An efficient protocol has been developed to synthesize various dihydro-1H-perimidine derivatives using commercially available Amberlyst-15 as a catalyst. Dihydro-1H-perimidine derivatives are potential candidates for pharmaceutical and high tech applications. The conspicuous features of this protocol are short reaction time, compared to higher product yield, easy recovery, reusability and regeneration of catalyst. The reaction was successfully scaled up to gram level, which reflects the practicability of the present protocol. (C) 2014 Elsevier B.V. All rights reserved.
Condensation of 1,3-diketones with 1,8-diaminonaphthalene: Synthesis ofbis(2,3-dihydroperimidine-2-spiro)cycloalkanes
Cyclic 1,3-diketones like cyclopentane-l,3-dione, cyclohexane-1,3-dione, and 5,5-dimethylcyclohexane-1,3-dione react with 1,8-diaminonaphthalene to afford new condensed heterocyclic spiro systems.