描述了炔基(苯基)碘化甲苯磺酸盐与全氟烷烃亚磺酸钠(R fn SO 2 Na)的无添加剂和过渡金属的全氟烷烃磺酰化。亲核性差的R fn SO 2 Na与二氯甲烷中的炔基(苯基)碘鎓盐在室温下在氮气氛下反应5-60分钟,从而以令人满意的定量收率提供了各种炔属三氟甲酮和炔基全氟烷基砜。碘鎓盐中芳基乙炔基部分的苯环上取代基的位置对反应有很大影响。五元环乙烯基砜的形成表明该反应通过亚烷基卡宾中间体。此外,成功扩大反应规模也证明了该新方法的实用性。该方法的优点包括反应时间短,条件温和以及易于获得全氟链烷磺酰化试剂(R fn SO 2 Na)。
Functionalisation of ethereal-based saturated heterocycles with concomitant aerobic C–H activation and C–C bond formation
作者:Nehaal Ahmed、Richard J. Spears、Tom D. Sheppard、Vijay Chudasama
DOI:10.1039/d2sc01626e
日期:——
emphasis on sustainable synthesis, aerobic C–Hactivation (the use of oxygen in air to activateC–H bonds) represents a highly attractive conduit for the development of novel synthetic methodologies. Herein, we report the air mediated functionalisation of various saturated heterocycles and ethers via aerobically generated radical intermediates to form new C–C bonds using acetylenic and vinyl triflones as radical
Visible-Light-Initiated Sequential Trifluoromethylation/Remote C(sp<sup>3</sup>)–H Alkynylation of Vinyl Azides by Radical Relay
作者:Zirui Chen、Yunnan Duan、Shitao Sun、Bin Lin、Xiaozu Liu、Peijun Liu
DOI:10.1021/acs.joc.3c00170
日期:——
α-alkyl-substituted vinyl azides using acetylenic triflones as both the trifluoromethyl and alkyne donors is described. The reaction occurred under environmentally benign and radical initiator-free reaction conditions, affording γ-alkynylated trifluoromethylketonederivatives with a broad scope of substituents. Mechanistic studies suggested that the reaction is initiated via a triplet–triplet energy transfer between