Studies on agalwood (Jinko). X. Structures of 2-(2-phenylethyl)chromone derivatives.

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Abstract

Three new kinds of phenylethylchromone derivatives, called AH17 AH20 and AH23, were isolated from acetone and pyridine extracts of agalwood (Jinko) from Kalimantan. The structures of AH17 and AH23 were characterized as 5α, 6β, 7β-trihydroxy-8α-methoxy-2-(2-phenylethyl-5, 6, 7, 8-tetrahydrochromone and 5α, 6β, 7β, 8α-tetrahydroxy-2-[2-(2-hydroxyphenyl)ethyl]5, 6, 7, 8-tetrahydrochromone, respectively. AH20 was found to be a trimer formed by the ether-linkage made of 2-(2-phenylethyl)chromone and 2mol of agarotetrol at C5, 8' and C6, 5'.

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