Facile access to optically active ring C aromatic diterpene derivatives from manool. Highly efficient syntheses of (+)-12-methyl-7-oxo-podocarpa-8,11,13-triene-13-carboxylic acid, (+)-13-methyl-7-oxopodocarpa-8,11,13-triene-12-carboxylic acid and (+)-nimbiol
摘要:
我们最近开发的策略的扩展,利用关键中间体2,该中间体可通过两步反应(总体收率52%)从马诺醇1获得,对天然存在的C环芳香二萜衍生物的合成提供了在三步内合成(+)-12-甲基-7-氧基波多卡尔帕-8,11,13-三烯-13-羧酸4b及其异构体6b,并且在七步内合成(+)-宁比醇11b,均获得了良好的总体收率。这一合成揭示了分配给从印度苦楝(Azadirachta indica A. Juss)中分离的马戈隆4b的结构是错误的,需要重新调查。
This paper describes the use of (−)-sclareol in the synthesis of the tricyclic diterpenes of abietane skeleton, such as (+)-ferruginol and (+)-sugiol, using as key step the lateral lithiation of a dinorditerpene derivative.
Constituents of the trunk bark of Melia azadirachta Linn. and the structure of the ketophenol, nimbiol
作者:P. Sengupta、S.N. Choudhuri、H.N. Khastgir
DOI:10.1016/0040-4020(60)85006-5
日期:1960.1
the trunkbark of MeliaazadirachtaLinn. have been isolated a branched chain paraffin alcohol, C26H54O, nimbosterol, sugiol (I, R = H) and a new ketophenol, nimbiol having the molecular formula, C18H24O2. Nimbosterol has been identified as β-sitosterol and nimbiol has been shown to possess the structure (II, R = H). The biogenetic considerations for the possible formation of sugiol and nimbiol in the
从Melia azadirachta Linn的树干树皮中。已经分离出支链石蜡醇,C 26 H 54 O,尼莫甾醇,sugiol(Ⅰ,R = H)和一种新的酮酚,尼莫酚,其分子式为C 18 H 24 O 2。己烯醇被鉴定为β-谷甾醇,而己烯醇被显示具有该结构(II,R = H)。还讨论了在同一植物中可能形成sugiol和nimbiol的生物遗传学考虑。
Choudhuri et al., Chemistry and Industry, 1959, p. 634