Hydrodealkenylative C(sp
<sup>3</sup>
)–C(sp
<sup>2</sup>
) bond fragmentation
作者:Andrew J. Smaligo、Manisha Swain、Jason C. Quintana、Mikayla F. Tan、Danielle A. Kim、Ohyun Kwon
DOI:10.1126/science.aaw4212
日期:2019.5.17
681; see also p. 635 Cleavage of the bond between saturated and double-bonded carbons by ozone and iron can diversify abundant natural products. Chemical synthesis typically relies on reactions that generate complexity through elaboration of simple starting materials. Less common are deconstructive strategies toward complexity—particularly those involving carbon-carbonbond scission. Here, we introduce
去除烯烃 植物产生大量结构复杂的萜烯化合物,这些化合物是药物和其他精细化学品的有用前体。然而,这些化合物的碳骨架限制了可用的多样化途径。斯马利戈等人。现在表明,用臭氧、铁氧化剂和氢原子供体连续处理可以从萜烯和相关化合物中干净地裂解悬垂的烯烃(参见 Caille 的观点)。打破饱和和双键碳中心之间的键提供了从容易获得的廉价前体中获得理想手性中间体的直接途径。科学,这个问题 p。681;另见 p. 635 臭氧和铁对饱和碳和双键碳之间的键的裂解可以使丰富的天然产物多样化。化学合成通常依赖于通过精制简单起始材料而产生复杂性的反应。不太常见的是针对复杂性的解构策略——尤其是那些涉及碳-碳键断裂的策略。在这里,我们介绍了一种这样的转化:C(sp3)–C(sp2) 键的加氢脱烯基裂解,在室温以下进行,使用臭氧、铁盐和氢原子供体。这些反应在非无水溶剂中进行,并向空气开放;30分钟内完成;并以高产量交付他
A stereoselective total synthesis of (−)-seychellene
作者:A. Srikrishna、G. Ravi
DOI:10.1016/j.tet.2008.01.035
日期:2008.3
A stereoselective totalsynthesis of the tricyclic sesquiterpene (−)-seychellene, starting from (R)-carvone via (R)-3-methylcarvone has been accomplished, employing a combination of intermolecular Michael addition–intramolecular Michael addition sequence, a stereoselective hydrogenation, and an intramolecular alkylation reaction.