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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Grisemycin, a Bridged Angucyclinone with a Methylsulfinyl Moiety from a Marine-Derived Streptomyces sp
Zeping Xie1, Ling Zhou1, Lin Guo1
1The Key Laboratory of Traditional Chinese Medicine Prescription Effect and Clinical Evaluation of State Administration of Traditional Chinese Medicine, School of Pharmacy, ‡School of Enology, and §School of Gerontology, Binzhou Medical University , Yantai 264003, China.
Abstract:
Grisemycin (1), the first sulfur angucyclinone with an unusual ether-bridged system, was isolated from a marine-derived Streptomyces griseus strain M268. Its novel, here cage-like, structure was determined by spectroscopic analysis and single-crystal X-ray diffraction. Compound 1 exhibited modestly selective activity against the HL-60 cell line with an IC50 value of 31.54 μM. Futhermore, the absolute stereochemistry of kiamycin (2), an 1,12-epoxybenz[a]anthracene, previously obtained from the same strain, was established by X-ray diffraction analysis.
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