Synthesis of Pyrazinothienopyrimidine Derivatives by the Application of the Intramolecular and Intermolecular Aza-Wittig Reaction/Heterocyclization
作者:José Quintela、Carlos Peinador、Gerardo Blanco
DOI:10.1055/s-2008-1072514
日期:2008.5
the intermolecular aza-Wittigreaction of N-heteroaryl phosphazene derivatives with carboxylic acid chlorides. The heterocyclization occurs via imidoyl chloride intermediates derived from phosphazenes 4A, B, obtained in a one-step process from α-azidothieno[2,3- B]pyrazine carboxylic acid 3. Moreover, cyclic pyrazinothienopyrimidines were prepared, in a two-step procedure, from amides and azidothienopyrazine-α-carbonyl