Highly regioselective synthesis of aryl chalcogenides through C–H functionalization of arenes
作者:Jun-Hao Cheng、Chih-Lun Yi、Tsung-Jui Liu、Chin-Fa Lee
DOI:10.1039/c2cc33950a
日期:——
We report here the regioselective synthesis of aryl chalcogenides through the iridium-catalyzed meta CâH borylation followed by copper-catalyzed CâS coupling reaction with chalcogenide sources in one pot, giving the 3,5-disubstituted aryl chalcogenides with high regioselectivity and good yields.
been studied from aryl bromide and phenol/aryl disulfide/diselenide substrates. A series of unsymmetrical diaryl chalcogenides were accessedfrom aryl bromide and diaryl dichalcogenide precursors by using 2.5 equiv of potassium tert-butoxide in DMSO at 80 °C. Unsymmetrical diaryl ethers were also obtained by using phenol precursors at 40–45 °C. Aryl bromides with methyl, trifluoromethyl, methoxy and
A General Procedure for the Regioselective Synthesis of Aryl Thioethers and Aryl Selenides Through C-H Activation of Arenes
作者:Chih-Lun Yi、Tsung-Jui Liu、Jun-Hao Cheng、Chin-Fa Lee
DOI:10.1002/ejoc.201300248
日期:2013.6
A generalprocedure for the synthesis of aryl thioethers and aryl selenides in one-pot through sequential iridium-catalyzed C–H borylation and copper-promoted C–S and C–Se bond formation is described. Functional groups including chloro, nitro, fluoro, trifluoromethyl, and nitrogen-containing heterocycles were all tolerated under the reaction conditions. Importantly, not only aryl thiols and selenides
Transition-metal-catalyzed one-pot selenylation of electrophilic arylating agents using triphenyltin chloride/Se as a phenylselenating agent
作者:Zeinab Shirvandi、Bahareh Atashkar、Mohammad Ali Zolfigol、Amin Rostami
DOI:10.1039/d2ob00011c
日期:——
phenyl aryl selenides through a three-component couplingreaction of triphenyltin chloride with aryl halides, phenolic esters or nitroarenes, and Se powder catalyzed by CuI or Cu(OAc)2 in the presence of a base in PEG200 at 90–100 °C have been developed. Also, NiFe2O4 as a magnetically reusable nanocatalyst was applied in these reactions under similar reaction conditions. The present methods are superior
在碱存在下,通过三苯基氯化锡与芳基卤化物、酚酯或硝基芳烃和 Se 粉末的三组分偶联反应合成苯芳基硒化物的三种新颖有效的方案已开发出 90–100 °C 的 PEG200。此外,NiFe 2 O 4作为磁性可重复使用的纳米催化剂,在类似的反应条件下应用于这些反应。由于首次使用三苯基氯化锡/Se作为苯基硒化剂,酚酸酯和硝基芳烃作为偶联伙伴形成C-Se-C键,本方法优于其他目前可用的方法,是一种绿色溶剂,价格低廉和可重复使用的催化剂,避免使用任何有毒且昂贵的芳基硒化试剂。