The isolation an
structural elucidation of β-D- glucopyranose 1,2,6- tris (pyrrole-2-carboxylate) ( buprestin A) (1) and β-D- glucopyranose 6- (4-hydroxybenzoate) 1,2-bis(pyrrole-2-carboxylate) ( buprestin B) (3), bitter principles of beetles of the family Buprestidae , are reported.
The depsidones lecideoidin
(3',5-dichloro-2',4-dihydroxy-1'-methoxycarbonyl-6,6'-dimethyldepsidone) (3)
and 3'-dechlorolecideoidin (5-chloro-2',4-dihydroxy-1'-methoxycarbonyl-6,6'-dimethyldepsidone)(4) have been isolated from
an Australian Lecidea species. The
structure of these compounds followed from the spectroscopic properties and by
conversion of the former compound into the syntheticdepsidone, 3'-chloro-O-methylgangaleoidin (13).
The triterpenes 20α-acetoxyhopane-6α, 22-diol, 16β-acetoxyhopane-6α,22-diol,
6α-acetoxyhopane-16β,22-diol
and 6α,l6β -diacetoxyhopan-22-ol have
been isolated from chemical strains of Physcia aipolia. The structure of these triterpenes
followed primarily from the 13C n.m.r. spectra.
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