Silver-Mediated Direct C–H Cyanation of Terminal Alkynes with N-Isocyanoiminotriphenylphosphorane
摘要:
A direct cyanation of terminal alkynes for the synthesis of propionitrile derivatives, with the aid of silver salt using water additive, has been achieved. The cyano source used is N-isocyanoiminotriphenylphosphorane, which is nontoxic, safe, and easy to handle. This protocol is characterized by its operational simplicity, high efficiency with excellent yields, broad substrate scope, and greater functional group tolerance.
A copper‐mediated synthesis of 2,3‐disubstituted benzofurans with the assistance of an 8‐aminoquinolyl auxiliary is described from readily available benzamides and benzoylacetonitriles. In this reaction, the C−C bond is successfully constructed viaC−H activation, and C−O bond is subsequently formed at the original position of the amide group in a one‐pot manner. The amide directinggroup is detached
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