Photopromoted Entry to Benzothiophenes, Benzoselenophenes, 3<i>H</i>-Indoles, Isocoumarins, Benzosultams, and (Thio)flavones by Gold-Catalyzed Arylative Heterocyclization of Alkynes
作者:Benito Alcaide、Pedro Almendros、Eduardo Busto、Fernando Herrera、Carlos Lázaro-Milla、Amparo Luna
DOI:10.1002/adsc.201700427
日期:2017.8.7
gold‐photoredox‐catalyzed reactions of heteroatom (N, S, Se, O) tethered alkynes with arenediazonium salts selectively proceeded to build vicinal diaryl‐substituted 2H‐benzo[e][1,2]thiazine 1,1‐dioxides (benzosultams), benzoselenophenes, benzothiophenes, 4H‐chromen‐4‐ones (flavones), 3H‐indoles, 1H‐isochromen‐1‐ones (isocoumarins), and 4H‐thiochromen‐4‐ones (thioflavones). Moreover, the utility of functionalized
Unified Approach to (Thio)chromenones via One-Pot Friedel–Crafts Acylation/Cyclization: Distinctive Mechanistic Pathways of β-Chlorovinyl Ketones
作者:Hun Young Kim、Eunsun Song、Kyungsoo Oh
DOI:10.1021/acs.orglett.6b03348
日期:2017.1.20
method to chromenones and thiochromenones has been developed using a one-pot Friedel–Craftsacylation of alkynes with suitably substituted benzoyl chlorides. This unified approach to (thio)chromenones is readily applicable to aryl- and alkylalkynes where the stereochemically well-defined β-chlorovinyl ketone intermediates undergo distinctively different cyclization pathways. The ready availability
Nickel-catalyzed cycloadditions have been developed where thiophthalic anhydrides react with alkynes to afford substituted sulfur-containing heterocyclic compounds. Selective formations of thioisocoumarins, benzothiophenes, and thiochromones were accomplished with three different reaction conditions.
<scp>Rhodium‐Catalyzed</scp>
Transannulation of 1,2,
<scp>3‐Thiazoles</scp>
with Alkynes for the Direct Synthesis of Thiochromenones
作者:Jun Pan、Ziyao Zhang、Lili Chen、Ning Jiao
DOI:10.1002/cjoc.202200603
日期:2023.3
A rhodium-catalyzed denitrogenative carbonylation of 1,2,3-thiadiazole with alkynes to construct (benzo)thiochromenones is developed. Both terminal and internal alkynes were compatible in this [3+2+1] cycloaddition, affording a broad range of poly-substituted thiochromenones. Unsymmetrical alkyne substrates exhibited good regioselectivity. It is noteworthy that the present strategy could be used to
开发了铑催化的 1,2,3-噻二唑与炔烃的脱氮羰基化反应以构建 (benzo)thiochromenones。末端和内部炔烃在这种 [3+2+1] 环加成反应中是相容的,提供了广泛的多取代硫代苯并噻吩酮。不对称炔底物表现出良好的区域选择性。值得注意的是,目前的策略可用于构建单环和苯并硫代苯并噻吩酮,它是 CO 插入的脱氮环化的新例子。