Palladium-Catalyzed Cascade Reactions of Isocyanides with Enaminones: Synthesis of 4-Aminoquinoline Derivatives
作者:Zheng-Yang Gu、Tong-Hao Zhu、Jia-Jia Cao、Xiao-Ping Xu、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/cs400904t
日期:2014.1.3
A method for palladium-catalyzed cascade reactions of isocyanides with enaminones has been developed. This methodology provides a direct approach to 4-aminoquinoline derivatives under mild conditions with up to 98% yields.
I2/DMSO-mediated substrate selective oxidation of tetrahydro indole-2,4-dione towards 4-hydroxy isatins and 5,6-dihydro-1H-indole-2,4-dione derivatives
indole-2,4-diones from readily available β-enaminones and glyoxal and subsequent I2/DMSO-mediated oxidation/aromatization of tetrahydro indole-2,4-dione to produce 4-hydroxyisatin derivatives. The key aspect of this protocol includes the dual catalytic activity of molecular iodine in the presence of DMSO. Mechanistic study suggested that this reaction is substrate selective as corresponding aromatization