Reacción #82172

Ecuación de reacción

(3aS-cis)-5-ethoxy-1,2,3,3a,8,8a-hexahydro-1,3a,8-trimethylpyrrolo[2,3-b]indole

nitronium tetrafluoroborate

→

(3aS-cis)-5-ethoxy-1,2,3,3a,8,8a- hexahydro-7-nitro-1,3a,8-trimethylpyrrolo[2,3-b]indole

Disolventes

chloroform

Condiciones de reacción

Tratamiento posterior

1. 1
   Otrothe reaction was quenched by the addition of ice and saturated sodium bicarbonate solution with vigorous stirring
2. 2
   OtroThe organic layer was separated
3. 3
   Secadodried over anhydrous sodium sulfate
4. 4
   Concentraciónconcentrated to an oil
5. 5
   OtroThis was purified by chromatography over silica gel
6. 6
   workup.ADDITIONThe fractions containing the product
7. 7
   Concentraciónconcentrated to an oil which
8. 8
   Otrocrystallized from hexane

Procedimiento

A degassed solution, under nitrogen, of 3.70 g of (3aS-cis)-5-ethoxy-1,2,3,3a,8,8a-hexahydro-1,3a,8-trimethylpyrrolo[2,3-b]indole in 50 ml of dry chloroform was treated with 2.00 g of nitronium tetrafluoroborate at a reaction temperature of +10°. After 20 minutes, the reaction was quenched by the addition of ice and saturated sodium bicarbonate solution with vigorous stirring. The organic layer was separated, dried over anhydrous sodium sulfate and concentrated to an oil. This was purified by chromatography over silica gel using ethyl acetate as the eluent. The fractions containing the product were combined and concentrated to an oil which crystallized from hexane to afford crystals of pure (3aS-cis)-5-ethoxy-1,2,3,3a,8,8a- hexahydro-7-nitro-1,3a,8-trimethylpyrrolo[2,3-b]indole, mp 106°-108° C.

Fuente