Mn(<scp>ii</scp>)/O<sub>2</sub>-promoted oxidative annulation of vinyl isocyanides with boronic acids: synthesis of multi-substituted isoquinolines
作者:Hao Wang、Yang Yu、Xiaohu Hong、Bin Xu
DOI:10.1039/c4cc06427e
日期:——
An efficient manganese(II)/O2-promoted oxidative radical cascade reaction was developed for the modular synthesis of multi-substituted isoquinolines from easily accessible vinyl isocyanides and boronic acids.
light-mediated facile synthesis of heteroarenes, namely, isoquinolines, benzothiazoles, and quinazolines, is demonstrated by employing isocyanides and inexpensive acyl peroxides. It is shown for the first time that singlet-excited isocyanides decompose acyl peroxides into aryl/alkyl radicals. The latter attack isocyanides, yielding imidoyl radicals that subsequently cyclize to afford heteroarene products. The
strategy for multi-substituted isoquinoline derivatives has been developed using visible light-promoted vinylisocyanideinsertion with diaryliodonium salts at room temperature. The methodology presented here represents the first example of isoquinoline synthesis via somophilicisocyanideinsertion.