Synthesis of disulfides tethered pyrroles from β-ketothioamides via a bicyclization/ring-opening/oxidative coupling reaction
作者:Cong-Xiang Li、Rui-Juan Liu、Kun Yin、Li-Rong Wen、Ming Li
DOI:10.1039/c7ob00655a
日期:——
A DABCO-promoted three-component reaction of β-ketothioamides (KTAs), arylglyoxals and 2-cyanoacetates to access disulfides tethered pyrroles by air as oxidant has been disclosed. Importantly, this protocolinvolves a tandem sequence that includes Knoevenagel condensation, Michaeladdition, N-cyclization, O-cyclization, ring-opening and oxidative coupling.
Switching Regioselectivity of β-Ketothioamides by Means of Iodine Catalysis: Synthesis of Thiazolylidenes and 1,4-Dithiines
作者:Li-Rong Wen、Lian-Bin Men、Tao He、Guo-Jing Ji、Ming Li
DOI:10.1002/chem.201304497
日期:2014.4.22
An efficient I2‐catalyzed synthesis of thiazolylidenes and 1,4‐dithiines from β‐ketothioamides (KTAs) has been developed by only controlling the amount of I2 that triggers different cascade reaction sequences by means of [3+2] or [3+3] cyclocondensation in a one‐step process. A possible mechanistic proposal for these transformations is presented.
Electrochemical Selective Oxidative Synthesis of Diversified Sulfur Heterocycles from
<scp>β‐Ketothioamides</scp>
作者:Li‐Rong Wen、Ning‐Ning Wang、Wu‐Bo Du、Ming‐Zhe Zhu、Chao Pan、Lin‐Bao Zhang、Ming Li
DOI:10.1002/cjoc.202100132
日期:2021.7
diversified sulfurheterocycles has been described through organic electrosynthesis means. In undivided cell, dihydrothiophenes, thiazolines and 1,4-dithiines could be easily generated from various available β-ketothioamides under metal-free and external oxidant-free conditions. The transformation underwent smoothly under mild conditions and could be easily scaled-up. Moreover, different sulfur heterocycles
Three-Component Cascade Annulation of β-Ketothioamides Promoted by CF<sub>3</sub>CH<sub>2</sub>OH: A Regioselective Synthesis of Tetrasubstituted Thiophenes
作者:Li-Rong Wen、Tao He、Ming-Chao Lan、Ming Li
DOI:10.1021/jo401397d
日期:2013.11.1
A rapid and highly efficient method for the regioselective synthesis of thiophene derivatives has been developed by annulation of β-ketothioamides with arylglyoxals and 5,5-dimethyl-1,3-cyclohexanedione in CF3CH2OH within 15 min. The present synthesis has several desirable features, such as high regioselectivity, a concise one-pot protocol, short reaction time, and easy purification. This methodology
A tandem reaction of 2-acetylmethylene-1,3-dithiolanes via fragmentation of the dithiolane ring in the presence of amines: a facile route to functionalized thioamides
作者:Fushun Liang、Yan Li、Dazhi Li、Xin Cheng、Qun Liu
DOI:10.1016/j.tetlet.2007.09.065
日期:2007.11
A facile and efficient route to functionalized thioamides has been developed by a tandem reaction of 2-acetylmethylene-1,3-dithiolanes via fragmentation of the dithiolane ring upon heating and in the presence of an amine.