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
One-Pot Synthesis of 3-Substituted 2-Arylpyrrole in Aqueous Media via Addition–Annulation of Arylboronic Acid and Substituted Aliphatic Nitriles
作者:Md Yousuf、Susanta Adhikari
DOI:10.1021/acs.orglett.7b00490
日期:2017.5.5
Pd(II)-catalyzed C–C coupling reactions between substituted aliphatic nitriles and arylboronic acids followed by in situ cyclodehydration have been employed for the first time to synthesize a wide variety of 3-substituted 2-aryl-1H-pyrroles in aqueous acetic acid. This one-pot synthesis is green, and it conforms to atom economy. The structures of two representative pyrroles, 3k and 5f, were confirmed