Rhenium-Catalyzed Insertion of Aldehyde into a C−H Bond: Synthesis of Isobenzofuran Derivatives
摘要:
A rhenium complex, [ReBr(CO)3(thf)]2, catalyzed reactions of aromatic ketimines with aldehydes to give isobenzofuran derivatives in good to excellent yields. In contrast to ruthenium and rhodium catalysts, aldehydes, which are polar unsaturated molecules, inserted into the C-H bond after activation by the rhenium complex.
Rhenium-catalyzed synthesis of naphthalene derivatives via insertion of aldehydes into a C–H bond
作者:Yoichiro Kuninobu、Yuta Nishina、Kazuhiko Takai
DOI:10.1016/j.tet.2007.05.083
日期:2007.8
A rhenium complex, [ReBr(CO)3(THF)]2, catalyzed reactions of aromatic ketimines and aldehydes with dienophiles, followed by dehydration, to give naphthalene derivatives in good to excellent yields. This reaction proceeds via C–H bond activation, insertion of an aldehyde, intramolecular nucleophilic cyclization, reductive elimination, elimination of aniline and Diels–Alder reaction. After dehydration
Transition-Metal-Free Superbase-Catalyzed C–H Vinylation of Aldimines with Acetylenes to 1-Azadienes
作者:Elena Yu. Schmidt、Ivan A. Bidusenko、Nadezhda I. Protsuk、Yan V. Demyanov、Igor A. Ushakov、Alexander V. Vashchenko、Boris A. Trofimov
DOI:10.1021/acs.joc.9b03192
日期:2020.3.6
Aldimines react with aryl- and hetarylacetylenes in the presence of KOBut/dimethyl sulfoxide (DMSO) or NaOBut/DMSO systems under exceptionally mild conditions (14 °C, 1 h) to afford C-H-vinylated products, 1-azadienes of E configuration relative to the C-C bond, in up to 72% yield. Vinylation involves the unprecedentedly fast multiposition proton transfer in the intermediate adducts of acetylene to