Medium-Ring Nitrogen Heterocycles through Migratory Ring Expansion of Metalated Ureas
作者:Jessica E. Hall、Johnathan V. Matlock、John W. Ward、Katharine V. Gray、Jonathan Clayden
DOI:10.1002/anie.201605714
日期:2016.9.5
benzo‐fused nitrogen heterocycles (indolines, tetrahydroquinolines, and their homologues) undergo migratory ring expansion through deprotonation of their benzylic urea derivatives with lithium diisopropylamide (LDA) in the presence of N,N′‐dimethylpropylideneurea (DMPU). The products of the reactions are benzodiazepines, benzodiazocines, and their homologues, with ring sizes of 8–12. The reactions tolerate a