【摘要】 从卢氏香茶菜叶的乙醚提取物中分得一个新的二萜化合物,卢氏香茶菜乙素(ludongnin B),其结构经各项光谱数据确定为(1)式。更多还原

【Abstract】 Rabdosia rubescens Hara var. lushiensis Gao et Li(Labiatae) which is widely distributed in the Funiushan west area of Henan, has been used for the treatment of esphagel and cardial carcinoma in Henan, We have reported the isolation and the structural determination of ludongnin A from the ethereal extract of the dry leaves of this plant. The present paper, we report studies on a new crystalline diterpenoid, ludongnin B [C20H28O5, mp 296-9 ℃] which is a minor component isolated from the same plant and its structure has been shown to be ent- 6 , 7 -spiroseco- 7 , 20-δ -lactonic ring-6, 19- γ -lactonic ring-16-kaurane-15-one ( 1 ) on the basis of spectroscopic evidence and compared with known compound, ludongnin A.更多还原