反应详情

温度

125 °C

A mixture of 3-bromo-4-oxo-1-piperidinecarboxylic acid ethyl ester (13.5 g, 26.99 mmol) and trans-cinnamamide (3.0 g, 20.7 mmol) was supported in silica gel (48 g) and mechanically stirred at 125° C. for 60 hours. The product was eluted from the silica gel with a 7M solution of ammonia in MeOH (3×140 mL). The filtrate was evaporated in vacuo and the crude product was basified with a saturated solution of NaHCO3 and extracted with DCM. The organic layer was separated, dried (Na2SO4), filtered and the solvent evaporated in vacuo. The crude product was purified by flash column chromatography (silica; AcOEt in DCM 0/100 to 20/80). The desired fractions were collected and the solvents evaporated in vacuo to yield 6,7-dihydro-2-[(E)-2-phenylethenyl]-oxazolo[5,4-c]pyridine-5(4H)-carboxylic acid ethyl ester (1.65 g, 27% yield) as an orange oil. C17H18N2O3 LCMS: Rt 2.91, m/z 299 [M+H]+ (using method, LC-MS Method 6)

1. washThe product was eluted from the silica gel with a 7M solution of ammonia in MeOH (3×140 mL)
2. customThe filtrate was evaporated in vacuo
3. extractionextracted with DCM
4. customThe organic layer was separated
5. dry with materialdried (Na2SO4)
6. filtrationfiltered
7. customthe solvent evaporated in vacuo
8. customThe crude product was purified by flash column chromatography (silica; AcOEt in DCM 0/100 to 20/80)
9. customThe desired fractions were collected
10. customthe solvents evaporated in vacuo