Catalytic Divergent Synthesis of 3<i>H</i> or 1<i>H</i> Pyrroles by [3 + 2] Cyclization of Allenoates with Activated Isocyanides
作者:Jia-Yu Liao、Pan-Lin Shao、Yu Zhao
DOI:10.1021/ja511895q
日期:2015.1.21
The cyclization of allenoates with activated isocyanides was reported for the first time. While Ag catalysis led to an unprecedented enantioselective synthesis of 3H pyrroles, a simple procedure using PPh3 produced a wide range of polysubstituted 1H pyrroles with high efficiency.
Divergent, Enantioselective Synthesis of Pyrroles, 3<i>H</i>
-Pyrroles and Bicyclic Imidazolines by Ag- or P-Catalyzed [3+2] Cycloaddition of Allenoates with Activated Isocyanides
The divergent, stereoselective formal [3+2] cycloadditions of allenoates with activated isocyanides catalyzed by silver or phosphine‐based catalysts were investigated. Silver catalysis is capable of delivering a range of 3H‐pyrroles in high stereoselectivities. These enantioenriched heterocycles can either undergo sequential cyclisation with isocyanoacetates to deliver unprecedented bicyclic imidazolines