Reacción #1869180

Ecuación de reacción

dimethylsulfoxide

sodium hydride

dimethylsulfoxide

benzyl 4-oxo-1-piperidinecarboxylate

dimethylsulfoxide

water

→

title compound

benzyl 4-methylene-1-piperidinecarboxylate

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.ADDITIONwas added the reaction mixture
2. 2
   workup.STIRRINGthe mixture was stirred for 1 hour at 50° C
3. 3
   TemperaturaAfter cooling, to the mixture
4. 4
   Extracciónthe mixture was extracted with ethyl acetate (1.5 L)
5. 5
   LavadoThe organic layer was washed with a saturated aqueous solution of ammonium chloride (0.5 L)
6. 6
   Secadoa saturated aqueous solution of sodium chloride (0.5 L), dried
7. 7
   Concentraciónconcentrated
8. 8
   OtroThe obtained residue was purified by column chromatography on silica gel (n-hexane:ethyl acetate:chloroform=9:1:1)

Procedimiento

A sodium hydride (13.2 g) was added to an anhydrous dimethylsulfoxide (176 mL) and the mixture was heated for 2 hours at 60° C. After cooling, to a suspension of methyltriphenylphosphonium bromide (110.4 g) in dimethylsulfoxide (120 mL) was added the reaction mixture, and the mixture was stirred for 30 minutes at room temperature. To the reaction mixture was added a solution of benzyl 4-oxo-1-piperidinecarboxylate (60 g) in dimethylsulfoxide (150 mL), the mixture was stirred for 1 hour at 50° C. After cooling, to the mixture was added water (2.5 L) and the mixture was extracted with ethyl acetate (1.5 L). The organic layer was washed with a saturated aqueous solution of ammonium chloride (0.5 L) and a saturated aqueous solution of sodium chloride (0.5 L), dried and then concentrated. The obtained residue was purified by column chromatography on silica gel (n-hexane:ethyl acetate:chloroform=9:1:1) to give the title compound (51.1 g) having the following physical data.

Fuente