Surgical Cleavage of Unstrained C(
<i>sp</i>
<sup>3</sup>
)−C(
<i>sp</i>
<sup>3</sup>
) Bonds in General Alcohols for Heteroaryl C−H Alkylation and Acylation
作者:Yaxin Wang、Le Yang、Shuai Liu、Lixia Huang、Zhong‐Quan Liu
DOI:10.1002/adsc.201900975
日期:2019.10.8
We reported herein a predictable and surgicalcleavage of carbon‐carbon bond in alcohols. A wide range of 1°, 2° and 3° alcohols including sugars and steroids without ring strain or steric hindrance were all compatible with this system. Also it offered a green and practical strategy for generation of alkyl/acyl radicals using alcohols as the sources. Besides, the features of visible‐light‐initiation
Flow Synthesis of Iodonium Trifluoroacetates through Direct Oxidation of Iodoarenes by Oxone®
作者:Natalia S. Soldatova、Pavel S. Postnikov、Mekhman S. Yusubov、Thomas Wirth
DOI:10.1002/ejoc.201900220
日期:2019.3.14
Flow chemistry is considered to be a versatile and complementary methodology for the preparation of valuable organic compounds. We describe a straightforwardapproach for the synthesis of iodonium trifluoroacetates through the direct oxidation of iodoarenes in a simple flow reactor using an Oxone‐filled cartridge. Optimization has been carried out using the Nelder–Mead algorithm. The procedure allows
Direct C–H α-Arylation of Enones with ArI(O<sub>2</sub>CR)<sub>2</sub> Reagents
作者:Felipe Cesar Sousa e Silva、Nguyen T. Van、Sarah E. Wengryniuk
DOI:10.1021/jacs.9b11282
日期:2020.1.8
mediated by hypervalent iodine reagents. The reaction proceeds via a reductive iodonium Claisen rearrangement of in situ β-pyridinium silyl enol ethers. The aryl groups are derived from ArI(O2CCF3)2 reagents, which are readily accessed from the parent iodoarenes. It is tolerant of a wide range of substitution patterns and the incorporated arenes maintain the valuable iodine functional handle. Mechanistic
C−H Oxygenation Reactions Enabled by Dual Catalysis with Electrogenerated Hypervalent Iodine Species and Ruthenium Complexes
作者:Leonardo Massignan、Xuefeng Tan、Tjark H. Meyer、Rositha Kuniyil、Antonis M. Messinis、Lutz Ackermann
DOI:10.1002/anie.201914226
日期:2020.2.17
The catalytic generation of hypervalent iodine(III) reagents by anodic electrooxidation was orchestrated towards an unprecedented electrocatalytic C−H oxygenation of weakly coordinating aromatic amides and ketones. Thus, catalytic quantities of iodoarenes in concert with catalytic amounts of ruthenium(II) complexes set the stage for versatile C−H activations with ample scope and high functional group
Alternative Strategies with Iodine: Fast Access to Previously Inaccessible Iodine(III) Compounds
作者:Tobias Hokamp、Leonardo Mollari、Lewis C. Wilkins、Rebecca L. Melen、Thomas Wirth
DOI:10.1002/anie.201804642
日期:2018.7.2
conditions by using iodine triacetates as reagents. The oxidative step is decoupled from the synthesis of hypervalentiodine(III) reagents, which can now be prepared conveniently in a one‐pot synthesis for subsequent reactions without prior purification. The chemistry of iodine triacetates was also expanded to heteroatom ligand exchanges to form novel inorganic hypervalentiodine compounds.