Novel approach to the synthesis of perhydropyrazino[1,2-a]pyrazine derivatives from amino alcohols
摘要:
2,4,7-Trisubstituted hydrogenated pyrazino[1,2-a]pyrazines as potential P-turn mimetics were prepared for the first time in a stereoselective synthesis from hexahydro[1,2,3]triazolo[1,5-a]pyrazines. (c) 2005 Elsevier Ltd. All rights reserved.
Intramolecular [2+3]-addition of an azide to a CC double bond as a novel approach to piperazines
摘要:
An intramolecular [2+3]-cycloaddition of an azide to a C=C double bond was carried out to obtain hexahydro[1,2,3]triazolo[1,5-a]pyrazines. These compounds were used as intermediates to prepare 2-(halogenomethyl)piperazines that could serve as precursors for various condensed derivatives. (C) 2004 Elsevier Ltd. All rights reserved.