drug targets. We report here the synthesis of a panel of naphthazarin derivatives and discovery of 2-methyl-5,8-dihydroxy-1,4-naphthoquinone (3, 2-methylnaphthazarin) as a potent cytotoxic agent with a submicromolar half maximal inhibitory concentration to the human promyelocytic leukemia HL-60 cells. Mechanism studies reveal that the compound selectively inhibits TrxR to induce oxidative stress-mediated
5,8-dihydroxy naphthalene-1,4-dione derivative and a hair dye
申请人:Shiseido Company Ltd.
公开号:US04605419A1
公开(公告)日:1986-08-12
A naphthalene derivative having the general formula: ##STR1## wherein R represents hydrogen, an alkyl group having 1 to 8 carbon atoms, an R.sup.1 O (CH.sub.2).sub.n group, or a benzyl group, R.sup.1 represents hydrogen or a lower alkyl group, and n represents an integer of 2 or 3. This compound in the leuco state can be stably isolated and can produce a strong and fast color upon oxidation under moderate conditions. This compound can be advantageously included in a hair dye composition, which is capable of stably and safely dyeing hair with a good and stable color under moderate conditions.