Activation of phenolic oxygen atom using polyphosphoric acid: Synthesis of carbonyl-containing dihydrobenzofurans/dihydrobenzopyrans
Carbonyl-containing dihydrobenzofurans/dihydrobenzopyrans were prepared from carbonyl-containing ortho-allyl/prenylphenols by activation of phenolic oxygen atom using polyphosphoric acid (PPA). Various substrates were investigated, and the corresponding d
Acid-catalysed Cyclisations of Xanthones: Structure of a New Xanthone from Garcinia mangostana Linn.
Acid-catalysed cyclisations of hydroxyprenylxanthone metabolites, mangostin (I) and normangostin (VI) from Garcinia mangostana Linn. have been studied.A new xanthone garcinone-E has also been isolated from G.mangostana and the structure (IX) is established on the basis of its cyclised dihydropyranoxanthone derivative (X).
Dutta, P. K.,Sen, A. K.,Sarkar, K. K.,Banerji, N.
p. 281 - 282
(2007/10/02)
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