Herein, a donor/acceptor-free carbene insertionreaction of an S–S bond through a radical process is presented. This catalyst-free reaction was thermally induced and provided the dithioketal products in moderate to high yields. A mechanism involving radical intermediates was proposed according to the computationalstudy, and these intermediates were verified experimentally and intercepted for the first
Highly <i>para-</i>selective C‒H alkylation of unactivated arenes with α-aryl-α-diazoesters catalyzed by gold(I) immobilized on MCM-41
作者:Yingying Du、Fang Yao、Mingzhong Cai
DOI:10.1177/1747519819893878
日期:2020.3
The heterogeneous gold(I)-catalyzed highly para-selective C(sp2)–H bond alkylation of benzene derivatives with α-aryl-α-diazoesters possessing electron-withdrawing substituents on the aryl rings are achieved. The reactions proceed undermildconditions in good to excellent yields by using an MCM-41-anchored diphenylphosphine gold(I) complex [MCM-41-PPh2-AuOTf] as a recyclable catalyst.
Copper-Catalyzed 1,1-Boroalkylation of Terminal Alkynes: Access to Alkenylboronates via a Three-Component Reaction
作者:Ziyong Li、Jiangtao Sun
DOI:10.1021/acs.orglett.1c01081
日期:2021.5.7
A copper-catalyzed three-component reaction of terminal alkynes, diazo compounds, and B2pin2 to prepare trisubstituted alkenylboronates has been developed. This difunctionalization of alkynes selectively occurs at the terminal carbon atom and proceeds via a tandem sequence. The copper catalyst plays dual roles in the whole process, namely, the initial copper-catalyzed cross-coupling and the following
Gold‐Catalyzed Formal [4+1]/[4+3] Cycloadditions of Diazo Esters with Triazines
作者:Chenghao Zhu、Guangyang Xu、Jiangtao Sun
DOI:10.1002/anie.201606139
日期:2016.9.19
gold‐catalyzed formal [4+1]/[4+3] cycloadditions of diazo esters with hexahydro‐1,3,4‐triazines, thus providing five‐ and seven‐membered heterocycles in moderate to high yields under mild reaction conditions. These reactions feature the use of a gold complex to accomplish the diverse annulations and the first example of the involvement of a gold metallo‐enolcarbene in a cycloaddition. It is also the