Abstract
Among about 3000 macrocyclic compounds* isolated from various natural sources (macrolactames, macrolides, cyclic peptides, cyclic oligosaccharides etc.) about 100 compounds are macrocyclic diterpenoids.[1-3] The most famous are cembranes, jatrophanes, lathyranes; on the contrary, casbanes and dolabellanes are rather rare in nature.[1,3-7] Their carbohydrogen skeleton is 14-, 12, or 11membered cycle fused with cyclopropane, cyclopentane[1,3,6] or oxirane[7] rings. It should be emphasized that each naturally occurring macrocyclic diterpenoid is a one molecule (Scheme 1a). The literature has provided no examples of naturally
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