Amino acid derived 3-pyrrolines can be readily prepared in a single step in enantiomerically pure form by cycloalkylation of the corresponding amino esters with (Z)-1,4-dichloro-2-butene. Enantiopure azabicyclo[3.3.0]octenones can be then easily obtained through an unprecedented Pauson-Khand reaction followed by diastereomer separation.
F. Cuevas, C. García-Granda, H. Buschmann, A. Torrens, S. Yenes, M. A. Pericàs
Synlett 2007, 119-122
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