Transformation of lignin model compounds to<i>N</i>-substituted aromatics<i>via</i>Beckmann rearrangement
作者:Yinling Wang、Yiman Du、Jianghua He、Yuetao Zhang
DOI:10.1039/c8gc00920a
日期:——
Here we present the highly effective cleavage of C–C bonds in lignin modelcompounds for the production of N-substituted aromatics in up to 96% total yield, including benzonitriles and amides, via oxime formation followed by Beckmann rearrangement (BR). The amides could be further hydrolyzed to anilines (>92% yield) and carboxylic acids (>90% yield), respectively. In addition, the employment of a substrate
Nickel-Catalyzed Synthesis of Oxazoles via C−S Activation
作者:Kyoungsoo Lee、Carla M. Counceller、James P. Stambuli
DOI:10.1021/ol900260g
日期:2009.3.19
The synthesis of 2-substituted oxazoles is achieved via nickel-catalyzed cross-couplingreaction of 2-methylthio-oxazole and various organozinc reagents. An extension of this method is demonstrated with a chemoselective, one-pot synthesis of unsymmetrical 2,5-disubstitutedoxazoles. This synthesis of 2- and 2,5-substituted oxazoles using this method provides great advantages over previous methods for