Exploration of the Electrophilic Reactivity of the Cytotoxic Marine Alkaloid Discorhabdin C and Subsequent Discovery of a New Dimeric C-1/N-13-Linked Discorhabdin Natural Product
作者:Cary F. C. Lam、Melissa M. Cadelis、Brent R. Copp
DOI:10.3390/md18080404
日期:——
dienone moiety of discorhabdin C on cytotoxicity, a semi-synthetic hydrogenation derivative was prepared, affording a didebrominated ring-closed carbinolamine that was essentially devoid of tumour cell line cytotoxicity. Antiparasitic activity was assessed for a set of 14 discorhabdin alkaloids composed of natural products and semi-synthetic derivatives. Three compounds, (-)-discorhabdin L, a dimer of discorhabdin
具有细胞毒性的海洋天然产物discorhabdin C包含一个2,6-二溴-环己-2,5-二烯部分,以前被认为是生物活性所必需的关键特征。我们已经确定Discorhabdin C的二烯酮环确实是亲电子的,可与硫醇和胺亲核试剂反应,得到脱溴的加合物。在与1-氨基戊烷反应的情况下,产物包含不寻常的C-2 / N-18闭环双水合物部分。这种亲电子反应性也扩展到蛋白质上,通过ESI质谱检测到了溶菌酶-去铁蛋白C加合物。这些结果促使进一步检查产discorhabdin C的海绵提取物Latrunculia(Latrunculia)trivetricillata,导致了C-1 / N-13连接的discorhabdin二聚体新实例的分离和表征,该实例与1-氨基戊烷-discorhabdin C加合物具有相似的结构。为了确定性地评估discorhabdin C的二烯酮部分对细胞毒性的影响,制备了半合成氢