Catalytic activation of unstrained C(aryl)-C(aryl) bonds in 2,2'-biphenols.

Catalytic activation of unstrained C(aryl)-C(aryl) bonds in 2,2'-biphenols.
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DOI:
10.1038/s41557-018-0157-x
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发表时间:
2019-01
期刊:
影响因子:
21.8
通讯作者:
Dong G
Dong G
中科院分区:
化学1区
文献类型:
--
作者:
Zhu J;Wang J;Dong G

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过渡金属催化剂已经成为C-C活化的重要手段,允许温和和选择性的转变。然而,目前可以活化的C-C键的范围主要限于高度应变的系统或更极化的C-C键。相反,非极性和未应变的C-C部分的催化活化仍然是一个未满足的挑战。本文报道了2,2 ′-联苯酚中未受张力的C(芳基)-C(芳基)键的催化活化的一般方法。关键是利用苯酚部分作为手柄来安装次膦酸酯作为可回收的导向基团。以氢气为还原剂,以较低的催化剂负载量和较高的官能团耐受性得到单酚。这种方法也被应用于2,3,4-三取代苯酚的合成。进一步的机理研究表明,C-C活化步骤是由铑(I)一氢化物物种介导的。最后,对木质素模型中惰性双酚部分的断裂进行了初步研究。
Transition-metal catalysis has emerged as an important means for C-C activation allowing mild and selective transformations. However, the current scope of C-C bonds that can be activated is primarily restricted to either highly strained systems or more polarized C-C bonds. In contrast, catalytic activation of nonpolar and unstrained C-C moieties remains an unmet challenge. Here we report a general approach for catalytic activation of the unstrained C(aryl)-C(aryl) bonds in 2,2’-biphenols. The key is utilizing the phenol moiety as a handle to install phosphinites as a recyclable directing group. Using hydrogen gas as the reductant, mono-phenols are obtained with a low catalyst loading and high functional group tolerance. This approach has also been applied to the synthesis of 2,3,4-trisubstituted phenols. Further mechanistic study suggests that the C-C activation step is mediated by a rhodium(I) mono-hydride species. Finally, a preliminary study on breaking the inert biphenolic moieties in lignin models is illustrated.
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