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From a 1-BuOH-soluble fraction of a MeOH extract of the leaves of M. japonica, collected in the Okinawa islands, six new ent-labdane glucosides, named microtropiosides A-F, were isolated together with one known acyclic sesquiterpene glucoside. The structures of the new compounds were elucidated by a combination of spectroscopic analyses, and their absolute configurations by application of the β-D-glucopyranosylation-induced shift-trend rule in the 13C NMR spectroscopy and the modified Mosher's method.

type:text, From the stems of Croton cascarilloides collected in the Okinawa Islands, a structurally rare crotofolane-type diterpenoid (1) and a rearranged nor-crotofalane, a new skeletal diterpenoid (2), were isolated. The structures were determined by X-ray crystallographic analyses, establishing their absolute stereostructures for the first time. Compound 2 was probably biosynthesized from 1 through several steps, such as decarboxylation, oxidation, C-C bond migration, etc.

type:text, Sixteen compounds were isolated from the MeOH extract of leaves of Myoporum bontioides. Of the compounds isolated, five were found to be new. Their structures were elucidated to be a chlorine-containing iridoid, named myopochlorin, and an iridoid glucoside, an acylated iridoid glucoside, a linear acetogenin glucoside, and an acyclic monoterpene glucoside, named myobontiosides A-D, respectively, by means of spectroscopic analyses.

type:text, From a MeOH extract of leaves of Grevillea robusta, seven compounds (1-7) were isolated. One known compound (7) was identified with a benzyl glucoside, icariside F2. The structures of six new compounds, named grevillosides A-F (1-6), were elucidated on detailed inspection of one- and two-dimensional NMR spectral data to be glucosides of 5-alkylresorcinols.

From a MeOH extract of leaves of Grevillea robusta, seven compounds (1-7) were isolated. One known compound (7) was identified with a benzyl glucoside, icariside F2. The structures of six new compounds, named grevillosides A-F (1-6), were elucidated on detailed inspection of one- and two-dimensional NMR spectral data to be glucosides of 5-alkylresorcinols.

Sixteen compounds were isolated from the MeOH extract of leaves of Myoporum bontioides. Of the compounds isolated, five were found to be new. Their structures were elucidated to be a chlorine-containing iridoid, named myopochlorin, and an iridoid glucoside, an acylated iridoid glucoside, a linear acetogenin glucoside, and an acyclic monoterpene glucoside, named myobontiosides A-D, respectively, by means of spectroscopic analyses.

From a MeOH extract of leaves of Grevillea robusta, seven compounds (1-7) were isolated. One known compound (7) was identified with a benzyl glucoside, icariside F2. The structures of six new compounds, named grevillosides A-F (1-6), were elucidated on detailed inspection of one- and two-dimensional NMR spectral data to be glucosides of 5-alkylresorcinols.

Sixteen compounds were isolated from the MeOH extract of leaves of Myoporum bontioides. Of the compounds isolated, five were found to be new. Their structures were elucidated to be a chlorine-containing iridoid, named myopochlorin, and an iridoid glucoside, an acylated iridoid glucoside, a linear acetogenin glucoside, and an acyclic monoterpene glucoside, named myobontiosides A-D, respectively, by means of spectroscopic analyses.

type:text, Three rearranged ent-kaurane diterpenes having the cafestol-type framework were isolated from the leaves of Tricalysia dubia. Two of them were found to be known diterpenoids, tricalysiolides B and C. Tricalysiolide B was isolated as colorless prisms in this experiment and its three dimensional structure was determined by X-ray crystallography. The remaining one was a new compound and named tricalysiolide G. Two new ent-kaurane-type diterpenoids, to which tricalysiols A and B were given as trivial names, were also isolated. The structures of the new compounds were elucidated from spectroscopic evidence.

Three rearranged ent-kaurane diterpenes having the cafestol-type framework were isolated from the leaves of Tricalysia dubia. Two of them were found to be known diterpenoids, tricalysiolides B and C. Tricalysiolide B was isolated as colorless prisms in this experiment and its three dimensional structure was determined by X-ray crystallography. The remaining one was a new compound and named tricalysiolide G. Two new ent-kaurane-type diterpenoids, to which tricalysiols A and B were given as trivial names, were also isolated. The structures of the new compounds were elucidated from spectroscopic evidence.

Three rearranged ent-kaurane diterpenes having the cafestol-type framework were isolated from the leaves of Tricalysia dubia. Two of them were found to be known diterpenoids, tricalysiolides B and C. Tricalysiolide B was isolated as colorless prisms in this experiment and its three dimensional structure was determined by X-ray crystallography. The remaining one was a new compound and named tricalysiolide G. Two new ent-kaurane-type diterpenoids, to which tricalysiols A and B were given as trivial names, were also isolated. The structures of the new compounds were elucidated from spectroscopic evidence.

From the stems of Croton cascarilloides collected in the Okinawa Islands, a structurally rare crotofolane-type diterpenoid (1) and a rearranged nor-crotofalane, a new skeletal diterpenoid (2), were isolated. The structures were determined by X-ray crystallographic analyses, establishing their absolute stereostructures for the first time. Compound 2 was probably biosynthesized from 1 through several steps, such as decarboxylation, oxidation, C-C bond migration, etc.

Sixteen compounds were isolated from the MeOH extract of leaves of Myoporum bontioides. Of the compounds isolated, five were found to be new. Their structures were elucidated to be a chlorine-containing iridoid, named myopochlorin, and an iridoid glucoside, an acylated iridoid glucoside, a linear acetogenin glucoside, and an acyclic monoterpene glucoside, named myobontiosides A-D, respectively, by means of spectroscopic analyses.

From a MeOH extract of leaves of Grevillea robusta, seven compounds (1-7) were isolated. One known compound (7) was identified with a benzyl glucoside, icariside F2. The structures of six new compounds, named grevillosides A-F (1-6), were elucidated on detailed inspection of one- and two-dimensional NMR spectral data to be glucosides of 5-alkylresorcinols.

Three rearranged ent-kaurane diterpenes having the cafestol-type framework were isolated from the leaves of Tricalysia dubia. Two of them were found to be known diterpenoids, tricalysiolides B and C. Tricalysiolide B was isolated as colorless prisms in this experiment and its three dimensional structure was determined by X-ray crystallography. The remaining one was a new compound and named tricalysiolide G. Two new ent-kaurane-type diterpenoids, to which tricalysiols A and B were given as trivial names, were also isolated. The structures of the new compounds were elucidated from spectroscopic evidence.