Copper-mediated fluorination of arylboronate esters. Identification of a copper(III) fluoride complex.

Copper-mediated fluorination of arylboronate esters. Identification of a copper(III) fluoride complex.
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DOI:
10.1021/ja310909q
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发表时间:
2013-02-20
影响因子:
15
通讯作者:
Hartwig, John F.
Hartwig, John F.
中科院分区:
化学1区
文献类型:
--
作者:
Fier, Patrick S.;Luo, Jingwei;Hartwig, John F.

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报道了一种在温和条件下,用易得的试剂将芳基硼酸酯直接转化为芳基氟的方法。通过芳基硼酸酯中间体的芳烃和芳基溴的缩合反应也已发展为串联反应。机理研究表明,这一反应发生,通过Cu(I),Cu(III),然后由限速transmethalide的绑定芳基硼酸铜(III)的轻松氧化。快速C-F还原消除提出发生从芳基铜(III)-氟化物配合物。Cu(III)中间体已经独立地产生并通过NMR光谱和ESI-MS鉴定。
A method for the direct conversion of arylboronate esters to aryl fluorides under mild conditions with readily available reagents is reported. Tandem reactions have also been developed for the fluorination of arenes and aryl bromides through aryl-boronate ester intermediates. Mechanistic studies suggest that this fluorination reaction occurs through facile oxidation of Cu(I) to Cu(III) followed by rate-limiting transmetallation of a bound arylboronate to Cu(III). Fast C-F reductive elimination is proposed to occur from an aryl-copper(III)-fluoride complex. Cu(III) intermediates have been generated independently and identified by NMR spectroscopy and ESI-MS.
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发表时间: 1966-01-01
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