An improved total synthesis of (−)-julocrotine in three steps from Cbz-glutamine, in 51% overall yield, is presented. To demonstrate the potential of the heterocyclic moiety for diversity oriented synthesis, a series of (−)-julocrotine analogues was synthesized by employing the heterocyclic precursor as an amino input in Ugi four-component reactions (Ugi-4CR) Hulme, C.; Dietrich, J. Mol. Diversity 2009, 13, 195–207. doi:10.1007/s11030-009-9111-6.
从Cbz-谷氨酰胺经过三步改进的合成方法,总产率为51%,制备了(-)-julocrotine。为了展示杂环基团对多样化合成的潜力,通过在Ugi四组分反应中使用杂环前体作为氨基输入,合成了一系列(-)-julocrotine类似物。Hulme, C.; Dietrich, J. Mol. Diversity 2009, 13, 195–207. doi:10.1007/s11030-009-9111-6。