Native functionality in triple catalytic cross-coupling: sp³ C-H bonds as latent nucleophiles.

Native functionality in triple catalytic cross-coupling: sp³ C-H bonds as latent nucleophiles.
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DOI:
10.1126/science.aaf6635
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发表时间:
2016-06-10
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
MacMillan DW
MacMillan DW
中科院分区:
其他
文献类型:
--
作者:
Shaw MH;Shurtleff VW;Terrett JA;Cuthbertson JD;MacMillan DW

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SP3 C-H键--有机分子中普遍存在的--作为过渡金属催化的交叉偶联反应的潜在亲核等价物的使用,有可能在绕过底物活化步骤的同时,大大简化有机化学中的合成工作。通过结合光氧化还原介导的氢原子转移(HAT)和镍催化,我们开发了一种高选择性和通用的C-H芳基化协议,该协议激活了广泛的C-H键作为交叉偶联的天然功能手柄。这一温和的方法利用了可调的HAT催化剂,该催化剂根据焓和键极性的考虑显示了可预测的反应模式,在环状和非环状体系中选择性地使a-氨基和a-氧基SP3C-H键官能化。
The use of sp3 C–H bonds—which are ubiquitous in organic molecules—as latent nucleophile equivalents for transition metal–catalyzed cross-coupling reactions has the potential to substantially streamline synthetic efforts in organic chemistry while bypassing substrate activation steps. Through the combination of photoredox-mediated hydrogen atom transfer (HAT) and nickel catalysis, we have developed a highly selective and general C–H arylation protocol that activates a wide array of C–H bonds as native functional handles for cross-coupling. This mild approach takes advantage of a tunable HAT catalyst that exhibits predictable reactivity patterns based on enthalpic and bond polarity considerations to selectively functionalize a-amino and a-oxy sp3 C–H bonds in both cyclic and acyclic systems.
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