Reacción #49182

Ecuación de reacción

6-amino hexanoic acid

phthalic anhydride

triethyl amine

→

compound 41a

Rendimiento 93.8%

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

Rendimiento 93.8%

Disolventes

toluene

Condiciones de reacción

Tratamiento posterior

1. 1
   TemperaturaThe suspension was refluxed
2. 2
   OtroWhen collection of water
3. 3
   Temperaturathe reaction was cooled
4. 4
   Otroevaporated to dryness
5. 5
   workup.ADDITIONconc. hydrochloric acid (1.5 mL) was added
6. 6
   Filtraciónfiltered
7. 7
   LavadoThe precipitate was washed with water
8. 8
   Secadodried over sodium sulfate

Procedimiento

6-amino hexanoic acid (39a) (13.1 g, 100 mmol) and phthalic anhydride (40) (14.8 g, 100 mmol) were mixed in toluene (150 mL). To the suspension was added triethyl amine (13 mL). The suspension was refluxed using Dean-stark for 16 h. When collection of water ceased, the reaction was cooled and evaporated to dryness. The residue was suspended in water and conc. hydrochloric acid (1.5 mL) was added. The suspension was stirred for 30 mins and filtered. The precipitate was washed with water and dried over sodium sulfate to afford compound 41a (24.5 g, 93%) which was used as such for the next step.

Fuente