Allylthiopyridazine derivatives and process for preparing the same
申请人:Kwon; Soon Kyoung
公开号:US05942511A1
公开(公告)日:1999-08-24
The, present invention relates to a novel allylthiopyridazine derivative represented by formula (I) which exhibits a superior effect for prevention and treatment or hepatic diseases induced by toxic substances and for protection of human tissues from radiation: ##STR1## or a pharmaceutically acceptable salt thereof, in which R.sub.1 represents halogen atom, lower alkoxy, dialkylaminoalkoxy, hydroxyalkoxy, phenoxy substituted or unsubstituted with lower alkyl, benzyloxy, or phenyl, and R.sub.2 and R.sub.3 independently of one another represent hydrogen or lower alkyl, or R.sub.2 and R.sub.3 together with carbon atom to which they are attached can form a saturated or unsaturated 6-membered ring, provided that R.sub.2 and R.sub.3 are other than hydrogen when R.sub.1 is chloro; and to a process for preparing thereof and a pharmaceutical composition containing the same as an effective component.
Hepatitis C virus inhibitors having the general formula (I) are disclosed. Compositions comprising the compounds and methods for using the compounds to inhibit HCV are also disclosed.
NOVEL ALLYLTHIOPYRIDAZINE DERIVATIVES AND PROCESS FOR PREPARING THE SAME
申请人:Seoul Pharm. Co., Ltd.
公开号:EP1058681B1
公开(公告)日:2003-05-07
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作者:V. V. Yanilkin、B. I. Buzykin、V. I. Morozov、N. V. Nastapova、N. I. Maksimyuk、R. M. Eliseenkova
DOI:10.1023/a:1013979709884
日期:——
Electrochemical reduction in dimethylformamide of unsymmetrical 1-Cl-4-X-phthalazines and symmetrical 1,4-X-2-phthalazines (X = Cl, PhO, MeO, EtO, i-PrO) was studied by voltammetry and electrolysis-ESR. The electron trasfer on 1,4-dichlorophthalazine and unsymmetrical 1-Cl-4-X-phthalazines induces anionoid elimination of Cl and X, pyridazine ring cleavage, and phthalonitrile formation. In this previously unknown process the transfer of two electrons induces cleavage of three sigma bonds and formation of two new pi bonds. The reduction of 1,4-dialkoxy(diaryloxy)phthalazines involves formation of stable radical anions which undergo no heteroring cleavage. Possible mechanisms of the processes studied were discussed. It was assumed that the same mechanism with pyridazine ring cleavage may be realized with other phthalazine derivatives and heteroannelated pyridazines containing readily leaving nucleofuge groups alpha to nitrogens.