Highly stereoselective cycloadditions of Danishefsky's diene to (−)-8-phenylmenthyl and (+)-8-phenylneomenthyl glyoxylate N-phenylethylimines
作者:Xerardo García-Mera、Maria J. Alves、Albertino Goth、Maria Luísa do Vale、José E. Rodríguez-Borges
DOI:10.1016/j.tet.2013.02.027
日期:2013.4
4-oxo-pipecolic acid derivatives were obtained by double asymmetric induction aza-Diels–Alder reactions between chiral glyoxylate N-phenylethylimines and Danishefsky's diene mediated by zinc iodide. The key to success was the use of iminoacetates possessing two chiralauxiliaries, N-(S)- or N-(R)-1-phenylethyl and (−)-8-phenylmenthyl or (+)-8-phenylneomenthyl. Adducts were formed in good yields (78–81%), with complete