Rh(II)-Catalyzed Chemoselective Oxidative Amination and Cyclization Cascade of 1‑(Arylethynyl)cycloalkyl)methyl Sulfamates

2017-06-28T14:55:22Z (GMT) by Dong Pan Yin Wei Min Shi
A Rh­(II)-catalyzed chemoselective oxidative amination and cyclization cascade of 1-(arylethynyl)­cyclo­alkyl)­methyl sulfamates has been presented. For a cyclopropyl or cyclobutyl moiety containing alkynyl sulfamates, the reactions underwent a metallonitrene-initiated alkyne oxidation along with cyclopropyl ring expansion or alkoxyl moiety migration to give cyclobutane-fused or methylene­cyclobutane-containing heterocycles. In the case of a cyclopentyl or cyclohexyl moiety containing sulfamate, the reaction underwent a direct C–H bond insertion event to afford the corresponding nitrogen-containing heterocyclic product.