44 マツバボタン類縁植物のジテルペノイド成分と化学系統進化(口頭発表の部)

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Portulal 1 is a diterpene isolated from Portulaca grandiflora Hook. as a plant-growth regulator and have a unique [7.5]-ring system. From doubt to the proposed biosynthetic scheme and interest in the chemosystematics we have investigated extensively the constituents of related Portulaca species as well as the minor congeners of 1. From Portulaca grandiflora we characterized six compounds 2-7 with the [7.5]-ring system, in which four constituents were new, three compounds 8-10 with novel [7.6]-ring system, and one clerodane diterpene 11. For a gardening variant, P. cv. Jewel it is said that the consideration as an independent species would be pertinent from the standpoint of genetics. Examination of this plant disclosed the occurrence of trans-clerodane diterpenoids 12-16 ([6.6]-ring system) as major constituents and that of a diterpenoid 17 with [7.6]-ring system as minor one. This results strongly support the proposition that P. cv. Jewel should be an independent species. Next we examined the constituents of P. pilosa L. endemic to Iriomote island, Okinawa Pref.. We clarified the occurrence of three diterpenoids 19-21 with [7.6]-ring system in the aerial parts and that of three compounds 22-24 with [6.6]-ring system in the roots, a fact which would be biologically significant. P. cv. Jewel, P. pilosa and P. grandiflora have been disclosed to have the constituents with the biosynthetically more advanced structures in this order, which would imply the linear evolutional transition of the enzyme systems in Portulaca plants. At the same time we have proposed a chemically rational biosynthetic scheme based on the functionalization pattern of the diterpenoid components.
天然有機化合物討論会の論文
1995-09-01

44 マツバボタン類縁植物のジテルペノイド成分と化学系統進化(口頭発表の部)

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