Total Synthesis of the Cytostatic Marine Natural Product Dibromophakellstatin via Three-Component Imidazolidinone Anellation
作者:Michael Zöllinger、Peter Mayer、Thomas Lindel
DOI:10.1021/jo061813u
日期:2006.12.1
The tetracyclic pyrrole−imidazole alkaloid dibromophakellstatin from the marine sponge Phakellia mauritiana has been synthesized within seven steps from pyrrole in an 18% overall yield. The key step is a three-component assembly of a tricyclic enamide, a nitrene, and a carbamoyl building block, affording the imidazolidinone ring of dibromophakellstatin in one step. Notably, it is possible to employ
来自海洋海绵Phakellia mauritiana的四环吡咯-咪唑生物碱二溴环已抑菌素已从吡咯经七个步骤合成,总收率为18%。关键步骤是三环烯酰胺,腈和氨基甲酰基结构单元的三组分组装,一步即可得到二溴环己汀的咪唑烷酮环。值得注意的是,可以将具有双重功能的试剂EtO 2 CNHOTs用作亲电子腈和偶极氨基甲酰基组分的来源。使用脱溴的前体双吡咯并吡嗪酮可以提高高得率,并允许我们开发第二代合成方法。确认了二溴泛函他汀的细胞抑制活性。