A novel chiral pyrrolizidine base 5 derived from L-proline promotes the Baylis–Hillman reaction of ethyl and methyl vinyl ketones with electron deficient aromatic aldehydes with moderate levels of enantiomeric excess.
A. G. M. Barrett, A. S. Cook and A. Kamimura, Chem. Commun., 1998, 2533 DOI: 10.1039/A806115G
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