Peracid induced oxidative rearrangements of triterpenoids: Products of new skeleton from bauerenyl acetate
作者:Ajit Kumar Chakravarty、Binayak Das、Kazuo Masuda、Yoko Arai、Kenji Shiojima
DOI:10.1016/s0040-4020(98)00300-7
日期:1998.5
of bauerenyl acetate (2) with m-chloroperbenzoic acid at 4 °C yielded the migrated products, viz. 7α-hydroxy-14,27-cycloisoursan-3β-yl acetate (9) and its 15α-hydroxy derivative (12) belonging to a new skeleton, 7α-hydroxyisours-14-en-3β-yl acetate (10) and 14α,15α-epoxy-7α-hydroxyisoursan-3β-yl acetate (11), besides 7α,8α-epoxybaueran-3β-yl acetate (3), bauera-7,9(11)-dien-3β-yl acetate (4), bauera-6
bauerenyl乙酸乙酯(处理2)用米在4℃下氯过苯甲酸,得到迁移的产品,即 属于新骨架的7α-羟基-14,27-环异硫氰酸-3β-乙酸乙烯酯(9)及其15α-羟基衍生物(12),乙酸7α-羟基异硫醇14-en-3β-乙酸乙烯酯(10)和14α, 15α环氧7α-hydroxyisoursan-3β基乙酸酯(11),除了7α,8α-epoxybaueran-3β基乙酸酯(3),bauera -7,9(11) -二烯3β基乙酸酯(4), bauera-6,8-dien-3β-乙酸乙烯酯(5),7α,8α-epoxybauer-9(11)-en-3β-乙酸乙烯酯(6),7α,8α,9α,11α-二乙氧基baueran-3β-yl醋酸盐(7)和8α,9α-环氧-7α-羟基baueran-3β-乙酸乙烯酯(8)。主要根据2D NMR光谱分析来阐明所有产物的结构。醋酸鲍尔烯基酯(2)及其反应产物(3-12)的1