Palladium-catalyzed reactions of cyclopropanols bearing oxazoline directing group
作者:Ilya Novikau、Alaksiej Hurski
DOI:10.1016/j.tet.2018.01.038
日期:2018.3
Cyclopropanols bearing oxazoline directing group were investigated in palladium-catalyzed reactions. When the directing group and cyclopropanol unit were bonded through two- or three-carbon spacer, formation of unusual products was observed. Oxidative ring opening proceeded with uncommon regioselectivity providing linearenones as main products. The reaction of such cyclopropanols with aryl iodides
Diastereoselective Construction of α-Quaternary Carbon Centers in the Chiral-Auxiliary-Mediated Aza-Claisen Rearrangement of Ketene<i>N</i>-Allyl-<i>N</i>,<i>O</i>-acetals
作者:Mark J. Kurth、Edward G. Brown
DOI:10.1055/s-1988-27574
日期:——
The aza-Claisen rearrangement of ketene N-allyl-N,O-acetals has been applied to the diastereoselective construction of precursors of 2-quaternary 4-pentenoic acids (82-97% ds). Best yields are obtained when alkoxides are used to deprotonate the intermediate oxazolinium salts.