Mild and Phosphine-Free Iron-Catalyzed Cross-Coupling of Nonactivated Secondary Alkyl Halides with Alkynyl Grignard Reagents
作者:Chi Wai Cheung、Peng Ren、Xile Hu
DOI:10.1021/ol501087m
日期:2014.5.2
cross-coupling of nonactivated secondary alkylbromides and iodides with alkynyl Grignardreagents at room temperature has been developed. A wide range of secondary alkyl halides and terminal alkynes are tolerated to afford the substituted alkynes in good yields. A slight modification of the reaction protocol also allows for cross-coupling with a variety of primary alkyl halides.
Divergent Asymmetric Synthesis of Polycyclic Compounds via Vinyl Triazenes
作者:David Kossler、Florian G. Perrin、Abdusalom A. Suleymanov、Gregor Kiefer、Rosario Scopelliti、Kay Severin、Nicolai Cramer
DOI:10.1002/anie.201706013
日期:2017.9.11
triazenes were obtained by enantioselective [2+2] cycloaddition reactions of bicyclicalkenes with 1-alkynyl triazenes in the presence of a RuII catalyst with a chiral cyclopentadienyl ligand. These triazenes serve as unique vinyl cation surrogates. Under acidic conditions, the triazene functionality can be replaced with a variety of groups, including halides, alkoxides, sulfoxides, amides, arenes, and