Reacción #3078

Ecuación de reacción

(-)-8-chloro-6-hydroxy-octanoic acid

triethylamine

water

methanesulfonyl chloride

→

(-)-8-chloro-6-methanesulfonyloxy-octanoic acid

Disolventes

toluene

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.ADDITIONwere added slowly
2. 2
   workup.STIRRINGstirring
3. 3
   workup.WAITwas continued for a further 30 minutes
4. 4
   Otroafter which the organic phase was removed
5. 5
   Secadodried over magnesium sulfate
6. 6
   OtroThe solvent was then evaporated under vacuum

Procedimiento

The methyl ester of (-)-8-chloro-6-hydroxy-octanoic acid (-)-(VIII), (R=Me) (2.1 g, 10 mmoles) and 1.0 g (10 mmoles) of triethylamine were mixed in 40 ml of toluene. While cooling to an internal temperature of 10° to 15° C., 1.4 g (12 mmoles) of methanesulfonyl chloride were added slowly. Stirring was continued for 30 minutes. After the addition of 25 ml of water, stirring was continued for a further 30 minutes, after which the organic phase was removed and dried over magnesium sulfate. The solvent was then evaporated under vacuum. The methyl ester of (-)-8-chloro-6-methanesulfonyloxy-octanoic acid (-)-(II), (R=R'=Me) was obtained in a yield of 2.5 g (88% of the theoretical yield). [α]D20 =-31.3 (c=1; ethanol).

Fuente