Synthesis and analysis of compounds having the skeleton of ergot alkaloids with the nitrogen atom in the D-ring transposed
作者:Ioannis K. Stamos、Elyse A. Kelly、Heinz G. Floss、John M. Cassady
DOI:10.1002/jhet.5570320435
日期:1995.7
Alkylation-amination of the enamine 2 in the presence of ethyl α,α-bis(dibromomethyl)acetate, triethyl-amine, and methylamine lead to the construction of the aza-transposed ergoline 3. Sequential reduction, hydrolysis, reesterification, and indolization of 3, produced three diastereomers of 6. The structure of these three diastereomers was assigned on the basis of nmr and ir spectral analysis to be
在α,α-双(二溴甲基)乙酸乙酯,三乙胺和甲胺的存在下,烯胺2的烷基化胺化反应导致了氮杂转位麦角灵3的构建。依次还原,水解,再酯化和3的吲哚化,生成6的三个非对映异构体。根据核磁共振和红外光谱分析,将这三种非对映异构体的结构指定为(α-顺式)syn,(β-顺式)anti和(α- trans)syn。用氢化铝锂将异构体(β-顺式)抗氧化剂还原为相应的醇。