Synthesis of two new heterocyclic ring systems: Benzo [3, 4] cyclohepta [1, 2??d]??pyrimidines and benzo [3, 4] cyclohepta [2, 1??d] pyrimidines

A Rosowsky, KKN Chen, M Lin…

Index: Rosowsky,A. et al. Journal of Heterocyclic Chemistry, 1971 , vol. 8, p. 789 - 795

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Citation Number: 12

Abstract

Abstract Three 2, 4-diamino-l (), 11-dihydro-9H-benzo [3, 4] cyclohepta [1, 2-d] pyrimidines (6a-6c) representing the first examples of a new ring system were synthesized from 2- benzosuberones and cyanoguanidine. Similarly, 2, 4-diamino-6, 7-dihydro-5H-benzo [3, 4] cyelohepta [2, 1-d] pyrimidine (24) was prepared from 1-benzosuberone. The ultraviolet spectral properties of these compounds were examined with reference to those of the ...