반응 #489024

반응 방정식

(E)-but-2-enoyl chloride

nBuLi

hexane

(S)-4-Benzyloxazolidin-2-one

THF

→

desired product

수율 79.0%

(1S,2S,4S)-2,4-dimethylcyclohexanecarboxylic acid

수율 79.0%

반응 조건

후처리

1. 1
   기타The cold bath was removed
2. 2
   workup.STIRRINGto stir at room temperature for 1 h, whereupon saturated NH4Cl solution (200 mL)
3. 3
   workup.ADDITIONwas added
4. 4
   기타Most of the THF was removed under vacuum
5. 5
   기타the mixture was partitioned between ether and brine
6. 6
   건조After drying over Na2SO4
7. 7
   농축the organic layer was concentrated
8. 8
   기타the residue purified by silica gel chromatography (20% EtOAc in hexanes)

실험 절차

(S)-4-Benzyloxazolidin-2-one (35 g, 0.2 mol) was dissolved in THF (500 mL) and cooled to −78° C. A solution of nBuLi in hexane (80 mL, 0.2 mol) was added dropwise. The solution was stirred at this temperature for 30 min and then (E)-but-2-enoyl chloride (19 mL, 0.2 mol) was added slowly. The cold bath was removed and the reaction was allowed to stir at room temperature for 1 h, whereupon saturated NH4Cl solution (200 mL) was added. Most of the THF was removed under vacuum and the mixture was partitioned between ether and brine. After drying over Na2SO4, the organic layer was concentrated and the residue purified by silica gel chromatography (20% EtOAc in hexanes) to give the desired product (39 g, 79% yield) as a white solid.

출처