Remote C-H insertion of vinyl cations leading to cyclopentenones.

Remote C-H insertion of vinyl cations leading to cyclopentenones.
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DOI:
10.1039/c7sc02768k
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发表时间:
2017-10-01
期刊:
影响因子:
8.4
通讯作者:
Brewer M
Brewer M
中科院分区:
化学1区
文献类型:
--
作者:
Cleary SE;Hensinger MJ;Brewer M

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β-羟基-α-重氮酮与刘易斯酸反应生成的乙烯基阳离子发生1,2-位移和C-H插入,生成环戊烯酮产物。我们报道了一个刘易斯酸催化的反应序列,包括1,2-位移和随后的C-H插入,得到单环和稠合双环环戊烯酮产品。该反应序列通过用刘易斯酸处理β-羟基-α-重氮酮而引发,通过插入非活化γ C-H键的乙烯基阳离子中间体进行。该反应代表了利用分子内C-H插入中的重氮官能团的替代策略,并且可以提供过渡金属催化的C-H插入无法获得的产物。这种远程C-H活化方法提供了含有7-和8-元环的双环环戊烯酮产物和单环前列腺素类似物的良好产率。
Vinyl cations, generated by reacting β-hydroxy-α-diazo ketones with Lewis acids, undergo a 1,2-shift and C–H insertion to give cyclopentenone products. We report a Lewis acid catalyzed reaction sequence involving a 1,2-shift and subsequent C–H insertion that gives monocyclic and fused bicyclic cyclopentenone products. This reaction sequence, which is initiated by treating β-hydroxy-α-diazo ketones with a Lewis acid, proceeds through vinyl cation intermediates that insert at non-activated gamma C–H bonds. This reaction represents an alternative strategy to exploit the diazo functional group in an intramolecular C–H insertion, and can provide products not accessible by transition metal catalyzed C–H insertions. This remote C–H activation process provides good yields of bicyclic cyclopentenone products that contain 7- and 8-membered rings, and monocyclic prostaglandin analogs.
DOI: 10.1039/p19730000977
发表时间: 1973-01-01
期刊: JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1
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