Construction of NH‐Unprotected Spiropyrrolidines and Spiroisoindolines by [4+1] Cyclizations of γ‐Azidoboronic Acids with Cyclic
<i>N</i>
‐Sulfonylhydrazones
作者:Lucía López、María‐Paz Cabal、Carlos Valdés
DOI:10.1002/anie.202113370
日期:2022.1.10
N-sulfonylhydrazones of cyclic ketones are readily transformed into NH-free spirocyclic pyrrolidines and isoindolines by reaction with γ-azidoboronic acids. The transition-metal-free transformation is widely applicable and represents a new disconnection towards spirocyclic pyrrolidines. The application of the reaction in the modification of natural steroids and other biorelevant molecules highlights
A novel and simple t‐BuOLi/I2‐mediated synthesis of 1,2,4‐trisubstituted imidazoles was developed without transition‐metal added. The transition‐metal‐free strategy tolerated a range of substrates and provided products in moderate to good yields with 100% regioselectivity.
在不添加过渡金属的情况下,开发了新颖,简单的t- BuOLi / I 2介导的1,2,4-三取代咪唑合成方法。不含过渡金属的策略可耐受多种底物,并提供中等至良好产率的产品,区域选择性为100%。
The microwave-assisted ortho-alkylation of azine N-oxides with N-tosylhydrazones catalyzed by copper(<scp>i</scp>) iodide
作者:Abadh Kishor Jha、Nidhi Jain
DOI:10.1039/c5cc07833d
日期:——
A regioselective direct ortho-alkylation of azine N-oxides has been achieved under ligand-free conditions using copper(i) iodide and microwave conditions.