Accessing <i>para</i>-Alkylphenols via Iridium-Catalyzed Site-Specific Deoxygenation of Alcohols
作者:Jing Wang、Tingting Wang、Hongguang Du、Ning Chen、Jiaxi Xu、Zhanhui Yang
DOI:10.1021/acs.joc.3c01294
日期:2023.9.1
An iridium-catalyzed and phenol-directed deoxygenation of benzylic alcohols comes as an alternative access to 4-alkylphenols, featuring low catalyst loading (S/C up to 20,000, TOF up to 12,400 h–1), high functionality compatibility, and excellent site-selectivity. The applications in late-stage modification of steroids and gram-scale total synthesis of a Gastrodia elata extract are highlighted. Mechanistically
铱催化和苯酚引导的苄醇脱氧是制备 4-烷基苯酚的替代方案,具有催化剂负载量低(S / C高达 20,000,TOF 高达 12,400 h –1)、高功能兼容性和优异的现场性等特点-选择性。重点介绍了天麻提取物在类固醇后期修饰和克级全合成中的应用。从机理上讲,醌甲基化物的中间作用控制了位点选择性,氢化铱的形成作为限速步骤。