Abstract
AS part of a continuing programme of synthesis of condensed pyrimidine ring systems as potential antimetabolites and antitumour agents, the preparation of the hitherto unreported 1,5-pyrimido[4,5-b]-diazepine ring system (I) was undertaken in these laboratories1. This ring system is analogous to the 1,5-benzodiazepines extensively examined by a number of investigators2–8. The preparation of the pyrimidodiazepines (I) was attempted by condensation of 4,5-diaminopyrimidine derivatives with β-diketones, as in the synthesis of the corresponding 1,5-benzodiazepines 
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CHATTERJEE, S., TRITES, D. & MODEST, E. Structural Investigation of 4-[(4-Amino-5-pyrimidinyl)imino]-2-penten-2-ol. Nature 203, 970–971 (1964). https://doi.org/10.1038/203970a0
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DOI: https://doi.org/10.1038/203970a0
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