The first total synthesis of (-)-crinipellin A is described. The tetraquinane core skeleton of crinipellin A was assembled through the tandem [2 + 3] cycloaddition reaction of an allenyl diazo substrate containing a cyclopentane ring in a single operation. The absolute stereochemistry was confirmed through the total synthesis.
Total Syntheses of Crinipellins Enabled by Cobalt‐Mediated and Palladium‐Catalyzed Intramolecular Pauson–Khand Reactions
作者:Zhihui Huang、Jun Huang、Yongzheng Qu、Weibin Zhang、Jianxian Gong、Zhen Yang
DOI:10.1002/anie.201805143
日期:2018.7.9
compounds (−)‐crinipellin A and (−)‐crinipellin B are described. The key advanced intermediate, a fully functionalized tetraquinane core, was constructed by a novel thiourea/palladium‐catalyzed Pauson–Khandreaction. This intermediate can serve as a common intermediate for the collective total synthesis of other members of the crinipellin family.
A hydrogen atom transfer (HAT)-initiated Dowd–Beckwith rearrangement reaction was developed, which enables the efficient assembly of diversely functionalized polyquinane frameworks. By incorporation of an iridium-catalyzed regio- and enantioselective hydrogenation and a diastereocontrolled ODI-[5+2] cycloaddition/pinacolrearrangement cascade reaction, the asymmetric total syntheses of eight tetraquinane
作者:Taek Kang、Seog Boem Song、Won-Yeob Kim、Byung Gyu Kim、Hee-Yoon Lee
DOI:10.1021/ja5054412
日期:2014.7.23
The first total synthesis of (-)-crinipellin A is described. The tetraquinane core skeleton of crinipellin A was assembled through the tandem [2 + 3] cycloaddition reaction of an allenyl diazo substrate containing a cyclopentane ring in a single operation. The absolute stereochemistry was confirmed through the total synthesis.