... Synlett 2004(8 ... Addition of piperidone 2 as a solution in THF at -60 °C afforded the desired addition product 8 in 92% yield. ... 1986, 29: 1517; For reports of moderate yields where enolization is likely, see: 5a Merschaert A. Delhaye L. Kestemont J. Brione W. Delbeke P. Mancuso V ...