Efficient Preparation of Proline N-Carboxyanhydride Using Polymer-Supported Bases
摘要:
[GRAPHICS]A procedure for the preparation of proline N-carboxyanhydride in high yield and purity is described using polymer-supported tertiary amines. The polymer-supported amine can be recycled with a basic wash and filtration of the resin. The procedure facilitates the access to the efficient preparation of the polyproline polymer with potential therapeutic interest.
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.