Kinetically controlled E-selective catalytic olefin metathesis.

Kinetically controlled E-selective catalytic olefin metathesis.
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DOI:
10.1126/science.aaf4622
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发表时间:
2016-04-29
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Hoveyda AH
Hoveyda AH
中科院分区:
其他
文献类型:
--
作者:
Nguyen TT;Koh MJ;Shen X;Romiti F;Schrock RR;Hoveyda AH

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烯烃复合反应是一个化学过程,是几个化学分支研究的中心,在产品分布中缺乏有效的动力学方法有利于e -异构体。在这里,我们表明,可以设计动力学e选择性交叉转化反应,以高产率和优异的立体选择性生成热力学上不利的烯酰氯和氟化物。使用1.0-5.0 mol %的钼基催化剂,可以以空气和湿稳定的石蜡丸的形式输送,在室温下,反应通常在4小时内完成。许多异构纯的e -烯酰氯,适用于催化交叉偶联转化,并在生物活性实体中发现,因此变得容易和直接获取。类似地,e -烯基氟化物可以由更简单的化合物或更复杂的分子合成。
A significant shortcoming in olefin metathesis, a chemical process that is central to research in several branches of chemistry, is the lack of efficient methods that kinetically favor E-isomers in the product distribution. Here, we show that kinetically E-selective cross-metathesis reactions may be designed to generate thermodynamically disfavored alkenyl chlorides and fluorides in high yield and with exceptional stereoselectivity. With 1.0–5.0 mol % of a molybdenum-based catalyst, which may be delivered in the form of air- and moisture-stable paraffin pills, reactions typically proceed to completion within four hours at ambient temperature. Many isomerically pure E-alkenyl chlorides, applicable to catalytic cross-coupling transformations and found in biologically active entities, thus become easily and directly accessible. Similarly, E-alkenyl fluorides can be synthesized from simpler compounds or more complex molecules.
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