Anisotomenes, bicyclic irregular diterpenes found in the genus Anisotome(family Apiaceae), are shown to be products of a unique biosynthetic pathway, involving head-to-head coupling of two geranyl diphosphate units. (13)C labelling studies with [1-(13)C]-glucose on plantlets of A. lyallii also
A chemosystematic HPLC-UV and HPLC-MS investigation of New Zealand members of the Apiaceae was performed. Diterpenes were identified and quantified in methanolic extracts from subaerial parts of 28 taxa and 54 samples of Aciphylla, Anisotome, Apium, Gingidia, Lignocarpa, Oreomyrrhis, and Scandia.
Several Anisotomediterpene derivatives were synthesized in an attempt to obtain a crystalline compound for X-ray analysis. Although we were unable to obtain a suitable crystal, the absolute configuration of the irregular diterpene skeleton was determined using two other techniques: a circular
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