A chemoselective demethylation method for various methoxypyridine derivatives has been developed. Treatment of 4-methoxypyridine with L -selectride in THF for 2 h at reflux temperature afforded 4-hydroxypyridine in good yield; no reaction to anisole occurred. The utility of our method was demonstrated by the efficient synthesis of the metabolic substances of the antiulcer agent omeprazole. Chemoselective
Compositions and methods for lightening and/or depigmenting skin are provided, the compositions comprising compounds having the structure:
or having the structure:
as defined herein.
US9314415B2
申请人:——
公开号:US9314415B2
公开(公告)日:2016-04-19
[EN] INHIBITORS OF HK-ATPase<br/>[FR] INHIBITEURS DE HK-ATPASE
申请人:——
公开号:WO1999063940A2
公开(公告)日:1999-12-16
[EN] Disclosed are multibinding compounds which inhibit H<+>/K<+>-ATPase, an enzyme which is involved in the control of acid secretion in the stomach. The multibinding compounds of this invention containing from 2 to 10 ligands covalently attached to one or more linkers. Each ligand is an inhibitor of H<+>/K<+>-ATPase. The multibinding compounds of this invention are useful in the treatment gastroesophageal reflux disease ("GERD"). [FR] L'invention concerne des composés multiliaisons qui inhibent la H<+>/K<+>-ATPase, une enzyme qui intervient dans la régulation de la sécrétion d'acide dans l'estomac. Les composés multiliaisons de l'invention contiennent de 2 à 10 ligands fixés de manière covalente à un ou à plusieurs lieurs. Chaque ligand constitue un inhibiteur de H<+>/K<+>-ATPase. Les composés multiliaisons de l'invention sont utiles dans le traitement de reflux gastro-oesophagien pathologique (RGO).