Overcoming the Deallylation Problem: Palladium(II)-Catalyzed Chemo-, Regio-, and Stereoselective Allylic Oxidation of Aryl Allyl Ether, Amine, and Amino Acids
作者:Kartic Manna、Hasina Mamataj Begam、Krishanu Samanta、Ranjan Jana
DOI:10.1021/acs.orglett.0c02465
日期:2020.10.2
We report herein a Pd(II)/bis-sulfoxide-catalyzed intramolecular allylic C–H acetoxylation of aryl allyl ether, amine, and amino acids with the retention of a labile allyl moiety. Mechanistically, the reaction proceeds through a distinct double-bond isomerization from the allylic to the vinylic position followed by intramolecular carboxypalladation and the β-hydride elimination pathway. For the first
我们在此报告了芳基烯丙基醚,胺和氨基酸的Pd(II)/双亚砜催化的分子内烯丙基CH乙酰氧基化,同时保留了不稳定的烯丙基部分。从机理上讲,反应是通过从烯丙基位置到乙烯基位置的独特的双键异构化进行的,然后进行分子内羧基palpalpalation和β-氢化物消除途径。首次建立了具有出色的非对映选择性的N-烯丙基保护氨基酸的C–H氧化,可通过1,3-syn加成提供五元杂环。