Reaktion #2208137

Reaktionsgleichung

benzyl 1-oxa-6-aza-spiro[2.5]octane-6-carboxylate

piperidone

dimethylsulfoxonium methylide

4-aminobenzonitrile

→

title compound

Benzyl 4-((N-(4-cyanophenyl)amino)methyl)-4-hydroxypiperidine-1-carboxylate

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigethe excess of the aniline was removed by chromatography on silica gel with dichloromethane

Vorschrift

A mixture of 20.0 g (80.9 mmol) benzyl 1-oxa-6-aza-spiro[2.5]octane-6-carboxylate (prepared from the protected piperidone and dimethylsulfoxonium methylide according to J. Med. Chem. 1983, 26, 855; U.S. Pat. No. 4,353,901) and 47.0 g (397.8 mmol) 4-aminobenzonitrile were heated at 160° C. for 30 hours until no starting epoxide could be detected by TLC. It was cooled to room temperature, and the excess of the aniline was removed by chromatography on silica gel with dichloromethane. The title compound was obtained after enhancing the polarity of the eluent by addition of 5% ethanol.

Quelle