An integrated approach to the synthesis of contiguously substituted xanthopurpurins, pachybasins and purpurins.
摘要:
Alkylation, hydroxyalkylation and acylation of 3-methyl-, 3-methoxy- and 3,4-dimethoxycrotonates can be induced to occur exclusively in the alpha-Position. Conversion of the products to dienes then provides, through cycloaddition, a wide variety of substitution patterns. This approach is illustrated by simplified syntheses of a number of naturally occurring quinones and confirms the structures proposed for vismiaquinone C, 7-geranylemodin, cinnalutein, 4,5-dihydroxydigitolutein, 2-hydroxyislandicin 1-methyl ether and calyculatone 1-methyl ether.
Prenylated bianthrones and vismione F from Psorospermum febrifugum
作者:B. Botta、F. Delle Monache、G. Delle Monache、G.B. Marini Bettolo、J.D. Msonthi
DOI:10.1016/s0031-9422(00)84902-x
日期:1985.1
Abstract The roots of Psorospermumfebrifugum collected in Malawi contained together with the known vismione D and geranyloxyemodin four new compounds: vismione F and the three bianthrones A 1 , A 3a and A 3b . All the isolated compounds contained C- or O-geranyl substituents and showed a close biogenetic relationship.
摘要 在马拉维采集的Psorospermum febrifugum 根中,除已知的vismione D 和geranyloxyemodin 外,还含有四种新化合物:vismione F 和三种双酮A 1 、A 3a 和A 3b 。所有分离的化合物都含有C-或O-香叶基取代基,并显示出密切的生物遗传关系。