Nickel-Catalyzed One-Pot Carbonylative Synthesis of 2-Mono- and 2,3-Disubstituted Thiochromenones from 2-Bromobenzenesulfonyl Chlorides and Alkynes
作者:Wei Wang、Zhi-Peng Bao、Xinxin Qi、Xiao-Feng Wu
DOI:10.1021/acs.orglett.1c02442
日期:2021.8.20
A nickel-catalyzed one-pot carbonylation reaction of 2-bromobenzenesulfonyl chlorides with alkynes for the synthesis of thiochromenones has been established. Both terminal and internal alkynes were suitable substrates in this carbonylative transformation, and a broad range of 2-mono- and 2,3-disubstituted thiochromenone products were obtained in moderate to good yields with quite high functional group
Palladium-Catalyzed Carbonylative Four-Component Synthesis of Thiochromenones: The Advantages of a Reagent Capsule
作者:Chaoren Shen、Anke Spannenberg、Xiao-Feng Wu
DOI:10.1002/anie.201600953
日期:2016.4.11
reactions, especially those involving four or even more reagents, have been a long‐standing challenge because of the issues associated with balancing reactivity, selectivity, and compatibility. Herein, we demonstrate how the use of a reagent capsule provides straightforward access to synthetically valuable thiochromenone derivatives by a palladium‐catalyzed carbonylative four‐component reaction. To the
Transition-Metal-Free One-Pot Tandem Synthesis of 4-Quinolone and 4H-Thiochromen-4-one Derivatives Through Sequential Nucleophilic Addition–Elimination–SNAr Reaction
transformed to 4-quinolone or 4H-thiochromen-4-one products through intramolecular SNAr reaction, respectively. 4-Quinolone and 4H-thiochromen-4-one derivatives are readily synthesized in a tandemone-pot manner in good to excellent yields. Starting from (Z)-β-chlorovinyl ketones, an intermolecular nucleophilic addition of amines or sodium hydrogen sulfide to (Z)-β-chlorovinyl ketones was followed by elimination
摘要 4-喹诺酮和4 H-硫代色素-4-酮衍生物很容易以串联-一锅方式以良好至极好的产率合成。从(Z)-β-氯乙烯酮开始,分子间亲核加成胺或硫化氢钠到(Z)-β-氯乙烯酮中,然后消除氯阴离子,得到Z-烯胺或硫代烯醇中间体,可以将其转化通过分子内的S N Ar反应分别生成4-喹诺酮或4 H-硫代色素-4-酮。 4-喹诺酮和4 H-硫代色素-4-酮衍生物很容易以串联-一锅方式以良好至极好的产率合成。从(Z)-β-氯乙烯酮开始,分子间亲核加成胺或硫化氢钠到(Z)-β-氯乙烯酮中,然后消除氯阴离子,得到Z-烯胺或硫代烯醇中间体,可以将其转化通过分子内的S N Ar反应分别生成4-喹诺酮或4 H-硫代色素-4-酮。
Elemental Chalcogen (Se, S) in PEG-400 to the Synthesis of Seleno- and Thioflavones from 2-Chlorophenyl Ethynyl Ketone and Nucleophilic Species of Chalcogen
作者:Patrick Nobre、Thiago Peglow、Ricardo Bartz、Angelita Barcellos、Raquel Jacob、Márcio Silva、Thiago Barcellos、Gelson Perin
DOI:10.21577/0103-5053.20210051
日期:——
for the synthesis of thio- and selenoflavones by the ring closure of 2-chlorophenyl ethynyl ketone with NaHY (Y = S, Se). These nucleophilic chalcogen species were generated in situ using NaBH4 to reduce the elemental chalcogen in the presence of polyethylene glycol-400 (PEG-400). The efficiency of this reaction is strongly dependent on the PEG-400 solvent, acting like a crown ether, complexing with the
Copper-Catalyzed One-Pot Synthesis of 2-Arylthiochromenones: An in Situ Recycle of Waste Byproduct as Useful Reagent
作者:Subramani Sangeetha、Govindasamy Sekar
DOI:10.1021/acs.orglett.8b03508
日期:2019.1.4
Copper-catalyzed one-pot synthesis of various 2-arylthiochromenones is developed using xanthate as an odorless sulfur source from easily acquirable 2′-halochalcones. This methodology demonstrates that the cross-coupled product thiochromanone synthesized from 2′-halochalcones (upstream reaction) is oxidized to thiochromenone (downstream reaction) in the same pot using waste byproduct (KI) of the first