ChemInform Abstract: PURINES, XII. CYCLIZATION OF 4‐ALKYLAMINO‐5‐NITROSOURACILS AND SYNTHESIS OF 8‐SUBSTITUTED XANTHINES AND BIS(THEOPHYLLIN‐8‐YL)ALKANE DERIVATIVES
Abstract:Nitrosierung der aus entsprechenden Komponenten (I) und (II) erhältlichen Aminouracile (III) liefert die Derivate (IV) (die Darstellung der labilen Nitrosoverbindungen (IVb) und (IVc) gelingt nur durch Umsetzung in Isoamylnitrit/Alkohol), deren Cyclisierungstendenz zu Xanthinen wie (V) bzw. (VI) in Abhängigkeit von der Substituentengröße an N‐3 mit Hilfe der Differential‐Thermogravimetrie untersucht wird.
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