The Iridium-catalyzed enantioselective couplingreaction of vinyl azides and allylic electrophiles is presented and provides access to β-chiral carbonyl derivatives. Vinyl azide are used as acetamide enolate or acetonitrile carbanion surrogates, leading to γ,δ-unsaturated β-substituted amides as well as nitriles with excellent enantiomeric excess. The products are readily transformed into chiral N-containing
Electrochemical regioselective azidoiodination of alkenes
作者:Wei-qing Yan、Meng-ying Lin、R. Daniel Little、Cheng-Chu Zeng
DOI:10.1016/j.tet.2016.12.058
日期:2017.2
An efficient electrochemical approach to the vicinal iodoazides has been developed through constant current electrolysis of alkenes with NaN3 and NaI in methanol. The reaction is proposed to proceed via a cyclic iodonium intermediate and thereby gives Markovnikov addition products exclusively.
functionalized quinolines and pyridines could be synthesized by BF3⋅OEt2‐mediated reactions of vinylazides with N‐aryl and N‐alkenyl aldimines, respectively. The reaction mechanism could be characterized as formal [4+2]‐annulation, including unprecedented enamine‐type nucleophilic attack of vinylazides to aldimines and subsequent nucleophilic cyclization onto the resulting iminodiazonium ion moieties.