Stereoselective <i>trans-</i> and <i>cis-</i>Dihydroxylations of 2<i>H</i>-Pyranyl and Dihydropyridinyl Heterocycles Synthesized from Formal [3 + 3]-Cycloaddition Reactions of α,β-Unsaturated Iminium Ions with 1,3-Dicarbonyl Equivalents<sup>†</sup>
作者:Luke R. Zehnder、Lin-Li Wei、Richard P. Hsung、Kevin P. Cole、Michael J. McLaughlin、Hong C. Shen、Heather M. Sklenicka、Jiashi Wang、Craig A. Zificsak
DOI:10.1021/ol010034r
日期:2001.7.1
[GRAPHICS]We describe here an inherent problem in direct epoxidation of the endocyclic olefin in 2H-pyrans fused to 2-pyrones, Such difficulties led to the development of highly stereoselective trans- and cis-dihydroxylations of these olefinic systems in both 2H-pyrans and dihydropyridines fused to a 2-pyrones or a 2-cyclohexenone. Protocols for the removal of the activated allylic hydroxyl group are also reported.
Methods of treating cataracts and diabetic retinopathy with tricyclic pyrones
申请人:Hua Duy H.
公开号:US06916824B1
公开(公告)日:2005-07-12
Water-soluble, cell permeable aldose reductase inhibitors are presented. These compounds prevent the effects of galactosemia in patients. The compounds prevent both the accumulation of polyols and the change in levels of protein kinase C gamma observed during diabetes and galactosemia.