Ni-Catalyzed Defluorination for the Synthesis of <i>gem</i>-Difluoro-1,3-dienes and Their [4 + 2] Cycloaddition Reaction
作者:Minqi Zhou、Jian Zhang、Xing-Guo Zhang、Xingang Zhang
DOI:10.1021/acs.orglett.8b03841
日期:2019.2.1
allyl/propargyl carbonates using bis(pinacolato)diboron (B2pin2) as a reactant is described. The reaction proceeds under relatively mild reaction conditions, providing conjugated gem-difluoroalkenes in moderate to good yields. Applications of the resulting 1,1-difluoro-1,3-dienes by [4 + 2] cycloaddition reactions with maleimide led to cyclic fluorinated products efficiently.
描述了使用双(频哪醇)二硼(B 2 pin 2)作为反应物的镍催化的α-三氟甲基化的烯丙基/炔丙基碳酸酯的脱氟。该反应在相对温和的反应条件下进行,以中等至良好的产率提供了共轭的宝石-二氟烯烃。通过与马来酰亚胺的[4 + 2]环加成反应应用所得的1,1-二氟-1,3-二烯,可有效产生环状氟化产物。