Gold(<scp>i</scp>)-catalyzed dehydrogenative cycloisomerization of 1,5-enynes
作者:Gen-Qiang Chen、Wei Fang、Yin Wei、Xiang-Ying Tang、Min Shi
DOI:10.1039/c6cc05423d
日期:——
Gold(I)-catalyzed dehydrogenative cycloisomeriaztion of cyclopropane tethered 1,5-enynes proceeded smoothly to give multisubstituted benzene derivatives in good to excellent yields. Synthetically important benzocyclobutenes can be produced in high yields in the...
Palladium-catalyzed Sonogashira coupling reactions in γ-valerolactone-based ionic liquids
作者:László Orha、József M Tukacs、László Kollár、László T Mika
DOI:10.3762/bjoc.15.284
日期:——
that the γ-valerolactone-based ionic liquid, tetrabutylphosphonium 4-ethoxyvalerate as a partially bio-based solvent can be utilized as alternative reaction medium for copper- and auxiliary base-free Pd-catalyzed Sonogashiracoupling reactions of aryl iodides and functionalized acetylenes under mild conditions. Twenty-two cross-coupling products were isolated with good to excellent yields (72-99%) and
Synthesis of Substituted Thiophenes through Dehydration and Heterocyclization of Alkynols
作者:Jian Li、Yang Liu、Zebin Chen、Jiaming Li、Xiaoliang Ji、Lu Chen、Yubing Huang、Qiang Liu、Yibiao Li
DOI:10.1021/acs.joc.1c03114
日期:2022.3.4
described for obtaining a variety of substituted thiophenes with functional potential via metal-free dehydration and sulfur cyclization of alkynols with elementalsulfur (S8) or EtOCS2K in moderate-to-good yields. The method provides the base-free generation of a trisulfurradicalanion (S3•–) and its addition to alkynes as an initiator. This research broadens the applications of S3•– in the synthesis
描述了一种方案,用于通过无金属脱水和硫环化炔醇与元素硫 (S 8 ) 或 EtOCS 2 K 以中等至良好的产率获得各种具有功能潜力的取代噻吩。该方法提供了无碱生成三硫自由基阴离子 (S 3 •– ) 并将其添加到炔烃中作为引发剂。本研究拓宽了S 3 •–在含硫杂环合成中的应用。
Cobalt-Promoted Electroreductive Cross-Coupling of Prop-2-yn-1-yl Acetates with Chloro(vinyl)silanes
作者:Chong-Hui Xu、Zhi-Qiang Xiong、Jing-Hao Qin、Xin-Hua Xu、Jin-Heng Li
DOI:10.1021/acs.orglett.3c02989
日期:2023.10.6
An electroreductive cross-coupling of prop-2-yn-1-yl acetates with chloro(vinyl)silanes for producing tetrasubstituted silylallenes is developed. The method enables the formation of a new C─Si bond through the cathodic reduction formation of the silyl radical, radical addition across the C≡C bond, the alkenyl anion intermediate formation, and deacetoxylation and represents a mild, practical route to