Synthesis of new triazole substituted pyroaminoadipic and pipecolic acid derivatives
作者:Fatimazohra Lenda、Farhate Guenoun、Bouchra Tazi、Najib Ben larbi、Jean Martinez、Frédéric Lamaty
DOI:10.1016/j.tetlet.2004.09.166
日期:2004.11
Racemic 5-(4,5-substituted-1H-1,2,3-triazol-lyl)-pyroaminoadipic and pipecolic acid derivatives were synthesized from meso dimethyl-alpha,alpha'-dibromoadipate 1 in good yields using mild reaction conditions. The key step of this reaction sequence was the 1,3-dipolar cycloaddition of an acetylenic compound on alpha-azido-alpha'-bromoadipate 2. A reactive alpha-(substituted-1H-1,2,3-triazol-1-yl)-alpha'- bromoadipate derivative 3a-d was generated and reacted with sodium azide followed by Pd/C-catalyzed hydrogenation to provide lactams 5a-d. The chemoselective reduction of the amide carbonyl group of 5a-d with BH3 followed by acid hydrolysis provided 5-(4,5-substituted-1H-1,2,3-triazol-1-yl) pipecolic acids in racemic form. (C) 2004 Elsevier Ltd. All rights reserved.