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。
Direct lithiation of chalcogenachromones, -flavones, and -pyranones. The interconversion and electrophilic capture of ring-opened and ring-closed anions