据报道,甲磺酸和氟化氢钾的组合用于叔醇的脱氧氟化。在无金属条件下,使用容易获得、廉价且易于处理的试剂,一系列叔醇可以以优异的产率转化为相应的氟化物(23个例子的平均产率为85%)。机理研究表明,反应在 0 °C 下进行,部分通过消除/氢氟化途径进行,但没有观察到残留烯烃。还证明了这些条件在醚和酯的氟化中的应用。
据报道,甲磺酸和氟化氢钾的组合用于叔醇的脱氧氟化。在无金属条件下,使用容易获得、廉价且易于处理的试剂,一系列叔醇可以以优异的产率转化为相应的氟化物(23个例子的平均产率为85%)。机理研究表明,反应在 0 °C 下进行,部分通过消除/氢氟化途径进行,但没有观察到残留烯烃。还证明了这些条件在醚和酯的氟化中的应用。
Carbocyanation of trisubstituted olefins via Cu-catalyzed atom transfer radical addition
作者:Shin Kamijo、Shinya Yokosaka、Masayuki Inoue
DOI:10.1016/j.tetlet.2012.06.004
日期:2012.8
carbocyanation of non-polarized trisubstituted olefins 1 has been achieved by employing chlorinated cyanides 2 as starting materials. The present reaction gives the carbocyanated product 3 through radical-based 1,3-transfer of CN. Consequently, two different carbon units, cyano and chlorocyanomethyl groups, are introduced into the highly substituted olefins, generating consecutive quaternary and tertiary
Conformational Flexibility as a Tool for Enabling Site-Selective Functionalization of Unactivated <i>sp</i><sup><i>3</i></sup> C–O Bonds in Cyclic Acetals
作者:Ciro Romano、Laura Talavera、Enrique Gómez-Bengoa、Ruben Martin
DOI:10.1021/jacs.2c04513
日期:2022.7.6
A dual catalytic manifold that enables site-selective functionalization of unactivated sp3 C–O bonds in cyclic acetals with aryl and alkyl halides is reported. The reaction is triggered by an appropriate σ*–p orbital overlap prior to sp3 C–O cleavage, thus highlighting the importance of conformational flexibility in both reactivity and site selectivity. The protocol is characterized by its excellent