Elemental Chalcogen (Se, S) in PEG-400 to the Synthesis of Seleno- and Thioflavones from 2-Chlorophenyl Ethynyl Ketone and Nucleophilic Species of Chalcogen
A flexible and efficient carbonylative synthesis of thiochromenones from the commercially available materials by utilizing tert-butyl isocyanide as carbonyl source has been developed. This methodology efficiently constructs thiochromenones in moderate to excellent yields with the advantages of wide range of substrates and being applicable to library synthesis.
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。
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
A new synthesis of 4H-1-benzothiopyran-4-ones using (trimethylsilyl)methylenetriphenylphosphorane
作者:Pradeep Kumar、Mandar S Bodas
DOI:10.1016/s0040-4020(01)00977-2
日期:2001.11
The reaction of silyl ester of S-acyl(aroyl) thiosalicylic acids 3 with (trimethylsilyl)methylenetriphenylphosphorane 4 in step wise fashion leads to the acylphosphoranes 7, which subsequently undergo intramolecular Wittig cyclization on the thiolester carbonyl to afford the 4H-1-benzothiopyran-4-ones 8 in good to excellent yields.
S-酰基(芳酰基)硫代水杨酸3的甲硅烷基酯与(三甲基甲硅烷基)亚甲基三苯基膦烷4的逐步反应导致酰基膦酸酯7,其随后在硫酯羰基上进行分子内Wittig环化,得到4 H -1-苯并噻喃-4-ones 8的产量好至极好。