检查了甲氧基-芳基乙炔砜与各种碳负离子亲核试剂反应生成三种类型的产物。因此,(i)亲核试剂(MeLi·LiBr,乙烯基MgBr,LiCH 2 CN)显示出α加成,但是,(ii)Li– CC C–TMS提供了β加成(共轭加成)产物。通过在高温下存在邻甲氧基,可以增强通过α-加成/异构化/反式消除的(iii)置换反应。质子溶剂中的杂原子亲核试剂(氮,氧或硫原子)仅提供了所报道的缀合物加成产物。
检查了甲氧基-芳基乙炔砜与各种碳负离子亲核试剂反应生成三种类型的产物。因此,(i)亲核试剂(MeLi·LiBr,乙烯基MgBr,LiCH 2 CN)显示出α加成,但是,(ii)Li– CC C–TMS提供了β加成(共轭加成)产物。通过在高温下存在邻甲氧基,可以增强通过α-加成/异构化/反式消除的(iii)置换反应。质子溶剂中的杂原子亲核试剂(氮,氧或硫原子)仅提供了所报道的缀合物加成产物。
Abstract An efficient decarboxylative sulfonylation of arylacetylenic acids with sodium arylsulfinates has been achieved by an electro-oxidative strategy. This novel protocol offers a simple, efficient, and green route to a series of arylacetylenic sulfones in moderate yields under metal-free and external oxidant-free conditions. Graphical Abstract
Consecutive visible-light photoredox decarboxylative couplings of adipic acid active esters with alkynyl sulfones leading to cyclic compounds
作者:Jingjing Li、Hua Tian、Min Jiang、Haijun Yang、Yufen Zhao、Hua Fu
DOI:10.1039/c6cc04386k
日期:——
active esters (bis(1,3-dioxoisoindolin-2-yl)-substituted hexanedioates) with substituted 1-(2-arylethynylsulfonyl)benzenes have been developed under visible-light photocatalysis. The successive photoredox decarboxylative C-Cbondformation...
Visible-light photoredox synthesis of internal alkynes containing quaternary carbons
作者:Chang Gao、Jingjing Li、Jipan Yu、Haijun Yang、Hua Fu
DOI:10.1039/c6cc01632d
日期:——
A novel and efficient visible-light photoredox method for synthesis of internal alkynes containing quaternary carbons has been developed via couplings of N-phthalimidoyl oxalates of tert-alcohols with 1-(2-(arylsulfonyl)ethynyl)benzenes. The reactions were...
Photochemical alkynylation of hydrosilanes by iron catalysis
作者:Ling Ding、Yuxiu Liu、Kaikai Niu、Qingmin Wang
DOI:10.1039/d2cc04056e
日期:——
established synthetic routes retain some drawbacks regarding harsh reaction conditions or expensive/rare metal catalysts. Herein, we report a method for iron-catalyzed, visible-light-induced alkynylation of hydrosilanes to produce value-added silicon compounds. Alkynes bearing functional groups with different steric properties and alkyl/aryl hydrosilanes were both suitable substrates. Mechanistic studies
Here we show a practical iron-catalysed photoredox approach for C(sp3)–H alkynylation of methane, ethane, and other light alkanes without pre-functionalisation processes, producing valuable internal alkynes. The protocol has many advantages, including a concise and efficient system, good selectivity, mild conditions, wide application of the synthesised products, and low cost.