Quinidine derived organocatalysts for the nucleophile promoted asymmetric [4+2] cycloaddition reaction of salicyl N-tosylimine with allenic esters
作者:Cheng-Kui Pei、Min Shi
DOI:10.1016/j.tetasy.2011.06.030
日期:2011.6
Cinchona alkaloid derived catalyst cat. 5 prepared fromβ-isocupreidine (β-ICD) was found to be a fairly effective organocatalyst for the nucleophilic promoted asymmetric [4+2] cycloaddition reaction of salicyl N-tosylimines and allenic esters to give the corresponding adducts in up to 80% yield, 87% ee.