Reacción #1463479

Ecuación de reacción

2-(1,3-dioxan-2-yl)ethyltriphenylphosphonium bromide

tetrahydrofuran

tetrahydrofuran

4-(3,4,5-trifluorophenyl)cyclohexanone

potassium t-butoxide

→

1-(2-(1,3-dioxan-2-yl)-ethylidene)-4-(3,4,5-trifluorophenyl)cyclohexane

Disolventes

ether

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroInto a three-necked flask equipped with a dropping fumel
2. 2
   Otroreached 10° C.
3. 3
   Otroup to room temperature
4. 4
   Otrofor one hour
5. 5
   workup.STIRRINGstirring for one hour
6. 6
   workup.STIRRINGfurther stirring the reaction mixture for 5 hours
7. 7
   workup.ADDITIONafter completion of the dropwise addition
8. 8
   Filtraciónfiltering off
9. 9
   Concentraciónconcentrating the filtrate under reduced pressure
10. 10
    Otroisolating
11. 11
    Otropurifying the resulting pale brown oil by means of silica gel column chromatography

Procedimiento

Into a three-necked flask equipped with a dropping fumel, a three-way cock and a thermometer was placed 2-(1,3-dioxan-2-yl)ethyltriphenylphosphonium bromide (12.2 g, 27 mole), followed by adding tetrahydrofuran (200 ml), suspending it, stirring under ice cooling till the liquid temperature reached 10° C., adding potassium t-butoxide (3.0 g, 27 mmols) to the reaction mixture, further elevating the temperature up to room temperature under ice cooling for one hour, stirring for one hour, dropwise adding a tetrahydrofuran (50 ml) solution of 4-(3,4,5-trifluorophenyl)cyclohexanone (5.7 g, 25 mmols) from the dropping funnel over 30 minutes, further stirring the reaction mixture for 5 hours after completion of the dropwise addition, adding ether (100 ml), allowing to stand for one hour, filtering off deposited insoluble substance, concentrating the filtrate under reduced pressure and isolating and purifying the resulting pale brown oil by means of silica gel column chromatography, to obtain 1-(2-(1,3-dioxan-2-yl)-ethylidene)-4-(3,4,5-trifluorophenyl)cyclohexane.

Fuente