Copper(1) catalysed aromatic nucleophilic substitution: A mechanistic and synthetic comparison with the SRN1 reaction
作者:W.Russell Bowman、Harry Heaney、Philip H.G. Smith
DOI:10.1016/s0040-4039(01)81695-6
日期:1984.1
Evidence is provided to support a mechanism for Cu(1) catalysed aromatic nucleophilic substitution via inner-sphere electron-transfer and a Cu(111) intermediate, and to show the synthetic potential for Cu(1) catalysis relative to the SRN1reaction.
Electrochemical Intramolecular Dehydrogenative Coupling of <i>N</i>
-Benzyl(thio)amides: A Direct and Facile Synthesis of 4<i>H</i>
-1,3-Benzoxazines and 4<i>H</i>
-1,3-Benzothiazines
作者:Hui Yu、Mingdong Jiao、Ruohe Huang、Xiaowei Fang
DOI:10.1002/ejoc.201801021
日期:2019.3.14
Intramolecular dehydrogenative coupling of N‐benzylamides and thioamides was investigated under electrolysis conditions and 4H‐1,3‐benzoxazines and 4H‐1,3‐benzothiazine were obtained in moderate to good yields in CH3CN at room temperature.
Intramolecular dehydrogenative C–S bond coupling of thioamides to form 1,3-benzothiazines under metal-free conditions
作者:Li-Rong Wen、Cheng-Cheng Zhou、Ming-Zhe Zhu、Shu-Guang Xie、Wei-Si Guo、Ming Li
DOI:10.1039/c9ob00237e
日期:——
coupling reaction of thioamides has been developed to provide 1,3-benzothiazine derivatives in good yields. The reaction proceeds smoothly to reach completion at room temperature within 1 min under metal-free conditions. This protocol provides a mild and efficient strategy for the synthesis of six-membered N,S-containing heterocycles. Preliminary mechanistic studies indicate that a spirocyclic intermediate
Synthesis of 1,3-benzothiazines by intramolecular dehydrogenative C–S cross-coupling in a flow electrolysis cell
作者:Chong Huang、Hai-Chao Xu
DOI:10.1007/s11426-019-9554-1
日期:2019.11
Dehydrogenative cyclization of thioamides is an attractive approach for the synthesis of S-heterocycles. Reported herein is an electrochemical dehydrogenative cyclization reaction of N-benzyl thioamides in a flow electrolysis cell. The continuous-flow electrosynthesis has addressed the limitations associated with previously reported methods for the cyclization of alkylthioamides and provide a transition metal- and oxidizing reagent-free access to various functionalized 1,3-benzothiazines in good yields.