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Mar. Drugs 2017, 15(7), 204; doi:10.3390/md15070204

Isobenzofuranones and Isochromenones from the Deep-Sea Derived Fungus Leptosphaeria sp. SCSIO 41005

1
Chinese Academy of Sciences (CAS) Key Laboratory of Tropical Marine Bio-resources and Ecology/Guangdong Key Laboratory of Marine Materia Medica, South China Sea Institute of Oceanology, CAS, Guangzhou 510301, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
*
Authors to whom correspondence should be addressed.
Received: 11 May 2017 / Revised: 26 June 2017 / Accepted: 27 June 2017 / Published: 29 June 2017
(This article belongs to the Special Issue Marine Secondary Metabolite II, 2017)
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Abstract

Four new isobenzofuranones, leptosphaerins J–M (14), including an unusual naturally-occurring centrosymmetric dimer skeleton (1), and two new isochromenones, clearanols I–J (910), were obtained from a culture of a deep-sea sediment-derived fungus Leptosphaeria sp. SCSIO 41005, together with four known isobenzofuranones (58) and six known isochromenones (1116). These structures were elucidated by extensive spectroscopic analyses, and absolute configurations were assigned on the basis of electronic circular dichroism and optical rotations data comparison. Additionally, the absolute configurations of the new compounds 1 and 9, together with the known one 7 with stereochemistry undetermined, were further confirmed by single crystal X-ray diffraction experiments. A plausible biosynthetic pathway of these isobenzofuranones and isochromenones was also proposed. View Full-Text
Keywords: leptosphaerins; clearanols; deep-sea fungi; Leptosphaeria sp. leptosphaerins; clearanols; deep-sea fungi; Leptosphaeria sp.
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MDPI and ACS Style

Luo, X.; Lin, X.; Salendra, L.; Pang, X.; Dai, Y.; Yang, B.; Liu, J.; Wang, J.; Zhou, X.; Liu, Y. Isobenzofuranones and Isochromenones from the Deep-Sea Derived Fungus Leptosphaeria sp. SCSIO 41005. Mar. Drugs 2017, 15, 204.

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