Tenji Konishi

Novel diterpenes, excoecarins M and N from the resinous wood of Excoecaria agallocha

Abstract Two novel diterpenes, excoecarin M and N, were isolated from the resinous wood of Excoecaria agallocha. The structure determination was mainly based on 1D and 2D NMR spectroscopy. The structure of compound 2 was confirmed by X-ray analysis.

Tri-2-(2-phenylethyl)chromones from agalwood

Abstract Two new tri-2-(2-phenylethyl)chromones, tentatively named AH 19a and AH 19b , were isolated from agalwood ‘Jinkō’ and structurally characterized using 1 H and 13 C NMR spectra.

A 2,5-dimethoxytetrahydrofuran from Hemerocallis fulva var. kwanso

Abstract A 2,5-dimethoxytetrahydrofuran, fulvanol, has been extracted from Hemerocallis fulva var. kwanso along with fulvanines ‡ , 2,5-dihydrofuryl-γ-lactams. The structure of fulvanol has been established as 3-hydroxymethyl-2,5-dimethoxy-3,4-dihydroxytetrahydrofuran by the 1 H and 13 C NMR spectra. The structure of fulvanol is closely related to the branched-chain tetrofuranose apiose, occurring in the form of UDP-glycoside or as other cell components. [‡Fulvanines were first named for 2,5-dihydrofuryl-γ-lactam derivatives. The authors are concerned about possible confusion with fulvanin, cf. J. Nat. Prod. 56 , 527 (1993), which is a name given to a new sesquiterpene.]