Reacción #304524

Ecuación de reacción

5-amino-4′-methyl-biphenyl-3-carboxylic acid methyl ester

iso-amyl nitrite

diiodomethane

→

5-Iodo-4′-methyl-biphenyl-3-carboxylic acid methyl ester

Rendimiento 66.0%

Disolventes

piperidine CH3CN

Condiciones de reacción

Tratamiento posterior

1. 1
   TemperaturaThe mixture was then heated to 65° C.
2. 2
   workup.WAITkept at this temperature for 8 hours
3. 3
   OtroA vigorous exothermic reaction
4. 4
   OtroThe excess volatile reagents were removed by rotary evaporation
5. 5
   workup.ADDITIONThe residue was diluted with ethyl acetate
6. 6
   Lavadowashed with 10% hydrochloric acid, water, brine
7. 7
   Secadodried over anhydrous Na2SO4
8. 8
   Filtraciónfiltered
9. 9
   Concentraciónconcentrated in vacuo
10. 10
    OtroThe residue was purified by flash column chromatography
11. 11
    Lavadoeluting with n-hexane

Procedimiento

A mixture of 5-amino-4′-methyl-biphenyl-3-carboxylic acid methyl ester (10.9 g, 45.2 mmol), iso-amyl nitrite (36.5 ml, 271.4 mmol) and diiodomethane (23 ml, 271.4 mmol) was stirred at room temperature for 1 hour. The mixture was then heated to 65° C. and kept at this temperature for 8 hours. The reaction mixture to room temperature and then added to a stirred solution of piperidine/CH3CN (V:V=90 ml:90 ml). A vigorous exothermic reaction ensued. The excess volatile reagents were removed by rotary evaporation. The residue was diluted with ethyl acetate, washed with 10% hydrochloric acid, water, brine, dried over anhydrous Na2SO4, filtered and concentrated in vacuo. The residue was purified by flash column chromatography, eluting with n-hexane, followed by n-hexane/ethyl acetate (20:1), giving 5-Iodo-4′-methyl-biphenyl-3-carboxylic acid methyl ester as white yellow solid (10.5 g, 66%).

Fuente