2-difunctionalized benzenes, the sites other than its formal triple bond remain silent in typical benzyne transformations. An unprecedented aryne 1,2,3,5-tetrasubstitution was realized from 3-silylbenzyne and aryl allyl sulfoxide, the mechanistic pathway of which includes a regioselective aryne insertion into the S═O bond, a [3,6]-sigmatropic rearrangement, and a thermal aromatic 1,3-silyl migration cascade.
Aryne 1,2,3-Trifunctionalization with Aryl Allyl Sulfoxides
作者:Yuanyuan Li、Dachuan Qiu、Rongrong Gu、Junli Wang、Jiarong Shi、Yang Li
DOI:10.1021/jacs.6b06981
日期:2016.8.31
An aryne 1,2,3-trisubstitution with aryl allyl sulfoxides is accomplished, featuring an incorporation of C-S, C-O, and C-C bonds on the consecutive positions of a benzene ring. The reaction condition is mild with broad substrate scope. Preliminary mechanistic study suggests a cascade formal [2 + 2] reaction of aryne with S═O bond, an allyl S → O migration, and a Claisen rearrangement.
芳烃 1,2,3-三取代与芳基烯丙基亚砜完成,其特点是在苯环的连续位置上引入 CS、CO 和 CC 键。反应条件温和,底物范围广。初步机理研究表明,芳炔与 S=O 键发生级联形式的 [2 + 2] 反应、烯丙基 S → O 迁移和克莱森重排。
Sulfoxide synthesis from sulfinate esters under Pummerer-like conditions
作者:Akihiro Kobayashi、Tsubasa Matsuzawa、Takamitsu Hosoya、Suguru Yoshida
DOI:10.1039/d0cc02253e
日期:——
A facile synthetic method for the preparation of allyl sulfoxides by S-allylation of sulfinate esters proceeds through sulfonium intermediates without [3,3]-sigmatropic rearrangement and further Pummerer-type reactions of the resulting allyl sulfoxides. On the basis of the plausible reaction mechanism involving sulfonium salt intermediates, S-alkynylation and S-arylation were also accomplished.
Copper catalyzed oxidation of sulfides to sulfoxides with aqueous hydrogen peroxide
作者:Subbarayan Velusamy、Akkilagunta V. Kumar、Rakesh Saini、T. Punniyamurthy
DOI:10.1016/j.tetlet.2005.03.194
日期:2005.5
Copper(II) complex 1 catalyzes the oxidation of sulfides to sulfoxides with 30% H2O2 in high yields. Addition of a catalytic amount of TEMPO to the reaction mixture enhances the conversion and selectivity. Complex 1 can be recycled without loss of activity.
铜(II)配合物1以高收率催化硫化物氧化为30%H 2 O 2的亚砜。向反应混合物中加入催化量的TEMPO可提高转化率和选择性。配合物1可以循环使用而不会损失活性。
Electrochemical Activation of Nitromethane to Construct Isoxazoline Aldoximes
An unprecedented approach to isoxazoline aldoximes via the reactions of nitromethane and olefins is achieved. Nitromethane is electrochemically activated to serve as both the heterocyclic skeleton and oxime sources for the construction of isoxazoline aldoximes.