3,5-di-iso-propyl-heptatrienoic acid derivatives having serum glucose reducing activity
申请人:Allergan, Inc.
公开号:US06759546B1
公开(公告)日:2004-07-06
Compounds of the formula
where the variables have the meaning defined in the specification are capable of reducing serum glucose levels in diabetic mammals without the undesirable side effect of reducing serum thyroxine levels.
Lewis acid-catalyzed claisen rearrangement in the preparation of chiral products
申请人:The Regents of the University of California
公开号:US06359174B1
公开(公告)日:2002-03-19
A novel Claisen rearrangement reaction is provided. An allylic reactant such as an allylic amine, an allylic ether or an allylic thioether is reacted with an acid chloride in the presence of a Lewis acid catalyst composition composed of a Lewis acid and a base selected from the group consisting of tertiary amines and non-nitrogenous bases. The stereochemistry of the reaction product is readily controlled by the positioning and size of substituents on the allylic reactant. The reaction may be carried out on a solid support, i.e., on the surface of a substrate suitable for conducting solid phase chemical reactions.