New triterpenes from barringtonia acutangula gaertn—III
作者:C.S. Prakasa Sastry、L. Ramachandra Row
DOI:10.1016/0040-4020(67)80031-0
日期:1967.1
From the wood of Barringtoniaacutangula Gaertn a new hexahydroxy triterpene, now named tanginol, is isolated besides β- and γ-sistosterols, barringtogenic acid and an unknown triterpene carboxylic acid (compound D).
From the heartwood of T. tomentosa Wight et Arn, β-sitosterol, oleanolic acid (VI, R = R1 = H), arjunolic acid (I) and barringtogenol (IV) were isolated and in addition a new tetrahydroxy triterpene mono-carboxylic acid, now named Tomentosic acid. The triacetylmethyl tomentosate was oxidized to the corresponding ketone (XV) which could be reduced by forced Wolff-Kishner method to give methyl arjunolate
从毛白杨的心材中提取β-谷固醇,齐墩果酸(VI,R = R 1= H),分离出壬酸(I)和巴丁香酚(IV),此外还分离了新的四羟基三萜单羧酸,现称为Tomentosic acid。将三乙酰基甲基绒毛酸酯氧化为相应的酮(XV),可以通过强制Wolff-Kishner方法将其还原,得到阿魏酸甲酯(III)。上述酮在碱的存在下也经历异构化,得到α,β-不饱和酮(XVI)。此外,在内酯化过程中,酸产生三羟基脱水内酯(X)。可以使用二氧化硒使三乙酰基甲酯脱水,得到甲基脱氢阿魏酸酯(XIX)。从这些反应中,将绒毛膜酸暂定为2α,3β,19β,23-四羟基-油烯-12-烯-28-油酸(XII,R = H)。
839. Barringtogenol and barringtogenic acid, two new triterpenoid sapogenins