Synthesis of cucurbitine derivatives: facile straightforward approach to methyl 3-amino-4-aryl-1-methylpyrrolydine-3-carboxylates
作者:Daniel Blanco-Ania、Pedro H.H. Hermkens、Leo A.J.M. Sliedregt、Hans W. Scheeren、Floris P.J.T. Rutjes
DOI:10.1016/j.tet.2009.04.059
日期:2009.7
A general three- or four-step synthesis of cis- and trans-substituted cucurbitine (3-aminopyrrolidine-3-carboxylic acid) derivatives from methyl 2-nitroacetate is reported. The first step utilizes a Knoevenagel condensation with five different aromatic imines or their corresponding aldehydes to form (Z/E)-mixtures of α-nitro acrylates. The second step gives rise to the pyrrolidine-core structures of