Reacción #78761

Ecuación de reacción

KF

N-methylpyrrole

TMEDA

n-BuLi

3-bromo-benzaldehyde

Me3SnCl

→

3-(1-methyl-1H-pyrrol-2-yl)benzaldehyde

Rendimiento 40.5%

Disolventes

ethyl acetate

Et2O

dioxane

THF

Condiciones de reacción

Tratamiento posterior

1. 1
   TemperaturaThe solution was heated
2. 2
   Temperaturato reflux under N2 for 1 h
3. 3
   TemperaturaAfter warming to room temperature
4. 4
   TemperaturaThe slurry was heated
5. 5
   Temperaturato reflux for 18 h
6. 6
   workup.STIRRINGstirred 15 min
7. 7
   FiltraciónThe slurry was filtered through celite
8. 8
   OtroThe organic layer was separated
9. 9
   Lavadowashed with brine
10. 10
    Secadodried (MgSO4)
11. 11
    Otroevaporated to an oil
12. 12
    OtroPurification by flash chromatography on silica gel eluting with 5% ethyl acetate in hexane

Procedimiento

EX-602A) To solution of N-methylpyrrole (0.97 mL, 11 mmol) in Et2O (20 mL) was added neat TMEDA (1.5 mL, 10 mmol) and 1.6 M n-BuLi in hexanes (6.3 mL, 10 mmol). The solution was heated to reflux under N2 for 1 h and then cooled to −78° C. A 1.0 M solution of Me3SnCl in THF was added over 15 min, and the resulting solution stirred for 30 min at −78° C. After warming to room temperature, 3-bromo-benzaldehyde (0.70 mL, 6.0 mmol), Pd(PPh3)2Cl2 (0.25 g, 0.35 mmol) and dioxane (10 mL) were added. The slurry was heated to reflux for 18 h. The cooled mixture was poured into a mixture of saturated KF and ethyl acetate and stirred 15 min. The slurry was filtered through celite. The organic layer was separated, washed with brine, dried (MgSO4) and evaporated to an oil. Purification by flash chromatography on silica gel eluting with 5% ethyl acetate in hexane gave 0.45 g (24%) of the desired 3-(1-methyl-1H-pyrrol-2-yl)benzaldehyde product as a yellow oil. MS: m/z=186.2 [M+H]+.

Fuente