A concise synthesis of (S)-3-hydroxytetrahydropyran from natural l-glutamic acid has been developed. The intramolecular etherification starting from 1,5-diol was promoted by trifluoromethanesulfonic anhydride. The clinnamates of the alcohols were prepared for accurately determining the optical purity by HPLC method.
activity of innateimmuneresponses. However, biological studies on this compound have been limited by the low amounts of 1 available from natural resources and the difficulty of its synthesis. In this study, we designed and synthesized structure-simplified gonytolide derivatives. Bischromone 10 and biflavone 13 both promoted the mammalian TNF-α signaling pathway and Drosophila innateimmunity. They did
The present invention relates to inhibitors of 11-β hydroxyl steroid dehydrogenase type 1 and pharmaceutical compositions thereof. The compounds of the invention can be useful in the treatment of various diseases associated with expression or activity of 11-β hydroxyl steroid dehydrogenase type 1.
A study into the synthesis and synthetic utility of (S)-3-benzyloxy-3,4,5,6-tetrahydropyridine N-oxide is described. This nitrone is readily accessed from L-glutamic acid and the regio- and stereoselectivity of cycloaddition of this compound with a range of alkenes has been probed. Reductive cleavage of the major cycloadducts provides access to a diverse range of trans-2,3-disubstituted piperidines. The synthetic scope of this nitrone is further illustrated by the use of this compound as a key intermediate in a concise synthesis of the anti-malarial agent (+)-febrifugine. (C) 2009 Elsevier Ltd. All rights reserved.