Silver-Catalyzed Chemoselective [4+2] Annulation of Two Isocyanides: A General Route to Pyridone-Fused Carbo- and Heterocycles
作者:Zhongyan Hu、Jinhuan Dong、Yang Men、Zhichen Lin、Jinxiong Cai、Xianxiu Xu
DOI:10.1002/anie.201611024
日期:2017.2.6
silver‐catalyzed chemoselective [4+2] annulation of aryl and heteroaryl isocyanides with α‐substituted isocyanoacetamides was developed for the facile and efficient synthesis of 2‐aminoquinolones, naphthyridines, and phenanthrolines. A mechanism for this multistep domino reaction is proposed on the basis of a 13C‐labeling experiment, according to which an unprecedented chemoselective heterodimerization
开发了一种银催化的芳基和杂芳基异氰化物与α-取代异氰基乙酰胺的化学选择性[4 + 2]环合反应,可轻松高效地合成2-氨基喹诺酮,萘啶和菲咯啉。在13 C标记实验的基础上,提出了这种多步多米诺反应的机制,根据该机制,两种不同的异氰酸酯空前的化学选择性异二聚生成了α-氨基酮亚胺中间体,该中间体经历1,3-氨基迁移形成α -亚氨基酮基烯酮,然后进行6π电环化。