A New Pyrrole Synthesis via Silver(I)-Catalyzed Cycloaddition of Vinylogous Diazoester and Nitrile
摘要:
A new synthesis of di- and trisubstituted pyrroles was achieved by treating in situ generated vinylogous diazoesters and readily available nitriles with a catalytic amount of silver(I) antimony hexafluoride at room temperature. This method showcased the potential of utilizing silver(I) carbenoids in preparing heterocyclic compounds.
Regioselective Synthesis of Functionalized Pyrroles<i>via</i>Gold(I)-Catalyzed [3+2] Cycloaddition of Stabilized Vinyl Diazo Derivatives and Nitriles
作者:Giacomo Lonzi、Luis A. López
DOI:10.1002/adsc.201300346
日期:2013.7.8
The reaction of nitriles with alkenyldiazo compounds in the presence of gold catalysts provides functionalized pyrrole derivatives in moderate to high yields. This formal [3+2] cyclization reaction takes place with complete regioselectivity. The observed regiochemical outcome suggests the attack of the nitrile to the terminal position of the alkenylgold carbenoid (vinylogous reactivity). A broad range