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Keywords = wetland soil-derived fungus

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9 pages, 1171 KiB  
Article
Sporulosol, a New Ketal from the Fungus Paraconiothyrium sporulosum
by Chen Zhao, Peinan Fu, Yang Zhang, Xingzhong Liu, Fengxia Ren and Yongsheng Che
Molecules 2018, 23(6), 1263; https://doi.org/10.3390/molecules23061263 - 25 May 2018
Cited by 15 | Viewed by 3894
Abstract
Sporulosol (1), a new ketal, together with four known compounds, has been isolated from the liquid fermentation cultures of a wetland-soil-derived fungus, Paraconiothyrium sporulosum. Its structure was elucidated primarily by NMR experiments, and was further confirmed by X-ray crystallography. Sporulosol [...] Read more.
Sporulosol (1), a new ketal, together with four known compounds, has been isolated from the liquid fermentation cultures of a wetland-soil-derived fungus, Paraconiothyrium sporulosum. Its structure was elucidated primarily by NMR experiments, and was further confirmed by X-ray crystallography. Sporulosol was obtained as a racemic mixture and the resolved two enantiomers racemized immediately after chiral separation. Sporulosol appears to be the first ketal derived from a 6H-benzo[c]chromen-6-one and a benzofuranone unit. The compound showed modest cytotoxicity toward the human tumor cell line T24, with an IC50 value of 18.2 µM. Full article
(This article belongs to the Section Natural Products Chemistry)
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12 pages, 2054 KiB  
Article
Three Pairs of New Isopentenyl Dibenzo[b,e]oxepinone Enantiomers from Talaromyces flavus, a Wetland Soil-Derived Fungus
by Tian-Yu Sun, Run-Qiao Kuang, Guo-Dong Chen, Sheng-Ying Qin, Chuan-Xi Wang, Dan Hu, Bing Wu, Xing-Zhong Liu, Xin-Sheng Yao and Hao Gao
Molecules 2016, 21(9), 1184; https://doi.org/10.3390/molecules21091184 - 7 Sep 2016
Cited by 15 | Viewed by 4959
Abstract
Three pairs of new isopentenyl dibenzo[b,e]oxepinone enantiomers, (+)-(5S)-arugosin K (1a), (−)-(5R)-arugosin K (1b), (+)-(5S)-arugosin L (2a), (−)-(5R)-arugosin L (2b), (+)-(5S)-arugosin M [...] Read more.
Three pairs of new isopentenyl dibenzo[b,e]oxepinone enantiomers, (+)-(5S)-arugosin K (1a), (−)-(5R)-arugosin K (1b), (+)-(5S)-arugosin L (2a), (−)-(5R)-arugosin L (2b), (+)-(5S)-arugosin M (3a), (−)-(5R)-arugosin M (3b), and a new isopentenyl dibenzo[b,e]oxepinone, arugosin N (4), were isolated from a wetland soil-derived fungus Talaromyces flavus, along with two known biosynthetically-related compounds 5 and 6. Among them, arugosin N (4) and 1,6,10-trihydroxy-8-methyl-2-(3-methyl-2-butenyl)-dibenz[b,e]oxepin-11(6H)-one (CAS: 160585-91-1, 5) were obtained as the tautomeric mixtures. The structures of isolated compounds were determined by detailed spectroscopic analysis. In addition, the absolute configurations of these three pairs of new enantiomers were determined by quantum chemical ECD calculations. Full article
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8 pages, 721 KiB  
Article
Two New Coumarins from Talaromyces flavus
by Jun-Wei He, Da-Peng Qin, Hao Gao, Run-Qiao Kuang, Yang Yu, Xing-Zhong Liu and Xin-Sheng Yao
Molecules 2014, 19(12), 20880-20887; https://doi.org/10.3390/molecules191220880 - 12 Dec 2014
Cited by 19 | Viewed by 6192
Abstract
Two new coumarins, talacoumarins A (1) and B (2), were isolated from the ethyl acetate extract of the wetland soil-derived fungus Talaromyces flavus BYD07-13. Their structures were elucidated by spectroscopic data (NMR, MS) analyses. The absolute configuration of C-12 [...] Read more.
Two new coumarins, talacoumarins A (1) and B (2), were isolated from the ethyl acetate extract of the wetland soil-derived fungus Talaromyces flavus BYD07-13. Their structures were elucidated by spectroscopic data (NMR, MS) analyses. The absolute configuration of C-12 in 1 was assigned using the modified Mosher’s method, whereas that of C-12 in 2 was deduced via the circular dichroism data of its corresponding [Rh2(OCOCF3)4] complex. Compounds 1 and 2 were evaluated for their anti-Aβ42 aggregation, cytotoxic, and antimicrobial activities. The results showed that the two compounds had moderate anti-Aβ42 aggregation activity, and this is the first report on the Aβ42 inhibitory aggregation activity of coumarins. Full article
(This article belongs to the Section Natural Products Chemistry)
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