作者:Guangliang Tu、Guodong Ju、Shun-Jun Ji、Yingsheng Zhao
DOI:10.1021/acs.orglett.2c00417
日期:2022.3.25
10-phenanthroline with nickel(II) as the catalyst. A wide variety of anisoles were compatible, leading to para-carboxylated products in moderate to good yields. A preliminary mechanistic study suggested that the Ni(II) complex coordinates with the methoxyl group of the aromatic ring, which may have increased the steric hindrance at the ortho and meta positions, while this weak interaction reduces the aromaticity
在自由基与芳环反应过程中控制位点选择性一直是自由基化学中的一个挑战。在此,我们报道了在 2,9-二甲基-4,7-二苯基-1,10-菲咯啉和镍的辅助下,溴仿自由基与对位苯环的直接反应,实现苯甲醚的位点选择性羧化。(二)作为催化剂。多种苯甲醚是相容的,从而以中等至良好的产率产生对羧基化产物。初步机理研究表明,Ni(II) 配合物与芳环的甲氧基配位,这可能增加了邻位和间位的空间位阻。位置,而这种弱相互作用降低了芳环的芳香性,提供活化的苯环,从而导致高度对位选择性羧化。