Three new compounds including a meroterpenoid (1) and two isocoumarins (8 and 9), together with thirteen known compounds (2–7, 10–16) were isolated from the metabolites of Talaromyces amestolkiae MST1-15. Their structures were identified by a combination of spectroscopic analysis. The absolute configuration of compound 1 was elucidated on the basis of experimental and electronic circular dichroism calculation, and compounds 8 and 9 were determined by Mo2(OAc)4-induced circular dichroism experiments. Compounds 7–16 showed weak antibacterial activities against Stenotrophomonas maltophilia with MIC values ranging from 128 to 512 μg/mL (MICs of ceftriaxone sodium and levofloxacin were 128 and 0.25 μg/mL, respectively).

New highly conjugated bispyryliums were synthesized by the Knoevenagel reaction between α‐CH3 pyrylium and aromatic dicarboxaldehydes. Their photophysical properties were fully investigated. The results showed that they exhibited a tunable fluorescence emission colors ranging from green to red in solution by changing the properties of connecting π bridges. The experimental results were also supported by theoretical calculations. In addition, their fluorescence emission in solid state was also investigated preliminarily. © 2012 Wiley Periodicals, Inc. Heteroatom Chem 24:66–71, 2013; View this article online at http://wileyonlinelibrary.com. DOI 10.1002/hc.21064

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