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
据报道,一般由2-硝基乙酸甲酯合成顺式和反式取代的葫芦素(3-氨基吡咯烷-3-羧酸)衍生物的三步或四步。第一步利用Knoevenagel与五个不同的芳族亚胺或其相应的醛缩合形成α-硝基丙烯酸酯的(Z / E)混合物。第二步通过使用偶氮甲碱叶立德的1,3-偶极环加成反应产生标题化合物的吡咯烷核心结构。最后一步包括还原硝基以产生相应的4-芳基南瓜碱甲酯的两种非对映异构体。