Chiroptical Analysis of Marine Sponge Alkaloids Sharing the Pyrrolopyrazinone Core
作者:Delphine E. N. Jacquot、Peter Mayer、Thomas Lindel
DOI:10.1002/chem.200305392
日期:2004.3.5
A systematic experimental study has been conducted on the chiroptical properties of bi- and tricyclic pyrrolopyrazinones, which occur as the core in a variety of marine pyrrole-imidazole alkaloids, such as the immunosuppressive palau'amine. On the basis of the chiral-pool synthesis of conformationally fixed dipyrrolopyrazinones, it was possible to predict the CD spectrum of (-)-dibromophakellin above
已对双环和三环吡咯并吡嗪并酮的手性进行了系统的实验研究,双环和三环吡咯并吡喃并酮是多种海洋吡咯-咪唑生物碱(如免疫抑制性帕劳胺)的核心。基于构象固定的双吡咯并吡嗪酮的手性池合成,可以预测(-)-二溴代邻苯三酚在240nm以上的CD光谱。2,2,2-三氟乙醇被确定为该分析的优良溶剂。250 nm处棉花的正效应可用于确定二溴吡咯并吡嗪酮的螺旋度,而285 nm处的棉花效应的强度则由相对立体化学决定。吡咯环的溴化的影响也变得可预测。三轮车之一可以被视为“