反应详情

温度

-78 °C

Under argon atmosphere, in 3 ml of methylene chloride was dissolved 202.8 mg (0.5 mmol) of 3-benzyl-5-((1S,2S,5R)-5-methyl-2-(1-methyl-1-phenylethyl)cyclohexyloxy)-2(3H)-oxazolone, and after the solution was cooled to −78° C., 67.1 mg (0.5 mmol) of hydrocinnamaldehyde and 63 μl (0.1 mmol) of boron trifluoride diethyl etherate were added to the solution and the mixture was reacted for 1.0 hour. After the temperature of the mixture was raised up to the room temperature, 15 ml of a saturated aqueous sodium hydrogen carbonate solution was added to the resulting reaction mixture and the mixture was extracted with 15 ml of methylene chloride. The organic layer was washed twice with 15 ml of water, dried over anhydrous magnesium sulfate and concentrated under reduced pressure to obtain 264.9 mg (0.49 mmol) of 3-benzyl-4-((1S,2S,5R)-5-methyl-2-(1-methyl-1-phenylethyl)cyclohexyloxy)carbonyl-5-(2-phenylethyl)-2-oxazolidinone as pale yellowish viscous liquid. A formation ratio of cis/trans isomers was cis isomer/trans isomer=29/71 according to 1H-NMR, and they were each single diastereomer. Yield based on 3-benzyl-5-((1S,2S,5R)-5-methyl-2-(1-methyl-1-phenylethyl)cyclohexyloxy)2(3H)oxazolone was 98.2%.

1. customthe mixture was reacted for 1.0 hour
2. additionwas added to the resulting reaction mixture
3. extractionthe mixture was extracted with 15 ml of methylene chloride
4. washThe organic layer was washed twice with 15 ml of water
5. dry with materialdried over anhydrous magnesium sulfate
6. concentrationconcentrated under reduced pressure