Browsing by Autor "Norbert Hanold"
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Item type: Item , ChemInform Abstract: The Formation of Pyrazolo(1,5‐a)pyrimidines by the Reaction of 3‐(4‐ Chlorophenyl)pyrazol‐5‐amine with Chalcones.(Wiley, 1995) Jairo Quiroga; Braulio Insuasty; Ricardo Rincon; Marina Larrahondo; Norbert Hanold; Herbert MeierAbstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.Item type: Item , The formation of pyrazolo[1,5‐<i>a</i>]pyrimidines by the reaction of 3‐(4‐chlorophenyl)pyrazol‐5‐amine with chalcones(Wiley, 1994) Jairo Quiroga; Braulio Insuasty; Ricardo Rincon; Marina Larrahondo; Norbert Hanold; Herbert MeierAbstract Cyclocondensation reactions of the pyrazol‐5‐amine 1 and the 1‐aryl‐3‐phenyl‐2‐propen‐1‐ones 2a‐d yield the 6,7‐dihydropyrazolo[1,5‐ a ]pyrimidines 7a‐d . Whereas 7a‐c can be isolated in pure state, 7d is subjected to a spontaneous oxidation.Item type: Item , The reaction of aromatic α,β‐unsaturated ketones with 4,5‐diamino‐1,6‐dihydropyrimidin‐6‐ones(Wiley, 1994) Braulio Insuasty; MÓNica Ramos; Jairo Quiroga; Adolfo Sánchez; Manuel Nogueras; Norbert Hanold; Herbert MeierAbstract The reaction of 4,5‐diamino‐1,6‐dihydropyrimidin‐6‐ones 1 with one equivalent of the chalcones 2 leads in an acidic medium to the formation of the 2,4‐diaryl‐2,3,6,7‐tetrahydro‐1 H ‐pyrimido[4,5‐ b ][1,4]diazepin‐6‐ones 3a‐m . The structure elucidation of the products is based on detailed nmr investigations including selective 13 C[ 1 H] decoupling experiments.