Synthesis of Highly-Substituted Enantiomerically Pure Allylboronic Esters and Investigation of Their Stereoselective Addition to Aldehydes
作者:Roza Vahabi、Wolfgang Frey、Jörg Pietruszka
DOI:10.1021/jo402130u
日期:2013.11.15
Diastereomerically pure allylboronates bearing the readily available tartrate derivative were obtained via sigmatropic rearrangement. Allyl additions were performed, and the influence of γ-disubstituted allylboronates was studied. Highly γ-substituted boronic esters were found to lead to the corresponding enantiomerically enriched homoallyl alcohols with exclusively E configuration; their synthesis and the mechanism
通过σ重排获得具有易得的酒石酸酯衍生物的非对映体纯的烯丙基硼酸酯。进行烯丙基加成,并研究了γ-二取代烯丙基硼酸酯的影响。发现高度γ-取代的硼酸酯会导致相应的对映异构体富集的纯烯丙基醇具有完全E构型。本文提出了它们的合成及反应机理。