Studies on Agalwood (Jinko). X. Structures of 2-(2-Phenylethyl)chromone Derivatives

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 C_{5, 8'} and C_{6, 5'}.