An efficient and environmentally benign one-pot condensation of cyclic diketones, aldehydes naphthols was achieved with 1,4-diazabicyclo[2-2-2]octane supported on Amberlyst-15 as a novel catalyst, producing variety benzoxanthenones in good to excellent yields. The advantages this multicomponent reaction include the use heterogeneous solventless conditions simple methodology that is atom-economi...

The mono ortho-bromination of phenolic building blocks by NBS has been achieved in short reaction times (15-20 min) using ACS-grade methanol as a solvent. The reactions can be conducted on phenol, naphthol and biphenol substrates, giving yields of >86% on gram scale. Excellent selectivity for the desired mono ortho-brominated products is achieved in the presence of 10 mol % para-TsOH, and the r...

Eighteen polyketides (1-18) including six citrinin derivatives, two phenol derivatives, one cyclopentenone, two naphthol derivatives, and seven tetralone derivatives were isolated from the culture broth of a marine-derived fungal strain Xylariaceae sp. SCSGAF0086. Five of these compounds (1, 2, 8, 9, and 10) were new, and their structures were determined by spectroscopic methods. Compounds 4, 6...

In the title compound, C(29)H(24)N(4)O(2)S, intra-molecular O-H⋯N hydrogen bonding influences the mol-ecular conform-ation; the naphthol system and triazole ring form a dihedral angle of 3.88 (7)°. In the crystal, π-π inter-actions between the five- and six-membered rings of neighbouring mol-ecules [centroid-centroid distances = 3.541 (3) and 3.711 (3) Å] consolidate the crystal packing.

Antioxidants inhibit the fatty acid oxygenase of sheep vesicular gland and soybean lipoxygenase in an ins~~n~us, reversible manner. Their in~bito~ effectiveness was not related to their traditional antioxidant potencies but seemed to depend on the nature of the enzyme. The destructive effect of eicosa-58, I I, +tetraynoic acid, a substrate analog, on vesicular gland oxygenase could be prevented...