Furanmonogones A and B: two rearranged acylphloroglucinols with a 4,5-seco-3(2H)-furanone core from the flowers of Hypericum monogynum
Literature Information
Wen-Jun Xu, Jun Luo, Rui-Jun Li, Ming-Hua Yang, Ling-Yi Kong
Furanmonogones A (1) and B (2), two rearranged acylphloroglucinols with an unprecedented 4,5-seco-3(2H)-furanone skeleton, were isolated from the flowers of Hypericum monogynum. Their structures were established based on 1D- and 2D-NMR data, quantum chemical predictions (QCP) of 13C NMR chemical shifts, and electronic circular dichroism (ECD) calculations. Baeyer–Villiger oxidation at the single bond (C4–C5) of the acylphloroglucinol core was proposed as a key step in the plausible biogenetic pathway of 1 and 2.
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