Stereodivergent Synthesis of Iminosugars from Stannylated Derivatives of (<i>S</i>)-Vinylglycinol
作者:Alexandre Lumbroso、Isabelle Beaudet、Loïc Toupet、Erwan Le Grognec、Jean-Paul Quintard
DOI:10.1021/ol303213r
日期:2013.1.4
An original access to iminosugars from a cis/trans mixture of stannylated oxazolidinones 5 is reported. The dehydropiperidines 7-trans and 7-cis were obtained stereoselectively with an RS and SS configuration depending on the order of the Sn-Li transmetalation (followed by electrophilic trapping) and of the ring closing metathesis reactions due to the stereoselective epimerization of the alpha-aminoanion intermediate. The dehydropiperidines 7-trans and 7-cis were subsequently used for the synthesis of enantiopure homonojirimycin analogs.