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一、引言二萜生物碱是一类四环二萜化合物的含氧衍生物。一般分为C_(19)和C_(20)两大类基本骨架,C_(19)又细分为乌头碱(aconitine)型(Ⅰ),牛扁碱(lcoctonine)型(Ⅱ)和内酯型(lactone)。在国内天然植物中所含的二萜生物碱主要是C_(19)类基本骨架。目前国内外已发现天然二萜生物碱近300种,国内百余种。C_(19)类的乌头碱型与牛扁碱型在~(13)C NMR谱上的重要区别就在于后者的C_7位移比前者的C_7位移至少高40 ppm以上,因为乌头碱型C_7上无含
I. Introduction Diterpene alkaloids are a class of tetracyclic diterpene compounds containing oxygen derivatives. It is divided into C 19 and C 20 basic skeletons. C 19 is subdivided into aconitine type Ⅰ, lcoctonine type Ⅱ and lactone. Lactone. The diterpenoid alkaloids contained in natural plants in China are mainly C 19 type basic skeletons. At home and abroad have found nearly 300 kinds of natural diterpene alkaloids, more than 100 kinds of domestic. The main difference between the ~ (13) C NMR spectrum of aconitine and bovine platen in the C_ (19) class is that the C_7 displacement of the latter is at least 40 ppm higher than the C_7 displacement of the former because aconitine Not included on C_7