Dipent-4-enyl acetals, which are congeniently prepared by treating ketones or aldehydes with pen-4-enyl alcohol under standard conditions, readily acetalize diols in acetonitrtile solvent, and although neutral promoters such as N-halogenosuccinimides and iodonium dicollidine peerchlorate are effective, the rates and yields are greatly enhanced by the addition of catalytic amounts of an acid.
[EN] NOVEL DERIVATIVES OF CYCLIC COMPOUND AND THE USE THEREOF<br/>[FR] NOUVEAUX DÉRIVÉS DE COMPOSÉS CYCLIQUES ET LEUR UTILISATION
申请人:WONKISOPHARM CO LTD
公开号:WO2008004788A1
公开(公告)日:2008-01-10
[EN] The present invention relates tonovel cyclic derivatives having potent inhibiting effect on melanin formation and skin hyper-pigmentation activity with no adverse response to skin, therefore, they can be used as the therapeutics for treating and preventing the skin disease caused by over-reproduced melanin. [FR] L'invention porte sur de nouveaux dérivés de composés cycliques ayant un effet inhibiteur puissant sur la formation de la mélanine et l'hyper-pigmentation de la peau, non dommageables à la peau, et qui peuvent servir à traiter et prévenir les maladies de la peau liées à une surproduction de mélanine.