Pummeloquinone (1), the third example of a coumarin-naphthoquinone dimer from a natural source, was isolated form the roots of several hybrid seedlings resulting from a cross of May pummelo x Marsh grapefruit (Rutaceae) grown in an orchard at Okitsu, Shizuoka, and its structure was elucidated by chamical and spectrometric methods. Synthesis of 1 was also achieved by Diels-Alder reaction between trans-dehydroosthol (3) and 2-methoxy-1, 4-benzoquinone followed by 2, 3-dichloro-5, 6-dicyano-1, 4-benzoquinone (DDQ) oxidation.
在静冈县冲津市的一个果园里,从五月柚与沼泽柚(芸香科)杂交产生的几株杂交秧苗的根部分离出了
香豆素-
萘醌二聚体(1),并通过色谱法和光谱法阐明了其结构。通过反式脱氢
甾醇(3)和 2-甲氧基-1,4-苯醌(2,3-二
氯-5,6-二
氰基-1,4-苯醌(
DDQ)氧化后的 Diels-Alder 反应也合成了 1。