Abstract:
PURPOSE: A novel kojic acid derivative with a skin whitening effect is provided to suppress pigmentation. CONSTITUTION: A novel kojic acid derivative with a skin whitening effect contains a kojic acid derivative of chemical formula 1 or an isomer, a pharmaceutically acceptable salt, a prodrug, a hydrate, or a solvate thereof. In chemical formula 1, R1 is -CH2- or -CH2CH2-; R2 is -CH2OC(O)- or -CH2OC(O)CH=CH-; and n is 1, 2, or 3.
Abstract:
PURPOSE: A kojic acid derivative and a cosmetic composition containing the same for skin whitening are provided to suppress melanogenesis and pigmentation with skin safety and to be applied to an external use skin formulation. CONSTITUTION: A kojic acid derivative is denoted by chemical formula 1. A method for preparing the derivative of chemical formula 1 and a pharmaceutically acceptable salt thereof comprises a step of reacting halo kojic acid of chemical formula 2 and inorganic salts of benzoic acid containing an adamantane group of chemical formula 3 to prepare a kojic ester compound. A method for preparing a derivative and pharmaceutically acceptable salt comprises: a step of reacting the kojic acid with halo-thionyl and preparing halo kojic acid; a step of reacting adamantane with benzoic acid containing a substituent of hydrogen, hydroxyl, or alkoxy of 1-3 carbon atoms and preparing benzoic acid containing the adamantane group; a step of reacting an inorganic compound with the benzoic acid and preparing inorganic salts; and a step of reacting prepared kojic acid chloride and inorganic salt of benzoic acid and preparing a kojic acid ester compound. A composition for whitening contains 0.01-20 wt% of the derivative and pharmaceutically acceptable salts thereof as active ingredients.
Abstract:
PURPOSE: A composition for preventing or treating acne is provided to ensure high stability and excellent usability. CONSTITUTION: A composition for preventing or treating acne contains 0.001-50 weight% of benzoyl peroxide, derivative thereof, hydrous form, or pharmaceutically salt thereof; 0.001-50 weight% of clindamycin, derivative thereof, hydrous form, or pharmaceutically acceptable salt thereof; and 0.01-10 weight% of sodium pyrosulfite.
Abstract:
Provided are a 2-cyclopenten-1-one oxime derivative which inhibits the production of TNF-alpha or PEF4, its pharmaceutically acceptable salt, and a pharmaceutical composition containing the derivative for treating or preventing the TNF-alpha mediated disease. A 2-cyclopenten-1-one oxime derivative is represented by the formula(1), wherein R1 is a linear or branched C1-C10 alkyl group or a C3-C7 cycloalkyl group; and R2 is a substituted or unsubstituted aromatic group. Preferably the aromatic group of R2 is selected from a phenyl group, a pyridyl group, a naphthyl group, an indolyl group, a thienyl group, a benzo[b]thienyl group, a dibenzofuranyl group, or a thianthrenyl group.