Friedel-Crafts α-Aminoacylation of Aromatic Compounds with a Chiral N-Carboxy-α-amino Acid Anhydride (NCA); Part 2
作者:Osamu Itoh、Akira Amano
DOI:10.1055/s-1999-3405
日期:1999.3
The N-carboxy-α-amino acid anhydrides (NCA) derived from L-Asp(OEt), L-Glu(OMe), L-Met, and L-Pro reacted with aromatic compounds (toluene or benzene) in the presence of AlCl3, to afford the corresponding α-aminoalkyl aryl ketones as hydrochloride salts in moderate yields. The β- and γ-amino acid esters, which were obtained from the reaction of the aromatic compounds with L-Asp(OEt)- and L-Glu(OMe)-NCA, were hydrolyzed by hydrochloric acid to the corresponding β- and γ-amino acids as hydrochloride salts. L-Phe-NCA did not react with benzene in the presence of AlCl3, instead an intramolecular acylation occurred to afford (S)-2-aminoindanone hydrochloride. The chiralities of the original L-α-amino acids were most retained during these α-aminoacylation.
Manufacturing process for sitagliptin from L-aspartic acid
申请人:Soukup Milan
公开号:US20120123144A1
公开(公告)日:2012-05-17
The present invention relates to a novel manufacturing process of pharmaceutically active compound of formula I used as oral anti-diabetic drug. Starting from L-aspartic acid derivate of formula IV the invention describes preparation of the chiral (R)-β-amino acid of formula II known as a precursor in the synthesis of Sitagliptin (formula I).
[EN] MANUFACTURING PROCESS FOR SITAGLIPTIN FROM L-ASPARTIC ACID<br/>[FR] PROCÉDÉ DE FABRICATION DE SITAGLIPTINE À PARTIR D'ACIDE L-ASPARTIQUE
申请人:DRUG PROCESS LICENSING ASS LLC
公开号:WO2012156888A1
公开(公告)日:2012-11-22
The present invention relates to a novel manufacturing process of pharmaceutically active compound of formula (I) used as oral anti-diabetic drug. Starting from -aspartic acid derivate of formula (IV) the invention describes preparation of the chiral (R)-β-amino acid of formula (II) known as a precursor in the synthesis of Sitagliptin (Formula I). Formulae (I), (II) & (IV):