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
with coppercomplexes as catalysts. The reactions involve iminyl-radical-mediated intramolecular hydrogen atom transfer as the key step, with the iminyl radicals being generated via copper-effected N–O cleavage. The reaction afforded 3,4-dihydro-2H-pyrroles under the conditions of [Cu(DPEphos)(bcp)]PF6 and DABCO, while γ-pentafluorobenzoyloxy ketones were produced predominantly when [Cu(dpp)2]PF6 and
The nickel-catalyzed three-component reductive carbonylation of alkylhalides, aryl halides, and ethyl chloroformate is described. The use of ethyl chloroformate as a safe and readily available source of CO provides an efficient and practical alternative for the synthesis of aryl-alkyl ketones.
描述了烷基卤化物、芳基卤化物和氯甲酸乙酯的镍催化三组分还原羰基化。使用氯甲酸乙酯作为一种安全且容易获得的 CO 来源,为芳基烷基酮的合成提供了一种有效且实用的替代方案。
Nickel-Catalyzed Highly Selective Reductive Carbonylation Using Oxalyl Chloride as the Carbonyl Source
作者:Jiannan Wang、Yuqing Yin、Xiaoqian He、Qiao-Lian Duan、Ruopeng Bai、Hai-Wei Shi、Renyi Shi
DOI:10.1021/acscatal.3c01090
日期:2023.6.16
available chemical, is one of the most versatile organic reagents used in chemical reactions. In this work, high chemoselectivity can be achieved with a 1:1:1 ratio of Ar–I to alkyl-I to oxalyl chloride. A wide range of alkyl aryl ketones which present an important class of molecules in synthetic and medicinal chemistry are accessed from alkyl halides, aryl iodides, under mild conditions. Primary and secondary
Nickel-catalyzed reductive coupling of arylcarboxylic acid 2-pyridyl esters with alkyl methanesulfonates: access to alkyl aryl ketones
作者:Hang Yu、Zhong-Xia Wang
DOI:10.1039/d3ob00293d
日期:——
Alkyl aryl ketones were synthesized via a nickel-catalyzed reductive coupling reaction of arylcarboxylic acid (2-pyridyl)esters with primary and secondary alkylmethanesulfonates under mild reaction conditions. This method suits a wide range of substrates and shows good compatibility with functional groups.