A convenient access to the 1,5-anhydro forms of d-tagatose, l-rhamnulose and d-xylulose via 2-hydroxyglycal esters
摘要:
Zemplen methanolysis or a three-step protocol comprising hydroxylaminolysis, de-O-acetylation and deoximination smoothly and efficiently convert the benzoylated 2-hydroxy-D-glycals Of D-galactose, L-rhamnose and D-Xylose into their configurationally related 1,5-anhydro-ketoses, thereby providing convenient access to the 1,5-anhydro forms of D-tagatose, L-rhamnulose and D-Xylulose. Invariably obtained as amorphous solids, they are best characterized through their highly crystalline oximes. (C) 2009 Elsevier Ltd. All rights reserved.
5-HYDROXY-2-METHYL-4H-PYRAN-4-ONE ESTERS AS NOVEL TYROSINASE INHIBITORS
申请人:Wempe Michael Fitzpatrick
公开号:US20090215887A1
公开(公告)日:2009-08-27
Skin brightening compositions based on esters of 5-hydroxy-2-methyl-4H-pyran-4-one. Also disclosed are methods of making the compositions as well as methods of using the compositions.
5-Hydroxy-2-Methyl-4H-Pyran-4-One Esters as Novel Tyrosinase Inhibitors
申请人:Wempe Michael Fitzpatrick
公开号:US20100216873A1
公开(公告)日:2010-08-26
Skin brightening compositions based on esters of 5-hydroxy-2-methyl-4H-pyran-4-one. Also disclosed are methods of making the compositions as well as methods of using the compositions.
5-hydroxy-2-methyl-4H-pyran-4-one esters as novel tyrosinase inhibitors
申请人:Eastman Chemical Company
公开号:US08183398B2
公开(公告)日:2012-05-22
Skin brightening compositions based on esters of 5-hydroxy-2-methyl-4H-pyran-4-one. Also disclosed are methods of making the compositions as well as methods of using the compositions.