Reacción #49183

Ecuación de reacción

compound 41a

6-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-hexanoic acid

diisopropyl carbodiimide

pentafluoro phenol

→

Compound 43a

Rendimiento 101.3%

6-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-hexanoic acid pentafluorophenyl ester

Rendimiento 101.3%

Disolventes

dichloromethane

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroAfter overnight the reaction mixture was evaporated to dryness
2. 2
   workup.ADDITIONTo the residue ethyl acetate (100 mL) was added
3. 3
   Filtraciónthe filtered
4. 4
   Otroto remove diisopropyl urea
5. 5
   LavadoThe precipitate was washed with ethyl acetate (50 mL)
6. 6
   LavadoThe combined organic layer was washed with saturated sodium bicarbonate and water
7. 7
   SecadoThe organic layer was dried over sodium sulfate
8. 8
   Filtraciónfiltered
9. 9
   Otroevaporated to dryness

Procedimiento

Referring to scheme 12, compound 41a (13.3 g, 51 mmol) was dissolved in anhydrous dichloromethane (40 mL) and cooled to 0° C. under argon. To the solution were added diisopropyl carbodiimide (6.31 g, 7.7 mL, 50 mmol) and pentafluoro phenol (42, 9.2 g, 50 mmol). After overnight the reaction mixture was evaporated to dryness. To the residue ethyl acetate (100 mL) was added and the filtered to remove diisopropyl urea. The precipitate was washed with ethyl acetate (50 mL). The combined organic layer was washed with saturated sodium bicarbonate and water. The organic layer was dried over sodium sulfate, filtered and evaporated to dryness. Compound 43a (Rf=0.8 in 10% EtOAc/Hexane, 21.65 g, 92%) was obtained, which was directly used for the next step without further purification.

Fuente