反应详情

温度

0 °C

To a THF (20 ml) solution containing geranic acid (1.68 g, 10 mmols), triethylamine (1.01 g, 10 mmols) was added and cooled to 0° C., into which a THF (5 ml) solution of isobutyl chloroformate (1.37 g, 10 mmols) was added dropwise, followed by 30 minutes' stirring at 0° C. To the reaction mixture a solution of cysteine (1.35 g, 10 mmols) as dissolved in 1N sodium hydroxide (10 ml) was added, followed by an hour's stirring at 0° C. and further 4 hours' stirring at room temperature. After termination of the reaction, 10 ml of 1N hydrochloric acid was added to the reaction mixture and stirred for 10 minutes at room temperature. Then the reaction mixture was condensed with a rotary evaporator. To the residue ethanol was added, and whereupon precipitated sodium chloride was removed by filtration. The ethanol solution was once again condensed under reduced pressure with the evaporator, and the residue was separated on silica gel column chromatography. Thus 0.556 g of the title compound was obtained from the hexane-acetone (2:1) distillate. The yield was 19.5%:

1. additionwas added
2. additionwas added dropwise
3. additionwas added
4. waitfollowed by an hour
5. stirring's stirring at 0° C. and further 4 hours'
6. stirringstirring at room temperature
7. additionwas added to the reaction mixture
8. stirringstirred for 10 minutes at room temperature
9. customcondensed
10. customwith a rotary evaporator
11. additionTo the residue ethanol was added
12. customwhereupon precipitated sodium chloride
13. customwas removed by filtration
14. customcondensed under reduced pressure
15. customwith the evaporator
16. customthe residue was separated on silica gel column chromatography