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
One-pot two-component tandem multiple transformations in the synthesis of N,4-diaryl-2,3-dihydropyrrolo[3,4-c]quinolin-1,3-diones and their 3-thioxo-analogues under neat conditions
An efficient and exclusive synthesis of a decent library of hitherto unknown N,4-diaryl-3-thioxo-2,3-dihydropyrrolo[3,4-c]quinolin-1-ones by a one-pot two-component cascadereaction protocol undersolvent-freeconditions is disclosed for the first time. This novel procedure involves easy to obtain isatin and N,3-diaryl-3-oxo-propanthioamide derivatives in a series of DMAP catalyzed in situ transformations
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.
Rhodium(II)-Catalyzed Annulative Coupling of β-Ketothioamides with α-Diazo Compounds: Access to Highly Functionalized Thiazolidin-4-ones and Thiazolines
An operationally simple and efficient one-pot protocol for the synthesis of highly functionalized thiazolidin-4-ones and thiazolines has been devised via Rh(OAc)2-catalyzed annulative coupling of β-ketothioamides with diazo compounds under mild reaction conditions for the first time. This double functionalization of diazo compounds proceeds via selective S-alkylation followed by intramolecular N-cyclization