Aerobic Acyloxylation of Allylic C−H Bonds Initiated by a Pd
<sup>0</sup>
Precatalyst with 4,5‐Diazafluoren‐9‐one as an Ancillary Ligand
作者:Caitlin V. Kozack、Jennifer A. Sowin、Jonathan N. Jaworski、Andrei V. Iosub、Shannon S. Stahl
DOI:10.1002/cssc.201900727
日期:2019.7.5
Palladium‐catalyzed allylic C−H oxidation has been widely studied, but most precedents use acetic acid as the coupling partner. In this study, a method compatible with diverse carboxylic acid partners has been developed. Use of a Pd0 precatalyst under aerobic reaction conditions leads to oxidation of Pd0 by O2 in the presence of the desired carboxylic acid to generate a PdII dicarboxylate that promotes
钯催化的烯丙基CH氧化已被广泛研究,但大多数先例使用乙酸作为偶联伴侣。在这项研究中,开发了一种与各种羧酸伙伴兼容的方法。在好氧反应条件下使用Pd 0预催化剂会导致Pd 0在所需羧酸的存在下被O 2氧化,生成Pd II二羧酸盐,从而促进烯丙基CH键的酰氧基化。烯烃和羧酸试剂的比例约为1:1时,收率良好。优化的反应条件采用4,5-二氮杂芴-9-one(DAF)作为配体,并与醌/酞菁铁助催化剂体系结合使用,以支持好氧催化转化。