Palladium(II)-Catalyzed Cyclization Reaction of 2-(Alk-2′-ynyl- oxy)benzonitriles or 2-(Alk-2′-ynylamino)benzonitriles: A Facile Way to 2<i>H</i>-Chromene and 1,2-Dihydroquinoline Derivatives
作者:Guoqin Xia、Xiuling Han、Xiyan Lu
DOI:10.1002/adsc.201200445
日期:2012.10.8
2-dihydroquinolines from palladium(II)-catalyzed tandem reactions of 2-(alk-2′-ynyloxy)benzonitriles or 2-(alk-2′-ynylamino)benzonitriles was developed. This tandem reaction involves an intermolecular trans-acetoxypalladation of an alkyne followed by an addition to the nitrile group to quench the carbon-palladium bond and complete the catalytic cycle without the necessity of a redoxsystem.
Lewis acid-promoted site-selective cyanation of phenols
作者:Wu Zhang、Wen Yang、Wanxiang Zhao
DOI:10.1039/d0ob00737d
日期:——
An efficient Lewis acid-promoted site-selective electrophilic cyanation of 3-substituted and 3,4-disubstituted phenols has been developed. The cyanation reactions using MeSCN as the cyanating reagent proceeded efficiently to afford a wide range of 2-hydroxybenzonitriles with high efficiency and excellent regioselectivity. This protocol could provide a practical method for the synthesis and modification
A Catalytic Route to Ampakines and Their Derivatives
作者:Michael Mulzer、Geoffrey W. Coates
DOI:10.1021/ol200111a
日期:2011.3.18
A catalytic dominoreaction that efficiently provides access to an important class of heterocycles, the ampakines, is reported. Our approach is based on the cobalt-catalyzed hydroformylation of dihydrooxazines and allows for the facile synthesis of the pharmaceutically interesting compound CX-614 and related substances.