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Viminalins A-O: Diverse [3+2] hybrids of acylphloroglucinol and α-phellandrene from the fruits of Callistemon viminalis

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Viminalins A-O (1–15), a series of new [3+2] hybrids of acylphloroglucinols and α-phellandrene featured a 2,3-dihydrobenzofuran core were isolated from the fruits of Callistemon viminalis. Their structures were established on… Click to show full abstract

Viminalins A-O (1–15), a series of new [3+2] hybrids of acylphloroglucinols and α-phellandrene featured a 2,3-dihydrobenzofuran core were isolated from the fruits of Callistemon viminalis. Their structures were established on the basis of extensive analysis of NMR spectra, circular dichroism, and X-ray crystallography. An oxidative [3+2] cycloaddition between acylphloroglucinol and monoterpene was speculated as the key step in the biosynthetic pathway. Bioactivities screen indicated that compound 6 exhibited moderate cytotoxic activity.

Keywords: fruits callistemon; hybrids acylphloroglucinol; diverse hybrids; viminalins diverse; callistemon viminalis

Journal Title: Tetrahedron
Year Published: 2017

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