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:
影响因子:
--
通讯作者:
Hoveyda AH
中科院分区:
文献类型:
--
作者:
Nguyen TT;Koh MJ;Shen X;Romiti F;Schrock RR;Hoveyda AH
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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