Copper-Catalyzed Cascade Synthesis of 2-Aryl-3-cyanobenzofuran and Dibenzo[<i>b</i>,<i>f</i>]oxepine-10-carbonitrile Derivatives
作者:Bharath Kumar Villuri、Sachin S. Ichake、Sabbasani Rajasekhara Reddy、Veerababurao Kavala、Vijayalakshmi Bandi、Chun-Wei Kuo、Ching-Fa Yao
DOI:10.1021/acs.joc.8b01443
日期:2018.9.7
The copper-catalyzed reaction of aryl aldehydes with 2-iodobenzylcyanides afforded 2-aryl-3-cyanobenzofurans in isolated yields of up to 74% in a cascade manner, which involves Knoevenagel condensation, aryl hydroxylation, oxa-Michael addition, and aromatization reactions. Conversely, 2-halo benzaldehydes as reacting partners with 2-iodobenzylcyanide regioselectively furnished dibenzo[b,f]oxepine-10-carbonitrile
One-Pot Transition-Metal-Free Synthesis of Dibenzo[<i>b</i>,<i>f</i>]oxepins from 2-Halobenzaldehydes
作者:Young Lok Choi、Hye Sun Lim、Hwan Jung Lim、Jung-Nyoung Heo
DOI:10.1021/ol302371s
日期:2012.10.5
A one-pot transition-metal-free, base-mediated synthesis of dibenzo[b,f]oxepins was developed. The reaction of 2-halobenzaldehydes with (2-hydroxyphenyl)acetonitriles proceeds via a sequential aldol condensation and intramolecular ether formation reaction in the presence of Cs2CO3 and molecular sieves in toluene.