Formation of quaternary carbons through cobalt-catalyzed C(sp<sup>3</sup>)–C(sp<sup>3</sup>) Negishi cross-coupling
作者:Eduardo Palao、Enol López、Iván Torres-Moya、Antonio de la Hoz、Ángel Díaz-Ortiz、Jesús Alcázar
DOI:10.1039/d0cc02734k
日期:——
quaternary carbons is a key challenge in organic and medicinal chemistry. We report a cobalt-catalyzed C(sp3)–C(sp3) cross-coupling that allows for the introduction of benzyl, heteroarylmethylzinc and allyl groups to halo-carbonyl substrates. The cross-coupling reaction is selective for C(sp3)-over C(sp2)-halides, in contrast to most used catalytic metals, and allows access to novel scaffolds of pharmaceutical
Competitive Reaction Pathways for <i>o</i>-Anilide Aryl Radicals: 1,5- or 1,6-Hydrogen Transfer versus Nucleophilic Coupling Reactions. A Novel Rearrangement to Afford an Amidyl Radical
作者:Valentina Rey、Adriana B. Pierini、Alicia B. Peñéñory
DOI:10.1021/jo801892c
日期:2009.2.6
Together with this last rearrangedproduct, the ipso substitution derivative was also observed. Similar results were obtained in the PET reactions of 4d (R = t-Bu) with anions 2 and 3 under entrainment conditions with the enolate anion from cyclohexenone (5) or the tert-butoxide anion (6). From this novelrearrangement, and only under reductive conditions by PET reaction with anion 5, iodide 4d (R