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A novel intramolecular cyclo-elimination via transamidation on the Rink Amide AM resin under mild basic conditions is presented. The methodology led to the synthesis of an important class of cardiotonic agents: imdiazo- and pyrimido-quinazolines from the corresponding 2-aminoquinazoline hydrobromide salt under mild basic conditions. NMR based titration studies revealed the role of hydrobromide as...
A novel imidazoquinazolinone-based tricyclic structure with three-point diversity has been synthesized using solid-phase methodology. The compounds were obtained by treating the amino group of polymer-linked amino acids with 2-nitrobenzaldehyde followed by reduction of the nitro group to an amine. Derivatization of amine with isothiocyanates and cyclization of the resulting thioureas with DIC followed...
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