A novel enantioselective C-C bondcleavage has been achieved using palladium catalysts and chiral N,P-bidentate ligands in the asymmetric arylation, vinylation, and allenylation of tert-cyclobutanols. In these reactions, the enantioselective beta-carbon elimination of Pd(II) alcoholate formed in situ is the key step. Treatment of tert-cyclobutanols with arylating reagents in toluene in the presence
Oxidative Transformation of <i>tert</i>-Cyclobutanols by Palladium Catalysis under Oxygen Atmosphere
作者:Takahiro Nishimura、Kouichi Ohe、Sakae Uemura
DOI:10.1021/jo0016475
日期:2001.2.1
Palladium(II)-catalyzed oxidative reaction of tert-cyclobutanols involving the cleavage of a C-C bond via beta-carbon elimination under atmospheric pressure of oxygen is described. An alkylpalladium intermediate produced by beta-carbon elimination from a Pd(II) alcoholate gives a variety of products, depending on the substituents on the cyclobutane ring, in which reactions such as dehydrogenative ring