from Rhodomela confervoides. Its structure was elucidated by spectroscopic analysis. Both enantiomers of 1 were synthesized using a convergent strategy starting from d/l-pyroglutamic acids, respectively, allowing assignment of the R-configuration for the naturally occurring isomer by chiral HPLC analysis. Rhodomelin A represents the first example of a naturally occurring ureidopyrrolidone alkaloid incorporating
一种新型的
脲基
溴酚,红景天蛋白A(1),从红景天中得到了表征。通过光谱分析阐明了其结构。1的两个对映异构体分别使用收敛策略从d / l-焦谷
氨酸开始合成,并通过手性HPLC分析确定了天然异构体的R-构型。杜鹃花蛋白A代表掺入γ-
氨基
丁酸单元的天然
脲基
吡咯烷酮
生物碱的第一个实例。测定了1对
DPPH(1,1
-二苯基-2-
吡啶并
肼基)和
ABTS(2,2′-
叠氮基双(3-乙基
苯并噻唑啉-6-
磺酸根))的清除活性。