Construction of Tetracyclic 3-Spirooxindole through Cross-Dehydrogenation of Pyridinium: Applications in Facile Synthesis of (±)-Corynoxine and (±)-Corynoxine B
作者:Jun Xu、Li-Dong Shao、Dashan Li、Xu Deng、Yu-Chen Liu、Qin-Shi Zhao、Chengfeng Xia
DOI:10.1021/ja5121343
日期:2014.12.31
A facile and straightforward method was developed to construct the fused tetracyclic 3-spirooxindole skeleton, which exists widely in natural products. The formation of the tetracyclic 3-spirooxindole structure was achieved through a transition-metal-free intramolecular cross-dehydrogenative coupling of pyridinium, which were formed in situ by the condensation of 3-(2-bromoethyl)indolin-2-one derivatives with 3-substituted pyridines. As examples of the application of this new methodology, two potentially medicinal natural products, (+/-)-corynoxine and (+/-)-corynoxine B, were efficiently synthesized in five scalable steps.