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Oxyfadichalcones A-C: three chalcone dimers fused through a cyclobutane ring from Tibetan medicine Oxytropis falcata Bunge
Tetrahedron
Short Title: TetrahedronOxyfadichalcones A-C
Format: Journal Article
Publication Date: 2013/12/30/
Pages: 11074 - 11079
Sources ID: 95731
Visibility: Public (group default)
Abstract: (Show)
Oxyfadichalcones A and B, two unprecedented chalcone dimers fused through a cyclobutane ring by head-to-tail [2+2] cycloaddition of two chalcones that had never been found previously in nature, along with oxyfadichalcone C, a new head-to-head [2+2] cyclized chalcone dimer, were simultaneously obtained from Oxytropis falcata. Structural elucidation was succeeded by spectroscopic and single-crystal synchrotron radiation analysis. Additionally, the photosynthesis of the chalcone dimers was performed and the plausible biosynthesis was discussed. (C) 2013 Elsevier Ltd. All rights reserved.