Silver-Catalyzed Trifluoromethylalkynylation of Unactivated Alkenes with Hypervalent Iodine Reagents
作者:Xinkan Yang、Gavin Chit Tsui
DOI:10.1021/acs.orglett.9b03230
日期:2019.11.1
unactivated alkenes is presented. The reaction is catalyzed by silver(I) trifluoroacetate for the simultaneous construction of two C-C bonds (alkyl-alkyne and alkyl-CF3). By employing versatile hypervalentiodinereagents, ethynylbenziodoxolones, useful trifluoromethylalkynylated compounds can be prepared from simple alkenes displaying excellent functional group tolerability. A radical mechanism is proposed
Trifluoromethylation of Unactivated Alkenes with Me<sub>3</sub>SiCF<sub>3</sub> and <i>N</i>-Iodosuccinimide
作者:Xinkan Yang、Gavin Chit Tsui
DOI:10.1021/acs.orglett.9b00332
日期:2019.3.1
A novel approach to the trifluoromethylation of unactivated alkenes is presented. This reaction is promoted by N-iodosuccinimide (NIS) undervisiblelight irradiation without the need for photocatalysts. The mild conditions allow the direct synthesis of useful trifluoromethylated (E)-alkenes from readily available alkene feedstocks with excellent functional group tolerability. In addition, using easy-to-handle
We herein describe a straightforward allylic difluoromethylation reaction of unactivated alkenes. Compared to cross-couplings of prefunctionalized allylic substrates for the construction of allylic CF2H bonds, this reaction employs readily available alkenes as substrates under mild conditions. Difluoroaceticacid is used as an inexpensive and easy-to-handle source of CF2H radical under visible light
我们在此描述了未活化烯烃的直接烯丙基二氟甲基化反应。与用于构建烯丙基 CF 2 H 键的预官能化烯丙基底物的交叉偶联相比,该反应在温和条件下使用现成的烯烃作为底物。在 PIDA 的可见光照射下,二氟乙酸被用作廉价且易于处理的 CF 2 H 自由基来源。与之前发现的氢二氟甲基化相反,铜催化剂在将反应途径转向烯丙基二氟甲基化方面发挥着重要作用。
Synthesis and Reactivity of Trifluoromethylthiophosphonium Salts<sup>†</sup>
作者:Wen‐Qi Xu、Xiu‐Hua Xu、Feng‐Ling Qing
DOI:10.1002/cjoc.202300335
日期:2023.11
article described an unprecedented synthesis of trifluoromethylthiophosphonium salts from allyl trifluoromethyl sulfoxide and phosphines in the presence of trimethylsilyl trifluoromethanesulfonate (TMSOTf) through Mislow-Evans-type rearrangement. The resulting trifluoromethylthiophosphonium salts were firstly isolated and fully characterized. These fluoroalkylphosphonium salts, as exemplified by trifluoromethylthio
The fluorosulfonyldifluoromethylation of unactivated alkenes and (hetero)arenes with iododifluoromethanesulfonyl fluoride (ICF2SO2F) under visible light photoredoxcatalysis was successfully developed. Key to the successful fluorosulfonyldifluoromethylation of aromatic compounds was the usage of AgOTf as an additive to promote the formation of the CF2SO2F radical. The protocol provided a straightforward
成功开发了可见光光氧化还原催化下未活化烯烃和(杂)芳烃与碘二氟甲磺酰氟(ICF 2 SO 2 F)的氟磺酰二氟甲基化反应。芳香族化合物成功氟磺酰二氟甲基化的关键是使用AgOTf作为添加剂来促进CF 2 SO 2 F自由基的形成。该协议提供了一种简单的方法来在 sp 3和 sp 2碳上引入有趣且有用的 CF 2 SO 2 F 基团。