申请人:The Trustees of Columbia University in the City of New York
公开号:US06197954B1
公开(公告)日:2001-03-06
The synthesis of C11N5 marine sponge alkaloids (±)-hymenin (1), stevensine (2), hymenialdisine (3), and debromohymenialdisine (4) is described. These natural products are the primary family members of the sponge metabolites that contain a fused pyrrolo[2,3-c]azepin-8-one ring system with either a 2-aminoimidazole (AI) or glycocyamidine appendage. The key steps in the synthesis centered around the generation of novel azafulvenium ions and their regioselective heterodimerization with AI in order to create the tricyclic core. A rarely used protodebromination/oxidation strategy was employed to selectively generate the desired a-bromo substitution pattern seen in hymenialdisine (3). In addition, the AI moiety was shown to be a useful precursor to the glycocyamidine unit found in 3 and 4, which suggests that AI derived natural products may be the biogenic forerunners to glycocyamidine metabolites.
本文描述了C11N5海绵生物碱(±)-hymenin(1)、stevensine(2)、hymenialdisine(3)和debromohymenialdisine(4)的合成。这些天然产物是含有融合的吡咯[2,3-c]氮杂环-8-酮环系和2-氨基咪唑(AI)或甘氨酰胺补集的海绵代谢物的主要成员。合成的关键步骤围绕着产生新型氮杂富烯离子及其与AI的选择性异二聚化以创建三环核心。采用很少使用的质子去溴/氧化策略选择性地产生了hymenialdisine(3)中所见的所需的a-溴代替模式。此外,AI基团被证明是3和4中发现的甘氨酰胺单元的有用前体,这表明以AI为来源的天然产物可能是甘氨酰胺代谢物的生物前体。