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) .
Neves Filho, R. A. W., Westermann, B., & Wessjohann, L. A. (2011). Synthesis of (-)-julocrotine and a diversity oriented Ugi-approach to analogues and probes. Beilstein Journal of Organic Chemistry, 7, 1504–1507. https://doi.org/10.3762/bjoc.7.175