作者:Shiyi Yang、Weiping Tang、Zhanhui Yang、Jiaxi Xu
DOI:10.1021/acscatal.8b02495
日期:2018.10.5
An iridium-catalyzed, highly efficient, and site-selective deoxygenation of primary, secondary, and tertiary alcohols has been realized, under the assistance of a 4-(N-substituted amino)aryl directing group. Only the hydroxyl adjacent to the directing group can be deoxygenated. The deoxygenation is performed in water, with formic acid as both the promoter and hydride donor. Excellent yields and functionality
在4-(N-取代的氨基)芳基指导基团的辅助下,已经实现了伯,仲和叔醇的铱催化的,高效的,位点选择性的脱氧。只有与导向基团相邻的羟基可以被脱氧。脱氧在水中进行,甲酸作为促进剂和氢化物供体。获得了出色的产量和功能公差,以及高效率(S / C高达1 000 000,TOF高达44.5万h –1)。动力学同位素效应研究表明,氢化物的形成是决定速率的步骤,脱氧遵循S N1型途径。已经证明脱氧方案可用于天然存在的酮和类固醇的结构修饰。