Reacción #3032

Ecuación de reacción

3,5-di-tert-butyl-4-hydroxybenzaldehyde

rhodanine

water

ethanol

→

5-[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methylene]-2-thioxo-4-thiazolidinone

Disolventes

acetic acid

Condiciones de reacción

Tratamiento posterior

1. 1
   TemperaturaAfter heating for 23 hours
2. 2
   Temperaturathe reaction mixture was cooled
3. 3
   workup.STIRRINGafter stirring for 30 minutes
4. 4
   Filtraciónthe resulting precipitate was recovered by filtration
5. 5
   Filtraciónfiltered
6. 6
   workup.DISSOLUTIONThe precipitate was then dissolved in 3 liters of ethanol
7. 7
   Temperaturaheated
8. 8
   workup.ADDITIONwater was added until the solution
9. 9
   Filtración99.6 g of the desired title product were recovered by filtration, m.p. approximately 260° C.

Procedimiento

Under a nitrogen atmosphere, 117.2 g of 3,5-di-tert-butyl-4-hydroxybenzaldehyde, 66.6 g of rhodanine, and 143.5 g of fused sodium acetate were heated at reflux in 2500 ml of glacial acetic acid. After heating for 23 hours, the reaction mixture was cooled and poured into a mixture of 1 liter of ethanol and 1 liter of ice with stirring. 500 ml of water were added and, after stirring for 30 minutes, the resulting precipitate was recovered by filtration. The solid was slurried with 500 ml of ethyl acetate and filtered. The precipitate was then dissolved in 3 liters of ethanol, heated to boiling, and water was added until the solution remained cloudy (approximately 450 ml). Upon cooling to room temperature, 99.6 g of the desired title product were recovered by filtration, m.p. approximately 260° C.

Fuente