Chemoselective Double Annulation of Two Different Isocyanides: Rapid Access to Trifluoromethylated Indole-Fused Heterocycles
作者:Yuelei Gao、Zhongyan Hu、Jinhuan Dong、Jun Liu、Xianxiu Xu
DOI:10.1021/acs.orglett.7b02582
日期:2017.10.6
chemoselective double annulation of α-trifluoromethylated isocyanides with o-acylaryl isocyanides has been developed. This new reaction provides a rapid, efficient, and complete atom-economic strategy for the synthesis of trifluoromethylated oxadiazino[3,2-a]indoles in a single operation from readily available starting materials. Isocyanide insertion into C═O double bonds is disclosed for the first
已经开发出空前的α-三氟甲基化异氰酸酯与邻酰基芳基异氰酸酯的化学选择性双环。该新反应提供了快速,有效和完整的原子经济策略,可通过一次操作从容易获得的起始原料合成三氟甲基化的恶二嗪并[3,2- a ]吲哚。由18 O-标记实验的结果表明,异氰酸酯首次插入C = O双键。提出了这种多米诺反应的机制,其中包括两种不同异氰酸酯的化学选择性异二聚化,然后是吲哚-2,3-环氧化物的形成和重排。