2,6-Disubstituted and 2,2,6-Trisubstituted Piperidines from Serine: Asymmetric Synthesis and Further Elaboration
作者:Hukum P. Acharya、Derrick L. J. Clive
DOI:10.1021/jo101010c
日期:2010.8.6
4-Hydroxy-3,4-dihydro-2H-pyridine-1-carboxylic acid benzyl esters, which are readily prepared from serine and terminal acetylenes, undergo Claisenrearrangement to piperidine derivatives when heated with butyl vinyl ether in the presence of Hg(OAc)2 and Et3N. This route to optically pure piperidines having substituents α to nitrogen is general, and the rearrangement products are versatile intermediates for making