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.
Herein, we unveiled the novel approach for the synthesis of α-oxoketene S,S- and N,S-acetals employing a Mitsunobuprotocol. A wide range of alcohols has been successfully utilized, enabling great tolerability to this reaction. A diverse set of β-keto(dithioesters/thioamides) bearing various functional groups were found to be well suited substrates for this reaction, showing no obvious electronic effect
An efficient one-pot protocol for the solvent-free synthesis of novel quinoline-3-thiocarboxamide and 2,3-dihydroquinazolin-4(1H)-one derivatives
作者:Srikanth Reddy Narra、Sreenivas Avula、Ratnakar Reddy Kuchukulla、Jagadeesh B. Nanubolu、Narsaiah Banda、Rambabu Yadla
DOI:10.1016/j.tet.2017.06.047
日期:2017.8
An efficient and straightforward synthesis of a series of novel poly-substituted quinoline-3-thiocarboxamides 3 and 2-(2-oxo-2-arylethylidene)-2,3-dihydroquinazolin-4(1H)-ones 4 from 3-oxo-N,3-diarylpropanethioamide 1 and the respective 2-aminoarylketone/2-aminoarylcarboxylic acid ester 2 by a two-component solvent-free reaction protocol was described.
An efficient chemoselectivesynthesis of 1,3‐thiazine‐2‐ylidenes was achieved via annulations of β‐aroyl‐thioacetamide with propargyl alcohols using BF3 OEt2 as Lewis acid catalyst. A broad spectrum of substrates was well tolerated under the mild reaction conditions producing desired thiazine heterocyclics in good yields.
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