Tetrahydrofuran → HCID 20288021, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred mixture of 41 parts of diethyl [2-(3-methoxyphenyl)-2-oxoethyl]phosphonate and 180 parts of tetrahydrofuran are added portionwise 5 parts of sodium hydride dispersion 61% while cooling at about 15° C. Upon completion, stirring is continued for 30 minutes at room temperature. Then there are added dropwise 21 parts of ethyl 4-oxo-1-piperidinecarboxylate at about 20° C. Stirring is continued for 4 hours at 60° C. The reaction mixture is cooled, water is added and the layers are separated. The organic phase is dried, filtered and evaporated. The residue is distilled, yielding 30 parts (83%) of ethyl 2,3-dihydro-4-[2-(3-methoxyphenyl)-2-oxoethyl]-1(6H)-pyridinecarboxylate; bp. 200°-210° C. at 1 mm. pressure.

Provenance & Evidence