highly efficient Pd/Xiang-Phos catalyzedenantioselective carboetherification of alkenyl oximes with either aryl or alkenyl halides, delivering various chiral 3,5-disubstituted and 3,5,5-trisubstituted isoxazolines in good yields with up to 97 % ee. The sterically bulky and electron-rich (S,Rs)-NMe-X2 ligand is responsible for the excellent reactivities and enantioselectivities. The salient features of this
Electrochemical Tandem Cyclization of Unsaturated Oximes with Diselenides: A General Approach to Seleno Isoxazolines Derivatives with Quaternary Carbon Center
cyclization of unsaturated oximes with diselenides has been developed to provide a general access to seleno isoxazolines (35 examples). This novel protocol features mild reaction conditions (metal‐ and oxidant‐free), good functional group tolerance (including ester, sulfone, heterocycles), and promising scalability. Moreover, two plausible reaction pathways have been proposed based on the cyclic voltammetry
Palladium-Catalyzed Oxime Assisted Intramolecular Dioxygenation of Alkenes with 1 atm of Air as the Sole Oxidant
作者:Ming-Kui Zhu、Jun-Feng Zhao、Teck-Peng Loh
DOI:10.1021/ja100716x
日期:2010.5.12
This paper describes a palladium-catalyzed oxime assisted intramolecular dioxygenation of alkenes by using 1 atm of air as the sole oxidant under extremely mild conditions, which demonstrated the feasibility of incorporating atmospheric oxygen into synthetically useful products under 1 atm of air at room temperature.