Asymmetric synthesis of 2-substituted piperidines using a multi-component coupling reaction: rapid assembly of (S)-coniine from (S)-1-(1-phenylethyl)-2-methyleneaziridine
作者:Jerome F. Hayes、Michael Shipman、Heather Twin
DOI:10.1039/b106260n
日期:——
(S)-Coniine is made using a reaction which assembles the piperidine ring by the sequential formation of four new chemical bonds and installs the C-2 stereogenic centre with high levels of diastereocontrol (90% de).
efficient asymmetric synthesis of enantiopure (S)-(+)-coniine is reported. Anodic cyanation of (-)-1-[(1S)-1-phenylethyl]piperidine, derived from [(1S)-1-phenylethyl]amine, results in regioselective formation of the corresponding α-amino-nitrile, which was alkylated with propyl iodide to give a bifunctional derivative. The latter underwent a stereoselectivereductivedecyanation (80% de), the product