α-Aminoester-Derived Imidazoles by 1,5-Electrocyclization of Azavinyl Azomethine Ylides
作者:Orazio A. Attanasi、Emilia Caselli、Paolo Davoli、Gianfranco Favi、Fabio Mantellini、Claudia Ori、Fabio Prati
DOI:10.1021/ol901051z
日期:2009.7.2
is described. The overall sequence features a Michael-type conjugate addition between the α-amino ester and the DD, followed by iminium ion formation via condensation with the aldehyde and 1,5-electrocyclization of the resulting thermally generated azavinyl azomethine ylide to afford eventually α-imidazol-1-yl esters. Such a protocol allows access to enantiomerically pure imidazoles from optically