作者:Steven W. Knowlden、Brian V. Popp
DOI:10.1021/acs.organomet.2c00184
日期:2022.7.25
An experimental study of the effect of CO2 pressure on the copper(I)-catalyzed boracarboxylation of α-substituted vinyl arenes is reported. Preliminary experiments using ICyCuCl catalyst (ICy = 1,3-bis(cyclohexyl)imidazol-2-ylidine) showed that boracarboxylation of tert-butylstyrene can be achieved in 30 min at modest CO2 pressure (3–6 atm) as opposed to 24–36 h at atmospheric pressure. Due to increased
报道了CO 2压力对铜(I)催化的α-取代乙烯基芳烃硼羧化反应的影响的实验研究。使用 ICyCuCl 催化剂(ICy = 1,3-bis(cyclohexyl)imidazol-2- ylidine)的初步实验表明,在适中的 CO 2压力(3–6 atm)而不是 24大气压下–36 小时。由于增加的底物空间位阻使 CO 2的催化还原在动力学上竞争,α-甲基苯乙烯的硼羧化,即使在适度的 CO 2压力下,产率也很差。低二氧化碳2压力和 SIMesCuCl 催化剂 (SIMes = 1,3-bis(2,4,6-trimethylphenyl)imidazol-4,5-dihydro-2-ylidine) 提供了中等至良好产率的电子和空间多样化的季铵 α-羧酸基团具有β-硼酸酯官能团的酸性产物。