[1,3]-Claisen Rearrangement via Removable Functional Group Mediated Radical Stabilization
作者:Md Nirshad Alam、Soumya Ranjan Dash、Anirban Mukherjee、Satish Pandole、Udaya Kiran Marelli、Kumar Vanka、Pradip Maity
DOI:10.1021/acs.orglett.0c04109
日期:2021.2.5
A thermal O-to-C [1,3]-rearrangement of α-hydroxy acid derived enol ethers was achieved under mild conditions. The 2-aminothiophenol protection of carboxylic acids facilitates formation of the [1,3] precursor and its thermal rearrangement via stabilization of a radical intermediate. Experimental and theoretical evidence for dissociative radical pair formation, its captodative stability via aminothiophenol
在温和条件下实现了α-羟酸衍生的烯醇醚的O-C到[1,3] -C热重排。羧酸的2-氨基硫酚保护通过自由基中间体的稳定化促进[1,3]前体的形成及其热重排。给出了解离自由基对的形成,其通过氨基硫酚的capdodative稳定性和独特的溶剂效应的实验和理论证据。氨基硫酚被脱保护以免受重排产物的影响,以及在衍生为有用的合成子后也被脱保护。