(±)-vinoxine的全合成是通过Tf 2 O介导的Bischler-Napieralski反应组装多取代的四氢吡啶并[1,2- a ]吲哚骨架来实现的。基于C3位置的一种立体化学,通过自由基环化立体选择性地构建了特征性的二氮杂双环[3.3.1]壬烷骨架。已建立的方法为合成含有多取代吡啶并[1,2- a ]吲哚骨架的天然产物和药物提供了新的选择。
Bioinspired Divergent Oxidative Cyclizations of Geissoschizine: Total Synthesis of (–)‐17‐nor‐Excelsinidine, (+)‐16‐
<i>epi</i>
‐Pleiocarpamine, (+)‐16‐Hydroxymethyl‐Pleiocarpamine and (+)‐Taberdivarine H
作者:Maxime Jarret、Aurélien Tap、Victor Turpin、Natacha Denizot、Cyrille Kouklovsky、Erwan Poupon、Laurent Evanno、Guillaume Vincent
DOI:10.1002/ejoc.202000962
日期:2020.10.31
To synthesize excelsinidines and mavacurans alkaloids, bio‐inspired oxidativecyclizations of (+)‐geissochizine and analogues mediated by KHMDS/I2 were studied. Applied to geissoschizine, the N4–C16 bond formation led to excelsinidines core. Quaternization of the aliphatic nitrogen was necessary to access the mavacurans core (N1–C16 bond). Alternatively, 17‐nor‐excelsinidine was synthetized via an
为了合成excelsinidines和mavacurans生物碱,研究了由KHMDS / I 2介导的(+)-geissochizine及其类似物的生物启发性氧化环化作用。应用于Geissoschizine时,N4-C16键的形成导致了Excelsinidines的核心。脂族氮的季铵化是进入马六甲聚糖核心(N1-C16键)所必需的。或者,通过α-氯内酰胺的分子内亲核取代合成17-或excelsinidine。
Bioinspired Oxidative Cyclization of the Geissoschizine Skeleton for Enantioselective Total Synthesis of Mavacuran Alkaloids
Reported is the enantioselective total syntheses of mavacuran alkaloids, (+)‐taberdivarineH, (+)‐16‐hydroxymethyl‐pleiocarpamine, and (+)‐16‐epi‐pleiocarpamine, and their postulated biosynthetic precursor 16‐formyl‐pleiocarpamine. This family of monoterpene indole alkaloids is a target of choice since some of its members are subunits of intricate bisindole alkaloids such as bipleiophylline. Inspired
报道了马卡武兰生物碱,(+)-二萜H,(+)-16-羟甲基-pleiocarpamine和(+)-16- epi -pleiocarpamine及其假定的生物合成前体16-formyl -pleiocarpamine的对映体选择性合成。该单萜吲哚生物碱家族是一个选择的目标,因为它的某些成员是复杂的双吲哚生物碱的亚基,例如双叶茶碱。受生物合成假说的启发,探索了从Geissoschizine框架形成N1-C16键的氧化偶联方法。脂族氮中心的季铵化是实现KHMDS / I 2诱导的氧化偶联的关键,因为它掩盖了脂族氮中心的亲核性并锁定了所需的顺式构象。
Total Synthesis of Scholarisine K and Alstolactine A
作者:Dan Wang、Min Hou、Yue Ji、Shuanhu Gao
DOI:10.1021/acs.orglett.7b00722
日期:2017.4.7
The first asymmetric total syntheses of scholarisine K and alstolactine A have been accomplished. Our syntheses feature (1) ring closure metathesis and an intramolecular Heck reaction to construct the 1,3-bridged [3,3,1] bicycle (C–D ring), (2) intramolecular alkylation followed by Fischer indolization to form the basic skeleton of akuammilines, and (3) bioinspired, acid-promoted epoxide opening/lactonization
An Indoxyl-Based Strategy for the Synthesis of Indolines and Indolenines
作者:Yuanyuan Yu、Guang Li、Long Jiang、Liansuo Zu
DOI:10.1002/anie.201505173
日期:2015.10.19
the synthesis of indolines and indolenines via unprecedented aza‐pinacol and aza‐semipinacol rearrangements was developed. This method provides direct access to the core structures of several classes of indole alkaloids. The synthetic utility was demonstrated by the divergent synthesis of an array of functionalized polycyclic structures from a common intermediate and the formal total synthesis of the
Reported herein is the total synthesis of calophyline A, an indoline naturalproduct possessing distinct ring connectivity which has not been synthesized previously. The synthetic route features several key transformations, including an aza‐pinacol rearrangement to construct the nitrogen‐containing bridged [3.2.2] bicycle, a Heck cyclization to assemble the fused 6/5/6/5 ring system, and a challenging