Pd-Catalyzed Triple-Fold C(sp<sup>2</sup>)–H Activation with Enaminones and Alkenes for Pyrrole Synthesis via Hydrogen Evolution
作者:Leiqing Fu、Yunyun Liu、Jie-Ping Wan
DOI:10.1021/acs.orglett.1c01301
日期:2021.6.4
The synthesis of NH-free pyrroles via Pd-catalyzed annulation of enaminones and alkenes is reported. With the catalysis of Pd(II), the activation of triple C(sp2)–H bonds, including one internal C(sp2)–H bond in enaminone, has been activated to provide various pyrroles. The interesting evolution of hydrogen gas from the reactions has been observed by a hydrogen detector.
3-Z-5-(Q-CO)-6-methyl-2(1H)-pyridinones (I) or salts thereof, where Q is 2(or 3)-furanyl or 2(or 3)-thienyl when Z is hydrogen or cyano, or where Q is 4(or 3)-pyridinyl or 4(or 3)-pyridinyl having one or two methyl substituents only when Z is cyano, are useful as cardiotonic agents. Processes for preparing said compounds (I) are shown.
Rongalite as C1 Synthon in the Synthesis of Divergent Pyridines and Quinolines
作者:Huan Gao、Liyun Zhou、Jie-Ping Wan、Yunyun Liu
DOI:10.1021/acs.joc.3c00428
日期:2023.6.2
Rongalite has been used as a cheap and efficient carbon synthon for the synthesis of divergent N-heteroaromatics, including different pyridines and quinolines. The selective synthesis of different products can be achieved by employing enaminones or enaminones/anilines as reaction partners. In addition, compared with the reaction using conventional aldehyde synthons, rongalite displays an evident advantage
Electrochemical Enaminone-Thioamide Annulation and Thioamide Dimeric Annulation for the Tunable Synthesis of Thiazoles and 1,2,4-Thiadiazole
作者:Qihui Huang、Jianchao Liu、Jie-Ping Wan
DOI:10.1021/acs.orglett.4c01532
日期:2024.6.28
A green and sustainable electrochemical oxidative cyclization of enaminones with thioamides under metal- and oxidant-free conditions has been developed, providing an efficient approach for thiazole synthesis. Furthermore, 1,2,4-thiadiazoles can be selectively accessed via the electrochemical dimerization of thioamides in the absence of enaminones.