). Stir for one hour under nitrogen at room temperature. Add 4-{[(2,4-dichloro-thiazol-5-yl)methyl]-amino}-piperidine-1-carboxylic acid tert-butyl ester (1.1337 g, 3.10 mmol) in anhydrous acetonitrile (15 mL). Heat the reaction at reflux for 72 hours under nitrogen. Pour the reaction into saturated sodium bicarbonate (100 mL) and extract with ethyl acetate (3×100 mL). Dry the ethyl acetate over sodium sulfate and then filter off the sodium sulfate. Concentrate on a rotary evaporator and purify the crude product by flash chromatography on silica gel eluting with 30% ethyl acetate/hexanes to yield 0.4527 g (33%) of 4-{[(2,4-dichloro-thiazol-5-yl)methyl]-(2-hydroxy-2-methyl-propyl)-amino}-piperidine-1-carboxylic acid tert-butyl ester: mass spectrum (ion spray): m/z=438.2 (M+1); 1H NMR (CDCl3): δ=4.22 (br s, 2H), 3.97 (s, 2H), 2.67-2.59 (m, 3H), 2.50 (s, 2H), 1.77-1.74 (m, 2H), 1.60 (s, 2H), 1.49 (s, 9H), 1.47-1.35 (m, 1H), 1.23 (s, 6H).

1. temperatureHeat
2. customthe reaction
3. temperatureat reflux for 72 hours under nitrogen
4. additionPour
5. extractionextract with ethyl acetate (3×100 mL)
6. dry with materialDry the ethyl acetate over sodium sulfate
7. filtrationfilter off the sodium sulfate
8. concentrationConcentrate on a rotary evaporator
9. custompurify the crude product by flash chromatography on silica gel eluting with 30% ethyl acetate/hexanes