Synthesis of 2-aryl-2,3-dihydro-4-styrylpyrimidodiazepines in the reaction of 4,5,6-triaminopyrimidine and 2,4,5,6-tetraaminopyrimidine with diarylidenacetones |
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| Authors: | Braulio Insuasty Henry Insuasty Jairo Quiroga Manuel Nogueras Adolfo Snchez M Dolores Lpez |
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| Institution: | Braulio Insuasty,Henry Insuasty,Jairo Quiroga,Manuel Nogueras,Adolfo Sánchez,M. Dolores López |
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| Abstract: | New 6-amino and 6,8-diamino-2-aryl-2,3-dihydro-4-styryl-1H-pyrimido4,5-b]1,4]diazepines were obtained in the reaction of 2,4,5,6-tetraaminopyrimidine 1a and 4,5,6-triaminopyrimidine 1b with one equivalent of the diaryli dene acetones 2 in absolute ethanol with acetic acid as the catalyst. Structure analysis of 6-amino and 6,8-diamino-2-aryl-2,3-dihydro-4-styryl-1H-pyrimido4,5-b]1,4]diazepines 3a-i, determined by detailed nmr measurements, reveals a high regioselectivity of this reaction. |
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