[GRAPHICS]The first examples of ring-closing metathesis reactions of olefin-containing enamides using ruthenium-based catalysts have been demonstrated, A preliminary investigation into the scope and limitations, leading to protected five- and six-membered cyclic enamides, will be presented.
Iron-Catalyzed Synthesis of Conformationally Restricted Bicyclic N-Heterocycles via [2+2]-Cycloaddition: Exploring Ring Expansion─Mechanistic Insights and Challenges
作者:Leif E. Hertwig、Thilo Bender、Felix J. Becker、Patrick Jäger、Serhiy Demeshko、Sophie Jana Gross、Joachim Ballmann、Dragoş-Adrian Roşca
DOI:10.1021/acscatal.3c01305
日期:2023.5.5
for synthesizing conformationally restricted cyclobutane-fused N-heterocycles from unactivated precursors. This method is orthogonal to the established photocatalytic methods, extends the range of substrates, and provides a single-step route to previously unattainable cyclobutane-fused piperidines and azepanes. Ring stereochemistry depends on size, with five- and six-membered rings adopting a cis configuration
作者:John B. Feltenberger、Ryuji Hayashi、Yu Tang、Eric S. C. Babiash、Richard P. Hsung
DOI:10.1021/ol901434g
日期:2009.8.20
Benzyne-[2 + 2] cycloadditions with enamides are described. This effort led to the development of a highly stereoselectivetandem [2 + 2] cycloaddition−pericyclic ring-opening−intramolecular-N-tethered-[4 + 2] cycloaddition for rapid assembly of nitrogen heterocycles.
作者:Sape S. Kinderman、Jan H. van Maarseveen、Hans E. Schoemaker、Henk Hiemstra、Floris P. J. T. Rutjes
DOI:10.1021/ol016013e
日期:2001.6.1
[GRAPHICS]The first examples of ring-closing metathesis reactions of olefin-containing enamides using ruthenium-based catalysts have been demonstrated, A preliminary investigation into the scope and limitations, leading to protected five- and six-membered cyclic enamides, will be presented.