Ammonium Salt-Catalyzed Highly Practical <i>Ortho</i>-Selective Monohalogenation and Phenylselenation of Phenols: Scope and Applications
作者:Xiaodong Xiong、Ying-Yeung Yeung
DOI:10.1021/acscatal.8b00327
日期:2018.5.4
An ortho-selective ammonium chloride salt-catalyzed direct C–H monohalogenation of phenols and 1,1′-bi-2-naphthol (BINOL) with 1,3-dichloro-5,5-dimethylhydantoin (DCDMH) as the chlorinating agent has been developed. The catalyst loading was low (down to 0.01 mol %) and the reaction conditions were very mild. A wide range of substrates including BINOLs were compatible with this catalytic protocol. Chlorinated
以1,3-二氯-5,5-二甲基乙内酰脲(DCDMH)作为氯化剂的邻位选择性氯化铵盐催化的苯酚和1,1'-联-2-萘酚(BINOL)的直接C–H单卤化反应具有已开发。催化剂负载量低(低至0.01mol%),反应条件非常温和。包括BINOL在内的多种底物均与该催化方案兼容。氯化的BINOL是有用的合成子,用于合成范围广泛的不容易合成的不对称3-芳基BINOL。另外,相同的催化体系可以促进酚的邻位选择性硒化。