Gold-Catalyzed Nitrene Transfer to Activated Alkynes: Formation of α,β-Unsaturated Amidines
摘要:
A gold-catalyzed intermolecular nitrene transfer to alkynes was developed for the first time, revealing a new mode of nitrene transfer and providing a novel access to versatile alpha-imino metal carbenes. Various mild nitrene-transfer reagents were examined, and iminopyridium ylides especially those based on 3,5-dichloropyridine proved be highly effective. With activated alkynes such as N-alkynyloxazolidinones as substrates, alpha,beta-unsaturated amidines were formed in mostly good yields.
Iridium(III)-Catalyzed Regioselective B(4)–H Amination of <i>o</i>-Carboranes with Sufilimines
作者:Kyeongna Park、Gi Uk Han、Sugyeong Yoon、Eunseo Lee、Hee Chan Noh、Kyungsup Lee、Chanyoung Maeng、Dongwook Kim、Phil Ho Lee
DOI:10.1021/acs.orglett.3c02114
日期:2023.8.18
Iridium(III)-catalyzed regioselective B(4)–H amination is developed from the reaction of o-carborane acids with sulfilimines without any oxidants under mild conditions, which leads to a wide range of B(4)–H aminated o-carboranes in good yields with a broad substrate scope. Moreover, the selective B(3,6)-diamination reaction of the o-carborane acid was achieved. The present reaction is attractive from