Acylation of 2-naphthol (2), 1-naphthol(6) and resorcinol (11) with salicylic acid (1) in the presence of PPA affords salicylate esters (4,7,13 and 14), 1,2-benzoxanthone (5), 3,4-benzoxanthone(8), 3-hydroxyxanthone(12), ...

A biogenetic-type synthesis of 2-hydroxy-4,4,7-trimethyl-1(4H)-naphthalenone (1), a modified apocarotenoid isolated from Ipomoea pes-caprae (Linn.) R.Br. showing anti-inflammatory activity by inhibiting prostaglandin ...

Thermal condensation of 2'-hydroxyacetophenones 1a-e with phenylacetic acid 2a in refluxing diphenyl ether gives 4-methyl-3-phenylcoumarins 3a-e. Similarly, reaction of 2-hydroxybenzaldehydes 1f-m and 2-hydroxybenzophenones ...

Two different high yielding synthetic routes both starting with 6-methylcoumarin 2 have been described to prepare 4-hydroxy-7-methyl-1-indanone 1, a constituent of cyanobacterium Nostoc commune having antibacterial activity. ...

Tyrosinase, a melanosomal membrane protein containing copper, is a key enzyme for melanin synthesis in melanocytes. Inulavosin inhibits melanogenesis by enhancing a degradation of tyrosinase in lysosomes. However, the ...

A new series of chalcones, flavanones and flavones with methylenedioxy group at the 3',4' position in chalcone, 7,8 position in flavanones and flavones with mono-, di- and trimethoxy groups in the benzaldehyde ring have ...

Single crystal X-ray structure characterization of isomeric 2-(2,4,4-trimethyl-3,4-dihydro-2H-benzo[h]chromen-2-yl)-1-naphthyl acetate (1) and 3-(2,4,4-trimethyl-3,4-dihydro-2H-benzo[g]chromen-2-yl)-2-naphthyl acetate (2) ...

Long chain alkyl hydroxycinnamates (8-21) were synthesized from the corresponding half esters of malonic acid (5-7) and benzaldehyde derivatives by Knoevenagel condensation. The total antioxidant capacity of these ...

Synthesis of the title compound(1), a naturally occurring C-11 coumarin, isolated from Heritiera ornithocephala Kosterm has been achieved, A probable biogenesis of 1 involving the mode of elimination of four carbon atoms ...