K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>-Mediated Selective Trifluoromethylacylation and Trifluoromethylarylation of Alkenes under Transition-Metal-Free Conditions: Synthetic Scope and Mechanistic Studies
作者:Lin Tang、Zhen Yang、Xueping Chang、Jingchao Jiao、Xiantao Ma、Weihao Rao、Qiuju Zhou、Lingyun Zheng
DOI:10.1021/acs.orglett.8b02846
日期:2018.10.19
on and -arylation of alkenes with inexpensive CF3SO2Na and K2S2O8 in aqueous media has been developed, respectively, affording the highly chemoselective synthesis of CF3-functionalized chroman-4-ones and chromanes in satisfactory yields. Control experiments and DFT calculations indicate that the CF3SO2Na/K2S2O8 system is capable of trifluoromethylating the substrate of alkenes without a transition
已开发出一种实用且有效的方法,分别在水性介质中用廉价的CF3SO2Na和K2S2O8对烯烃进行分子内自由基三氟甲基酰化和芳基化,从而以令人满意的产率提供了CF3官能化的苯并四氢吡喃和苯并吡喃的高化学选择性合成。对照实验和DFT计算表明,CF3SO2Na / K2S2O8体系能够在没有过渡金属催化剂的情况下对烯烃的底物进行三氟甲基化,并且由K2S2O8将CF3SO2Na氧化为·CF3参与了速率确定步骤。