反应详情

温度

0 °C

According to the general procedure outlined in J. Med Chem. 1986, Vol. 30, p. 3575, 15.0 g norleucine (Nle) was mixed with 200 mL benzyl alcohol and cooled to 0° C. Thionyl chloride (25 ml) was added dropwise over 15 min. and the mixture was slowly heated to 90° C. with a fierce evolution of SO2 occurring at about 50° C. After 2 h at 90° C. the mixture was cooled to 0° C. and 25 mL more thionyl chloride was added. The mixture was then heated again at 90° C. for 2 h, cooled, diluted with 1.6 L ether and stored overnight at 0° C. The crystals which formed were filtered, washed with ether and dried to give 23.1 g of a damp solid which was recrystallized from 1:10 ethanol-ether, using 23 mL ethanol. The filtered and dried solid weighed 17.1 g, TLC Rf 0.25 in System C (the spotted plate was exposed to ammonia vapor and dried prior to elution).

1. temperaturethe mixture was slowly heated to 90° C. with a fierce evolution of SO2 occurring at about 50° C
2. temperatureAfter 2 h at 90° C. the mixture was cooled to 0° C.
3. temperatureThe mixture was then heated again at 90° C. for 2 h
4. temperaturecooled
5. customThe crystals which formed
6. filtrationwere filtered
7. washwashed with ether
8. customdried