不对称的温多洛辛,温多林和关键的温布拉斯类型的总合成
Yoshikazu Sasaki1, Daisuke Kato, Dale L Boger
1Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.
Journal of the American Chemical Society
|September 3, 2010
概括
使用一种新的循环添加级联,实现了vindoline和vindorosine的简洁合成. 这种方法有效地确定了关键的立体中心和结构特征,使得生物研究能够创建新的类似物.
科学领域:
- 有机化学 有机化学
- 合成化学 合成化学
- 药用化学 医学化学
背景情况:
- 芬多林和芬多是复杂的天然产品,具有显著的制药潜力.
- 这些化合物的先前合成途径往往是漫长和低效的.
- 了解它们的结构-活动关系需要获得合成类似物.
研究的目的:
- 开发简洁和不对称的vindoline和vindorosine的总合成.
- 建立基于分子内循环添加级联的新型合成策略.
- 为生物评估准备vindoline和vinblastine的新型类似物.
主要方法:
- 1,3,4-oxadiazoles的分子内 [4 + 2]/[3 + 2] 循环添加级联.
- 在迪尔斯-阿尔德反应中对立体选择性进行奇拉尔替代剂控制.
- 开发一个用于功能化的环膨胀反应.
- 芬多林和芬多洛辛类似物的合成.
主要成果:
- 实现了vindoline和vindorosine的简洁不对称的总合成.
- 建立了一个级联反应,在一个步骤中设置六个立体中心和关键结构特征.
- 开发了新的合成路径,用于具有深层结构修改的vindoline类似物.
- 准备的温布拉斯类型,包括修改的温多林核.
结论:
- 开发的循环添加级联策略为vindoline,vindorosine及其类似物提供了有效的访问.
- 合成类型被用来探测布拉斯在活性中的Δ(6,7) - 双键的重要性.
- 这项工作提供了一个强大的平台来探索醇类化合物的药用化学成分.
相关概念视频
Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation
Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry
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Diels–Alder Reaction Forming Cyclic Products: Stereochemistry
The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
Cycloaddition Reactions: Overview
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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