Yi-Yuan Shao

Chemical constituents of Antrodia camphorata submerged whole broth.

One new compound, 10-hydroxy-γ-dodecalactone (1) and three natural new compounds, 11-hydroxy-γ-dodecalactone (2), 2-(2-hydroxyethyl)phenol (3) and 12-hydroxydodecanoic acid methyl ester (4), together with eight known compounds, ergostatrien-3β-ol, ergosterol peroxide, methyl (4-hydroxyphenyl)acetate, vanillin, 4-hydroxybenzaldehyde, hexadecanoic acid, 5-methoxymethylfuran-2-carbaldehyde and 5-hydroxymethylfuran-2-carbaldehyde, all were isolated from the submerged whole broth of Antrodia camphorata. The structures of 1 and 2 were principally elucidated by spectral evidence and the absolute configuration was elucidated by the modified Moshers method.

A new labdane-type diterpene from the bark of Juniperus chinensis Linn.

From the bark of Juniperus chinensis Linn., a new labdane-type diterpene, methyl 14,15-dihydroxy-8(17),12E-labdadien-19-oate (1a), together with nine known compounds, trans-communic acid, cis-communic acid, 15,16-bisnor-13-oxo-8(17),11E-labdadien-19-oic acid, sandaracopimaric acid, 7-oxosandaracopimaric acid, sugiol, 7-oxototarol, α-cedrol and β-sitosteryl-1-O-β-glucopyranoside were isolated. The structures of those compounds were elucidated based on spectral analysis and chemical evidences.

New Lignans from the Heartwood of Cunninghamia lanceolata

Two new lignans, including the aryltetralin-type lignan, lanceoline (1), and the diaryl butyrolactone-type lignan, 5-methoxytrachelogenin (2), together with 5-methoxywikstromol (3), were isolated from the low-polar layer of a heartwood extract of Cunninghamia lanceolata as their acetylated derivatives 1a, 2a and 3a, respectively, and were identified by spectroscopic analyses. The 13C-NMR data for 3a are reported for the first time in this paper.

Ficuschlorins A – D, Lactone Chlorins from the Leaves of Ficus microcarpa

Four new lactone chlorins, ficuschlorins A – D (1–4, resp.), and six known pheophytins were isolated from the leaves of Ficus microcarpa. The structures of these compounds were determined by 1D‐ and 2D‐NMR spectroscopy, and other techniques. New natural pheophytins were rarely obtained. In the past ten years, only three new pheophytins were isolated from natural sources.

Three new triterpenes from the roots of Rhus javanica L. var. roxburghiana

Three new triterpenes, lantabetulal (1), lantanolal (2), and lantanolol (3) along with lantabetulic acid (4) and lantanolic acid (5) were isolated from the roots of Rhus javanica L. var. roxburghiana. The structural assignments of all these compounds were carried out by their spectroscopic analysis.