New Stereoselective Intramolecular [2 + 2] Cycloadditions between Ketenimines and Imines on an <i>o</i><i>rtho</i>-Benzylic Scaffold: 1,4-Asymmetric Induction
作者:Mateo Alajarín、Angel Vidal、Fulgencio Tovar、M. Carmen Ramírez de Arellano、Fernando P. Cossío、Ana Arrieta、Begoña Lecea
DOI:10.1021/jo0055178
日期:2000.11.1
Efficient 1,4-asymmetric induction has been achieved in the highly stereocontrolled intramolecular [2 + 2] cycloadditions between ketenimines and imines, leading to 1,2-dihydroazeto[2,1-b]-quinazolines. The chiral methine carbon adjacent to the iminic nitrogen controls the exclusive formation of the cycloadducts with relative trans configuration at C2 and C8. The stepwise mechanistic model, based on theoretical calculations, fully supports the stereochemical outcome of these cycloadditions.