Functionalization of dihydrodipyridopyrazines involving palladium-catalyzed coupling reactions
摘要:
Various 4-substituted dihydrodipyridopyrazines were synthesized by palladium-mediated cross-coupling reactions. Starting from the corresponding 4-iodo or 4-bromo derivatives, the incorporation of aryl, vinyl, alkynyl and methoxycarbonyl groups is described. (C) 2004 Elsevier Ltd. All rights reserved.
The synthesis of new 4,6-disubstituted dihydrodipyridopyrazines starting from corresponding carboxaldehydes vialithiationdirected by alpha-amino alkoxides is described. The N,N,N'-trimethylethylenediamine was used as amine component for in situ formation of the alpha-amino alkoxides. After optimization, this reaction allowed easy access to new interesting starting materials for further applications
Unprecedented dihydrodipyridopyrazines were easily obtained by hetarynic dimerization of 2-alkylamino-3-halogenopyridines in the presence of the complex base NaNH2-tBuONa. Derivatizations of the new heterocycles are described. The anticancer activity of these compounds is also mentioned. (C) 2002 Elsevier Science Ltd. All rights reserved.
Design of new anticancer drugs. I. Easy hetarynic access to dihydrodipyridopyrazines, a new family of antitumor agents
Unprecedented dihydrodipyridopyrazines were easily obtained by hetarynic dimerization of 2-alkylamino-3-bromopyridines in the presence of the complex base NaNH2-tBuONa. A few chemical properties of these new heterocycles are reported, as well as their antitumoral activity. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
US6127369A
申请人:——
公开号:US6127369A
公开(公告)日:2000-10-03
Efficient Synthesis of 3-Bromo-2-[(N-substituted)amino]pyridines and their Hetarynic Cyclization
A variety of3-bromo-2-[(N-substituted)amino]pyridines were obtained via two convenient methods and were used in the hetarynic synthesis of the corresponding N-substituted dihydro-dipyridopyrazines.