Concise Substrate-Controlled Asymmetric Total Syntheses of Dioxabicyclic Marine Natural Products with 2,10-Dioxabicyclo-[7.3.0]dodecene and 2,9-Dioxabicyclo[6.3.0]undecene Skeletons
作者:Mi Jung Kim、Te-ik Sohn、Deukjoon Kim、Robert S. Paton
DOI:10.1021/ja310249u
日期:2012.12.12
0]undecene skeleton from commercially available glycidol as a common starting material. The former include (-)-isolaurallene (1), the enantiomeric form of natural (+)-neolaurallene (2), and (+)-itomanallene A (3c), and the latter are (+)-laurallene (4) and (+)-pannosallene (5a). In addition, our first syntheses of 3c and 5a established the structure and absolute stereochemistry of both natural products
我们报告了一种完全底物控制的方法,用于不对称全合成具有代表性的二氧杂双环溴丙二烯海洋天然产物,其具有来自市售的 2,10-二氧杂双环 [7.3.0] 十二烯或 2,9-二氧杂双环 [6.3.0] 十一烯骨架缩水甘油作为常见的原料。前者包括 (-)-isoolaurallene (1)、天然 (+)-neolaurallene (2) 的对映体形式和 (+)-itomanallene A (3c),后者是 (+)-laurallene (4) 和(+)-pannosallene (5a)。此外,我们对 3c 和 5a 的首次合成确定了这两种天然产物的结构和绝对立体化学。我们分别建立中环(oxonene 或oxocene)和四氢呋喃的α,α'-相对立体化学的一般方法,涉及我们的保护基依赖性分子间酰胺烯醇烷基化(化学选择性螯合控制或二阴离子烷基化)与我们的分子内酰胺烯醇或腈阴离子烷基化的明智配对