<i>p</i>-Silylation of Arenes via Organic Photoredox Catalysis: Use of <i>p</i>-Silylated Arenes for Exclusive <i>o</i>-Silylation, <i>o</i>-Acylation, and <i>o</i>-Alkylation Reactions
Photocatalytic regiospecific p-silylation of arenes has been achieved by the coupling of in situ generated silyl radical with areneradicalcation. The strategy involves reductive activation of PhSe–SiR3 and single electron transfer from the electron rich arene to 9,10-dimethoxyanthracene radicalcation (DMA•+). p-Silyl arenes, thus formed, are further utilized for exclusive o-silylation reaction and
Synthesis of selenol esters via the reaction of acyl chlorides with diselenides in the presence of Zn dust catalyzed by CoCl2·6H2O
作者:Angélica J. de Oliveira、Sandynara A. de Oliveira、Leonardo G. Vasconcelos、Evandro L. Dall'Oglio、Lucas C.C. Vieira、André L. Stein
DOI:10.1016/j.tetlet.2021.153317
日期:2021.9
A practical and efficient approach for the synthesis of selenol and thiol esters is described via the reaction of acyl chlorides with diselenides or disulfides in the presence of Zn dust catalyzed by inexpensive CoCl2·6H2O This protocol tolerates a wide range of substrates, including aromatic and aliphatic acyl chlorides, with a variety of sensitive functional groups to afford the respective products