Stereoselective tetrahydropyrido[2,1-a]isoindolone synthesis via carbanionic and radical intermediates: a model study for the Tacaman alkaloid D/E ring fusion
作者:Roger Hunter、Philip Richards
DOI:10.1016/s0040-4039(00)00485-8
日期:2000.5
cyclisation of malic acid-derived α-sulfanyllactam (1) via radical and carbanionic intermediates affords stereo-defined tetrahydropyrido[2,1-a]isoindolones as model compounds for the D/E cis-ring fusion of the Tacaman indole alkaloid skeleton. A transition-state model to explain the stereoselectivity is presented.
通过自由基和碳负离子中间体对苹果酸衍生的α-磺胺基内酰胺(1)进行立体选择性环化,提供了立体定义的四氢吡啶并[2,1- a ]异吲哚并酮作为塔卡曼吲哚生物碱骨架D / E顺式环融合的模型化合物。提出了解释立体选择性的过渡态模型。
Stereoselective tetrapyrido[2,1-a]isoindolone synthesis via carbanionic and radical intermediates: a model study for the Tacaman alkaloid D/E ring fusion
作者:Roger Hunter、Philip Richards
DOI:10.1039/b303031h
日期:——
been attributed to the steric influence imposed by the bulky tert-butyldiphenylsilyloxy chiral auxiliary allylic to the enoate ester. The product stereochemistries provide models for the required cis-stereochemistry of the D/Eringfusion of the Tacaman alkaloid skeleton via the relatively unexplored C-3-C-14 bond disconnection.