Phenylglyoxylic Acid: An Efficient Initiator for the Photochemical Hydrogen Atom Transfer C−H Functionalization of Heterocycles
作者:Giorgos N. Papadopoulos、Maroula G. Kokotou、Nikoleta Spiliopoulou、Nikolaos F. Nikitas、Errika Voutyritsa、Dimitrios I. Tzaras、Nikolaos Kaplaneris、Christoforos G. Kokotos
DOI:10.1002/cssc.202001892
日期:2020.11.20
C−H functionalization at the α‐position of heterocycles has become a rapidly growing area of research. Herein, a cheap and efficient photochemical method was developed for the C−H functionalization of heterocycles. Phenylglyoxylic acid (PhCOCOOH) could behave as an alternative to metal‐based catalysts and organic dyes and provided a very general and wide array of photochemical C−H alkylation, alkenylation
Site‐Selective C(
<i>sp</i>
<sup>3</sup>
)‐H Alkenylation Using Decatungstate Anion as Photocatalyst
作者:Yi‐Ting Wang、Yi‐Lun Shih、Yen‐Ku Wu、Ilhyong Ryu
DOI:10.1002/adsc.202101374
日期:2022.3
Site-selective C(sp3)-H alkenylation was achieved under photo-irradiation in the presence of a catalytic amount of decatungstateanion, W10O324−. In this reaction, the radical addition/β-scission sequence is successfully combined with photocatalytic C(sp3)-H functionalization. The reaction using weaker C−H bonds such as those in THF revealed that the benzenesulfonyl radical itself underwent HAT directly