organic photocatalyst, and we describe a robust method for the directC(sp3)–H carbamoylation of saturated aza-heterocycles under mild conditions by using a naphthalimide (NI)-based organic photocatalyst. This protocol provides a concise and practical approach for the rapid installation of a valuable amide bond onto pharmaceutically useful saturated aza-heterocycles to access a wide range of cyclic α-amino
Amination of Aryl Halides Mediated by Electrogenerated Nickel from Sacrificial Anode
作者:Farah Daili、Stéphane Sengmany、Eric Léonel
DOI:10.1002/ejoc.202100194
日期:2021.5.7
C(sp2)−N bond formation only mediated by nickel salts electrogenerated from the sacrificial anode has been investigated for the first time to prepare functionalized arylamine derivatives. The cross‐couplings are performed under constant current electrolysis, in an undivided cell, and without additional ligand at room temperature.
General Paradigm in Photoredox Nickel‐Catalyzed Cross‐Coupling Allows for Light‐Free Access to Reactivity
作者:Rui Sun、Yangzhong Qin、Daniel G. Nocera
DOI:10.1002/anie.201916398
日期:2020.6.8
Self‐sustained NiI/III cycles are established as a potentially generalparadigm in photoredox Ni‐catalyzed carbon–heteroatom cross‐coupling reactions through a strategy that allows us to recapitulate photoredox‐like reactivity in the absence of light across a wide range of substrates in the amination, etherification, and esterification of aryl bromides, the latter of which has remained, hitherto, elusive
自我维持的Ni I / III循环被确立为光氧化还原Ni催化的碳-杂原子交叉偶联反应中的潜在一般范式,其策略是使我们能够在没有光的情况下在各种各样的底物上重现类似光氧化还原的反应性。在芳基溴化物的胺化,醚化和酯化反应中,迄今为止,后者在热镍催化下仍然难以捉摸。此外,在没有光照的情况下酯化的可及性尤其显着,因为先前在光氧化还原条件下对该转化进行的机理研究一致地调用了能量转移介导的途径。
Practical heterogeneous photoredox/nickel dual catalysis for C–N and C–O coupling reactions
Efficient C–N and C–Ocouplingreactions of aryl halides with amines and alcohols have been developed by using the strategy of heterogeneous visible light photoredox and nickel dual catalysis. Obviously, the joint use of inexpensive and bench-stable CdS and nickel salts, together with mild reaction conditions, makes these two transformations attractive for the synthetic community. This heterogeneous
Strongly Reducing, Visible‐Light Organic Photoredox Catalysts as Sustainable Alternatives to Precious Metals
作者:Ya Du、Ryan M. Pearson、Chern‐Hooi Lim、Steven M. Sartor、Matthew D. Ryan、Haishen Yang、Niels H. Damrauer、Garret M. Miyake
DOI:10.1002/chem.201702926
日期:2017.8.16
Photoredox catalysis is a versatile approach for the construction of challenging covalent bonds under mild reaction conditions, commonly using photoredox catalysts (PCs) derived from precious metals. As such, there is need to develop organic analogues as sustainable replacements. Although several organic PCs have been introduced, there remains a lack of strongly reducing, visible-light organic PCs