Abstract
Talaromycones A (1) and B (2), new xanthenediones, were isolated from the cultures of Talaromyces sp. ECN211, an endophytic fungus, along with α-diversonolic ester (3), aspergillusone B (4), glauconic acid (5), and rosellisin (6). The planar structures of 1 and 2 were elucidated by extensive spectroscopic analyses. Furthermore, the absolute configurations of 1–4 were determined by single-crystal X-ray diffraction and electronic circular dichroism spectroscopy (ECD). In addition, the crystallographic data for 5 were updated for the first time in over 50 years.
Highlights
The xanthones, which are a class of phenolic compounds produced by many different organisms, including plants, lichens, fungi, and bacteria, occur as completely aromatized, dihydro, tetrahydro, and hexahydro derivatives [1]
As part of our research into compounds produced by endophytic fungi in Japan [7,8,9], we isolated two new diversonolic ester-related xanthenediones from Talaromyces sp
ECN211 was isolated from healthy leaves of Selaginella tamariscana and identified by sequencing the D1/ D2 26S rRNA gene and the internal transcript spacer (ITS) of its ribosomal DNA [10]
Summary
The xanthones, which are a class of phenolic compounds produced by many different organisms, including plants, lichens, fungi, and bacteria, occur as completely aromatized (xanthones in the narrow sense), dihydro, tetrahydro, and hexahydro derivatives [1]. As part of our research into compounds produced by endophytic fungi in Japan [7,8,9], we isolated two new diversonolic ester-related xanthenediones from Talaromyces sp.
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