Deuteration of Formyl Groups via a Catalytic Radical H/D Exchange Approach.

Deuteration of Formyl Groups via a Catalytic Radical H/D Exchange Approach.
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DOI:
10.1021/acscatal.9b05300
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发表时间:
2020-02-07
期刊:
影响因子:
12.9
通讯作者:
Wang W
Wang W
中科院分区:
化学1区
文献类型:
--
作者:
Zhang Y;Ji P;Dong Y;Wei Y;Wang W

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甲酰基处的H/D交换代表了获得C-1氘代醛的直接方法。这种转变最近已经通过过渡金属和NHC卡宾催化实现。从机理上讲,所有这些过程都涉及离子途径。在这里,我们报告了一个独特的光氧化还原催化,可见光介导的中性自由基的方法。当使用过量的D2 O时,在能垒可克服的可逆反应中选择性控制高反应性酰基自由基能够驱动氘代产物的形成。H/D交换过程的能力已经被证明不仅适用于芳香醛,而且适用于脂肪族底物,这在过渡金属催化的H/D交换反应中是困难的,并且适用于选择性后期氘掺入具有均匀高氘化水平(>90%)的复杂结构中。
H/D exchange at formyl groups represents the straightforward approach to C-1 deuterated aldehydes. This transformation has been recently realized by transition metal and NHC carbene catalysis. Mechanistically, all these processes involve an ionic pathway. Herein we report a distinct photoredox catalytic, visible light mediated neutral radical approach. Selective control of highly reactive acyl radical in the energy barrier surmountable, reversible reaction enables driving the formation of deuterated products when an excess of D2O is employed. The power of the H/D exchange process has been demonstrated for not only aromatic aldehydes, but also aliphatic substrates, which have been difficult in transitional metal catalyzed H/D exchange reactions, and for selective late-stage deuterium incorporation into complex structures with uniformly high deuteration level (>90%).
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