N-acylpyrroles were synthesized via olefin ring-closingmetathesis of diallylamines and in situ oxidative aromatization in the presence of the ruthenium Grubbs catalyst and a suitable copper catalyst. In the presence of Cu(OTf)2 and CuBr2, the reaction afforded N-sulfonyl- and N-acylpyrroles, respectively, in one pot. Under an oxygen atmosphere, the reaction went smoothly without the need of hydroperoxide
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