Synthesis of Substituted 4<i>H</i>-Thiochromen-4-imines via Copper-Catalyzed Cyclization Cascades of <i>o</i>-Bromobenzothioamides with Terminal Alkynes
作者:Yong-Gang Ma、Meng-Qiao Huang、Zhenhua Liu、Jian-Quan Liu、Xiang-Shan Wang
DOI:10.1021/acs.joc.8b01180
日期:2018.8.17
A series of (E)-N-aryl-4H-thiochromen-4-imines has been conveniently obtained through a cascade reaction between o-bromobenzothioamides and terminalalkynes. This novel approach probably involved an initial generation of benzothietane-2-imine intermidates via an intramolecular Ullmann reaction under CuI/L-proline cocatalysis and alkaline conditions followed by imine alkynylation, ring opening, and
A novel method for the metal-free synthesis of amides from thioamides based on visible-light photoredox catalysis and in an air atmosphere is reported. Natural pigment chlorophyll is used as a photosensitizer to generate singlet molecular oxygen 1O2, which is involved in the aerobic desulfurization of thioamides. The protocol provides amides in good yields at room temperature under mild conditions
报道了一种基于可见光光氧化还原催化和空气气氛的硫代酰胺无金属合成酰胺的新方法。天然色素叶绿素作为光敏剂产生单线态分子氧1 O 2,参与硫代酰胺的好氧脱硫。该协议在温和条件下在室温下以良好的收率提供酰胺。在实验结果的基础上,提出了一种合理的光氧化还原机制。
Investigating the Potency of a Phenalenyl-Based Photocatalyst under the Photoelectrochemical Condition for Intramolecular C–S Bond Formation
作者:Partha Pratim Sen、Nayan Saha、Sudipta Raha Roy
DOI:10.1021/acscatal.3c05500
日期:2024.1.19
phenalenyl-based organic photocatalyst toward photoelectrochemical intramolecular C–S bond construction reactions under mild conditions. This phenalenyl core, which contains a vacant NBMO, acts as an electron reservoir, thereby facilitating the formation of a contact ion pair with electron-rich organic systems through intramolecular electron transfer under photoexcitation and aiding in catalytic regeneration