(<i>Z</i>)- or (<i>E</i>)-Selective Hydrogenation of Potassium (3,3,3-Trifluoroprop-1-yn-1-yl)trifluoroborate: Route to Either Isomer of β-Trifluoromethylstyrenes
作者:P. Veeraraghavan Ramachandran、Wataru Mitsuhashi
DOI:10.1021/acs.orglett.5b00235
日期:2015.3.6
vinylborate in >98% purity is described. The initially formed (Z)-isomer of the alkene is transformed to the (E)-isomer with time, irrespective of the catalyst used; coupling with bromo- and iodoarenes provides a variety of (Z)- or (E)-β-trifluoromethylstyrenes. Also, a safe synthesis of the alkynyltrifluoroborate from HFC-245fa and BF3·OEt2 has been described.
描述了Pd催化的(3,3,3-三氟丙-1-炔-1-基)三氟硼酸钾的氢化反应,提供纯度> 98%的乙烯基硼酸酯的(Z)-或(E)-异构体。烯烃的最初形成的(Z)异构体会随时间转变为(E)异构体,而与所使用的催化剂无关。与溴代和碘代芳烃偶联可提供各种(Z)-或(E)-β-三氟甲基苯乙烯。另外,已经描述了由HFC-245fa和BF 3 ·OEt 2安全合成炔基三氟硼酸酯。