Remarkable stereocontrol in the synthesis of 1,2,3,5-tetrasubstituted tetrahydropyrans via an asymmetric heterocycloaddition of a ketone-derived enol ether
作者:J GONG、E BONFAND、E BROWN、G DUJARDIN、V MICHELET、J GENET
DOI:10.1016/s0040-4039(03)00162-x
日期:2003.3.3
The synthesis of chiral 1,2,3,5-substituted tetrahydropyrans has been realized via an asymmetric hetero Diels–Alder (HDA) reaction. The key step that involved a trisubstituted chiral enol ether derived from (R)-mandelic acid as the dienophile promoted the creation of three stereogenic centers with a remarkable and unprecedented endo and facial stereocontrol. The hydrogenation of the heteroadduct 2
手性1,2,3,5-取代的四氢吡喃的合成已通过不对称杂Diels-Alder(HDA)反应实现。涉及衍生自(R)-扁桃酸的三取代手性烯醇醚作为亲二烯体的关键步骤促进了三个立体形成中心的产生,其具有显着且前所未有的内在和面部立体控制。通过在木炭和二异丙基乙胺上使用Pd优化杂加合物2的氢化反应,得到独特的异构体。手性诱导剂通过缩醛还原反应进行了清洁和立体选择性去除,这证明了该方法对于有效构建生物活性分子关键中间体的潜力。