Two diacyl rhamnopyranosylcatalpols were isolated from the leaves of Premna japonica. The structures of the compounds were determined to be 6-O-α-L-(2"-O-isoferuloyl, 4"-O-acetyl)rhamnopyranosylcatalpol and 6-O-α-L-(3"-O-isoferuloyl, 4"-O-acetyl)rhamnopyranosylcatalpol. The locations of acyl moieties were determined by long-range proton selective decoupling experiments and by partial alkaline hydrolysis.
从白花蛇舌草(Premna japonica)的叶子中分离出了两种二酰基
鼠李糖基宿主
酚。化合物的结构被确定为 6-O-α-L-(2"-O-异阿魏酰,4"-O-乙酰基)rhamnopyranosylcatalpol 和 6-O-α-L-(3"-O-异阿魏酰,4"-O-乙酰基)rhamnopyranosylcatalpol。酰基的位置是通过长程质子选择性解偶联实验和部分碱性
水解来确定的。