Cesium Hydroxide-mediated Regio- and Stereoselective Hydroamidation of Internal Aryl Alkynes with Primary Amides
作者:Chiaki Yamamoto、Koji Hirano、Masahiro Miura
DOI:10.1246/cl.170379
日期:2017.7.5
hydroamidation of internal aryl alkynes with primary amides has been developed. The reaction proceeds with high anti-selectivity to deliver the corresponding stereodefined (Z)-enamides in good yields. The alkali base-promoted system is also compatible with unsymmetrical aryl alkyl alkynes, and the hydroamidated products are obtained with high regioselectivity as well as stereoselectivity.
divergent approach to indoles and oxazoles from enamides has been developed. The picolinamide-derived enamides undergo the intramolecular aromatic C–H amination in the presence of a Cu(OPiv)2 catalyst and an MnO2 oxidant to form the corresponding indoles in good yields. On the other hand, simpler aryl- or alkyl-substituted enamides are converted to the 2,4,5-trisubstituted oxazole frameworks via vinylic C–H