[EN] A NOVEL SYNTHESIS OF 2-AZABICYCLIC-3-CARBOXYLIC ACIDS, USEFUL AS IMPORTANT DRUG INTERMEDIATES [FR] NOUVELLE SYNTHESE DES ACIDES 2-AZABICYCLIQUES-3-CARBOXYLIQUES UTILISES COMME INTERMEDIAIRES MEDICAMENTAUX IMPORTANTS
Alternative and Chemoselective Deprotection of the ?-Amino and Carboxy Functions ofN-Fmoc-Amino Acid andN-Fmoc-Dipeptide Methyl Esters by Modulation of the Molar Ratio in the AlCl3/N,N-Dimethylaniline Reagent System
作者:Maria�Luisa Di Gioia、Antonella Leggio、Adolfo Le Pera、Angelo Liguori、Francesca Perri、Carlo Siciliano
Conversion of isomeric 2:3 adducts (aminoacid–formaldehyde) to N-acyl-pseudoprolines derivatives
作者:Jimmy Sélambarom、Jacqueline Smadja、André A. Pavia
DOI:10.1016/j.tetlet.2004.11.134
日期:2005.1
or acid anhydrides with isomeric2:3 adducts derived from condensation of l-serine (1a), l-threonine (1b) and l-cysteine (1c) methyl esters with formaldehyde afforded N-acyl-pseudoprolines 7–19 in various yields. These 2:3 adducts can be considered as synthetic equivalents of oxaproline and thiaproline moieties. The present work revealed the versatile behaviour of the two 2:3 adducts as a consequence
(S)-(-)-N-acetyl-2-methoxycarbonylaziridine 1 undergoes easy ring-opening by Bronsted acids or nucleophiles in the presence of a Lewis acid catalyst. The regioselectivity is not always exclusive, affording optically active alpha- and beta-aminoacids.
Process for the synthesis of (2S, 3aR, 7aS)octahydroindole-2-carboxylic acid and its conversion to trandolapril