A method of synthesizing commercial quantities of the pentapeptide L-aspartyl-L-seryl-L-aspartyl-L-prolyl-L-arginine, and salts or solvates thereof, e.g., the hydrochloride or acetate salt or water solvate, compounds useful in pharmaceutical compositions for the treatment of allergic conditions, is disclosed, as are novel intermediate compounds produced in the course of the synthesis.
Trends in Asymmetric Michael Reactions Catalysed by Tripeptides in Combination with an Achiral Additive in Different Solvents
作者:Svetlana B. Tsogoeva、Sunil B. Jagtap、Zoya A. Ardemasova、Victor N. Kalikhevich
DOI:10.1002/ejoc.200400243
日期:2004.10
as chiral catalysts for asymmetric Michael addition reactions in the presence of an achiral additive has been tested in different solvents (CHCl3, acetone, DMF, DMSO and the room-temperature ionic liquid [bmim]PF6). The dependence of yields and enantiomeric excesses on the solvent used has been demonstrated. The experiments show that the combination of additive and peptides provides a catalytic system