本研究实现了(+)-discorhabdin B、(−)-discorhabdin H、(+)-discorhabdin K和(−)-阿留申胺的全合成。由苯并噻吩-2-甲酸甲酯制备带有对应于D/E/G环部分的邻-新戊酰硫基的苯乙胺片段,并与已知的吡咯亚氨基醌衍生物缩合。对该加合物进行[双(三氟乙酰氧基)碘]苯(PIFA)促进的氧化螺环化,以提供与吡咯亚氨基醌稠合的A/B/C/D/E螺环己二烯酮。(±)-discorhabdin B 的全合成是通过具有N , S -缩醛部分的高张力 G 环的关键构建完成的,该环具有新开发的 CuBr 2介导的氧化级联环化。(+)-discorhabdin B 的立体控制全合成是通过使用手性硫酯的非对映选择性 PIFA 促进的氧化螺环化来完成的。(−)-Discorhabdin H 和 (+)-discorhabdin K 通过将l -卵硫醇 A 进行位点和面选择性硫杂迈克尔加成到
由于自然稀缺性和合成效率低下,不常见的吲哚半萜类霉霉盘素 A 的结构-活性关系尚不清楚。已经建立了利用 Larock 吲哚合成的模块化方法来获取支菌素 A 和不同的连苯酰吲哚集合。它的特点是利用廉价的 (+)-香紫苏内酯、模块化、纯化经济性和可扩展性,这有助于对支菌素 A 和相关前体的首次生物学评估。
作者:Xiao-Shan Ning、Xin Liang、Kang-Fei Hu、Chuan-Zhi Yao、Jian-Ping Qu、Yan-Biao Kang
DOI:10.1002/adsc.201701512
日期:2018.4.17
A Pd‐tBuONO co‐catalyzed scalable and practical synthesis of indoles with molecular oxygen as terminal oxidant is developed. Either terminal or internal 2‐vinylanilines could be smoothly converted to desired indoles under one general condition. This method has been evaluated in the large scale synthesis of indomethacin and a potential anti‐breast cancer drug candidate 1.
Total Synthesis of the Alkaloid (±)-Aspidophytine Based on Carbonyl Ylide Cycloaddition Chemistry
作者:José M. Mejía-Oneto、Albert Padwa
DOI:10.1002/hlca.200890034
日期:2008.2
The RhII-catalyzed cycloaddition cascade of an indolyl-substituted α-diazo imide was used for the totalsynthesis of the complex pentacyclic alkaloid (±)-aspidophytine. Treatment of the resulting dipolar cycloadduct with BF3⋅OEt2 induces a domino fragmentation cascade. The reaction proceeds by an initial cleavage of the oxabicyclic ring and formation of a transient N-acyl iminium ion which reacts further
approach in the field of targeted drug delivery is the establishment of abiotic metal‐triggeredprodrug mechanisms that can control the release of bioactive drugs. Currently, the design of prodrugs that use abiotic metals as a trigger relies heavily on uncaging strategies. Here, we introduce a strategy based on the gold‐catalyzed activation of a phenanthridinium‐based prodrug via hydroamination under physiological
靶向药物递送领域的一种新兴方法是建立可以控制生物活性药物释放的非生物金属触发前药机制。目前,使用非生物金属作为触发剂的前药设计在很大程度上依赖于解笼策略。在这里,我们介绍了一种基于在生理条件下通过加氢胺化对菲啶基前药进行金催化活化的策略。为了使前药策略具有生物相容性,使用基于人血清白蛋白而不是游离金金属络合物的金人工金属酶 (ArM) 作为前药激活的触发器。即使在体外存在高达 1 mM 谷胱甘肽的情况下,基于白蛋白的金 ArM 也能保护结合的金金属的催化活性。
Synthesis of 2-BMIDA Indoles via Heteroannulation: Applications in Drug Scaffold and Natural Product Synthesis
作者:George E. Bell、James W. B. Fyfe、Eva M. Israel、Alexandra M. Z. Slawin、Matthew Campbell、Allan J. B. Watson
DOI:10.1021/acs.orglett.2c00959
日期:2022.4.29
A Pd-catalyzed heteroannulation approach for the synthesis of C2 borylated indoles is reported. The process allows access to highly functionalized 2-borylated indole scaffolds with complete control of regioselectivity. The utility of the process is demonstrated in the synthesis of borylated sulfa drugs and in the concisesynthesis of the Aspidosperma alkaloid Goniomitine.