Phenolate Enabled General and Selective Fe/Ti Cocatalyzed Biaryl Cross-Couplings between Aryl Halides and Aryl Grignard Reagents.

Phenolate Enabled General and Selective Fe/Ti Cocatalyzed Biaryl Cross-Couplings between Aryl Halides and Aryl Grignard Reagents.
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酚盐可实现芳基卤化物和芳基格氏试剂之间的通用和选择性 Fe/Ti 助催化联芳基交叉偶联。

DOI:
10.1021/acs.orglett.8b03513
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发表时间:
2018-12
期刊:
Org Lett
影响因子:
--
通讯作者:
Duan Xin-Fang
Duan Xin-Fang
中科院分区:
其他
文献类型:
--
作者:
Zhang Rui;Zhao Yan;Liu Kun-Ming;Duan Xin-Fang

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酚盐的偶然添加到FeCl 3/TMEDA/Ti(OEt)4实现了强的Fe/Ti协同性,其可以有效地催化一般的和选择性的联芳基偶联反应。在不存在膦或NHC配体的情况下,各种芳基氯化物、溴化物和碘化物可以与各种常见的和Knochel型芳基格氏试剂偶联。可以容许任一偶联配偶体中的广泛的敏感官能团。这种双金属催化不仅大大扩展了铁催化联芳偶联反应的范围,而且解决了格氏试剂官能团相容性的问题。
The serendipitous addition of a phenolate to FeCl3/TMEDA/Ti(OEt)4 enables a strong Fe/Ti cooperativity that can efficiently catalyze a general and selective biaryl-coupling reaction. In the absence of phosphine or NHC ligands, various aryl chlorides, bromides, and iodides can couple with a variety of common and Knochel-type aryl Grignard reagents. A wide range of sensitive functional groups in either coupling partner can be tolerated. This bimetallic cocatalysis not only remarkably extends the scope of Fe-catalyzed biaryl couplings but also provides a solution to the problem of functional group compatibility of Grignard reagents.
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