with imidazolidines/hexahydropyrimidines, thus providing a general, economical, and efficient route to construct different sized (six- to nine-membered) diaza-heterocycles in moderate to excellent yields under mild reaction conditions. This strategy features the use of copper catalyst to accomplish such diverse annulations and the utilization of imidazolidines/hexahydropyrimidines as stable 1,5-/1,6-dipoles
本文报道了前所未有的铜催化形式 [ n + 1]/[ n + 3] ( n = 5, 6) 重氮化合物与咪唑烷/六氢嘧啶的环加成反应,从而提供了一种通用、经济和有效的途径来构建不同尺寸的(六至九元)二氮杂杂环在温和的反应条件下具有中等至优异的产率。该策略的特点是使用铜催化剂来完成这种多样化的环化,并使用咪唑烷/六氢嘧啶作为稳定的 1,5-/1,6-偶极子。
Stereodivergent Syntheses of N-heterocycles by Catalyst-Controlled Reaction of Imidazolidines with Allenes
Mechanistic investigations indicate that water acts as a proton shuttle to assist the [1,3]-hydrogen shift in the Friedel–Crafts cyclization process. This strategy features the use of imidazolidines as stable 1,5-dipoles for [5 + 2] cycloadditions and the utilization of an iron catalyst to accomplish the [5 + 2] cycloaddition/Friedel–Crafts cyclization cascades in a highly diastereoselective manner
Saturated 1,4-diazocanes are highly important for medicinal chemistry and drug discovery, but their syntheses are often tedious. Herein, we report a copper-catalyzed (5 + 3) annulation of donor–acceptorcyclopropanes with imidazolidines, thereby providing a straightforward method to access a library of saturated 1,4-diazocanes in moderate to excellent yields under mild reaction conditions. More importantly
Utilizing Nitroarenes and HCHO to Directly Construct Functional N‐Heterocycles by Supported Cobalt/Amino Acid Relay Catalysis
作者:Jialu Sun、Chenggang Ci、Huanfeng Jiang、Pierre. H. Dixneuf、Min Zhang
DOI:10.1002/anie.202303007
日期:——
By relay catalysis of a supported bifunctional cobalt catalyst and L-proline, a reductive annulation reaction of nitroarenes and formaldehyde involving both C−C and C−N bond formations is presented, which enables direct and diverse access to 1,3-diaryl imidazolines.