α-Aminoxy-Acid-Auxiliary-Enabled Intermolecular Radical γ-C(sp<sup>3</sup>
)−H Functionalization of Ketones
作者:Heng Jiang、Armido Studer
DOI:10.1002/anie.201712066
日期:2018.2.5
site‐specific intermolecular γ‐C(sp3)−H functionalization of ketones has been developed using an α‐aminoxy acid auxiliary applying photoredox catalysis. Regioselective activation of an inert C−H bond is achieved by 1,5‐hydrogen atom abstraction by an oxidatively generated iminyl radical. Tertiary and secondary C‐radicals thus formed at the γ‐position of the imine functionality undergo radicalconjugate addition
Iminyl Radical-Mediated Controlled Hydroxyalkylation of Remote C(<i>sp</i>
<sup>3</sup>
)-H Bond via Tandem 1,5-HAT and Difunctionalization of Aryl Alkenes
A visible‐lightmediated γ‐hydroxyalkylation of ketones via C(sp3)‐H functionalization has been developed under redox neutral conditions. This protocol relies on the iminyl radical‐triggered 1,5‐HAT followed by oxyalkylation of alkenes, wherein C−C and C−O bonds were constructed in one step. This three‐component reaction features mild conditions, wide substrate scope and excellent functional group
Carbonylation of tertiary carbon radicals: synthesis of lactams
作者:Zhiping Yin、Zhuan Zhang、Youcan Zhang、Pierre H. Dixneuf、Xiao-Feng Wu
DOI:10.1039/c9cc02112d
日期:——
Herein, we disclose an interesting iron-catalyzed approach for the carbonylation of a tertiary carbon radical. The tertiary carbon radical generated from a 1,5-hydrogen atom transfer can be captured by CO gas smoothly. Various six-membered lactams were constructed chemo-selectively in high yields.
An efficient iron-catalyzed intermolecular remote C(sp3)–H heteroarylation of alkyl ketones has been developed via an iminyl radical-triggered 1,5-hydrogen-atom transfer (HAT) cascade. This protocol was amenable to a wide variety of alkyl ketones and heteroaryls, thus providing a straightforward method for the late-stage functionalization of alkylketones and heteroaryls.
Iron‐Catalysed Remote C(sp
<sup>3</sup>
)−H Azidation of
<i>O</i>
‐Acyl Oximes and
<i>N</i>
‐Acyloxy Imidates Enabled by 1,5‐Hydrogen Atom Transfer of Iminyl and Imidate Radicals: Synthesis of γ‐Azido Ketones and β‐Azido Alcohols
作者:Rubén O. Torres‐Ochoa、Alexandre Leclair、Qian Wang、Jieping Zhu
DOI:10.1002/chem.201901079
日期:2019.7.17
acetylacetonate [Fe(acac)3], the reaction of structurally diverse ketoxime esters with trimethylsilyl azide (TMSN3) afforded γ‐azido ketones in good to excellent yields. This unprecedented distal γ‐C(sp3)−H bond azidation reaction went through a sequence of reductive generation of an iminyl radical, 1,5‐hydrogen atom transfer (1,5‐HAT) and iron‐mediated redox azido transfer to the translocated carbon radical