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Four novel lactams, colletotrilactam A-D (1-4), along with six known compounds (5-10) were isolated from the culture broth of Colletotrichum gloeosporioides GT-7, a fungal endophyte of Uncaria rhynchophylla. The structures of these compounds were elucidated by comprehensive NMR spectroscopy. Isolates were tested for monoamine oxidase (MAO) inhibitory activity and compound 9 showed potent MAO inhibitory activity with IC50 value of 8.93±0.34μg/mL, when the IC50 value of iproniazid as a standard was 1.80±0.5μg/mL.
Phytochemical investigation on <b>Asterothamnus centrali-asiaticus</b> afforded four new sesquiterpenes, asterothamnones A-D (<b>1</b>-<b>4</b>), and three new benzofuran derivatives (<b>5</b>-<b>7</b>) together with ten known compounds (<b>8</b>-<b>17</b>). Their structures were elucidated using 1D and 2D NMR and X-ray diffraction analyses. Compounds <b>1</b>-<b>4</b> were verified to be unusual eudesmane sesquiterpenes possessing 4,6-dien-3-one or 1,4,6-triene-3-one conjugated system. The absolute configurations of compounds <b>1</b>-<b>8</b> were established by means of calculated electronic circular dichroism (ECD). Furthermore, all isolates were evaluated for their cytotoxic and anti-oxidant activities. Results showed that <b>10</b>, <b>12</b> and, <b>14</b> exhibited cytotoxic activity against HepG2 cancer cells and <b>14</b> displayed cytotoxicity against MGC-803 cancer cells. Compounds <b>10</b> and <b>17</b> showed anti-oxidant effect.<br><br>Display Omitted
Two new compounds, deacetylisowortmins A (1) and B (2), were isolated from Talaromyces wortmannii LGT-4. Their structures were established by 1D and 2D NMR spectra, as well as comparison of the experimental and calculated electronic circular dichroism spectra. Monoamine oxidase and acetylcholinesterase inhibitory activities of 1 and 2 were also evaluated.
Two new compounds Talaromycin A (1) and Talaromycin B (2) were isolated from a liquid culture of Talaromyces aurantiacus. The structures of 1 and 2 were elucidated by IR, MS, 1D and 2D NMR spectra and comparison of the experimental and calculated electronic circular dichroism spectra. Additional known compounds (3-6) were also isolated. These compounds were tested for monoamine oxidase, acetylcholinesterase and PI3K inhibitory activity, but showed only weak activity.