作者:Gui Liu、Ralph Müller、Peter Rüedi
DOI:10.1002/hlca.200390043
日期:2003.2
phytochemical work on Plectranthus ambiguus (Lamiaceae) afforded a series of tetracyclic phyllocladane-type (=13β-kaurane) diterpenoids (see 1a–f). In the course of investigations concerning the reaction behavior of this rare natural-products, a new constituent of P. ambiguus was isolated, (2S,3R,16R)-phyllocladane-2,3,16,17-tetrol 2,3-diacetate (1g), and another eighteen new phyllocladanes were prepared by
在早期的植物化学物质工作左手疑(唇形科),得到一系列四环phyllocladane型(= 13的β -kaurane)二萜类化合物(参见1A - ˚F)。在关于这种罕见的天然副产物的反应行为的调查过程中,新组成P.疑分离,(2小号,3 - [R,16 - [R)-phyllocladane-2,3,16,17四醇2,通过化学转化制备了3-diacetate(1g)和另外18种新的叶绿素,并对其进行了表征。主要成分1B的P.疑将其化学转化为已知的天然二萜类卡尔替潘酮(=(16 R)-16,17-dihydroxyphyllocladan-3-one; 2),从而明确确定其结构(方案1)。在C(16)上通过环氧衍生物20的差向异构化产生16-epicalliterpenone(21),17-hydroxyphylloclad-15-ene-3-one(22)和(16 R)-3-oxophyllocladan-17-al(23)。