作者:Andrea Pinto、Paola Conti、Lucia Tamborini、Carlo De Micheli
DOI:10.1016/j.tetasy.2009.02.010
日期:2009.3
This report describes an efficient synthesis of the natural isomer of acivicin, which is the only one provided with a noteworthy biological activity. The present procedure allowed the synthesis of (+)-1 in just five steps with a 34% overall yield. Due to the easy separation of the two diastereomers and to the availability of the starting material at low cost, the present procedure can be scaled-up to gram quantities. (c) 2009 Elsevier Ltd. All rights reserved.
Synthesis and pharmacological characterization at glutamate receptors of erythro- and threo-tricholomic acid and homologues thereof
作者:Paola Conti、Marco De Amici、Gabriella Roda、Andrea Pinto、Lucia Tamborini、Ulf Madsen、Birgitte Nielsen、Hans Bräuner-Osborne、Carlo De Micheli
DOI:10.1016/j.tet.2006.12.066
日期:2007.3
The erythro- and threo-amino-(3′-hydroxy-4′,5′-dihydro-isoxazol-5′-yl)-acetic acids, stereoisomers of tricholomic acid, were synthesized along with the corresponding higher homologues erythro- and threo-amino-(3′-carboxy-4′,5′-dihydro-isoxazol-5′-yl)-acetic acids. The target compounds were prepared via the 1,3-dipolar cycloaddition of a suitable nitrile oxide to (±)-2-tert-butoxycarbonylamino-3-buten-1-ol
fashion, and stereochemistry plays a pivotal role in biological activity. Herein, we investigated the significance of chirality for nature-inspired 3-Br-acivicin (3-BA) and its derivatives. The three unnatural isomers of 3-BA and its ester and amide derivatives were prepared and characterized for their antimalarial activity. Only the (5S, αS) isomers displayed significant antiplasmodial activity, revealing