Die aus Arylidenpiperidonen (I) durch Umsetzung mit Guanidin (II) hergestellten Amino‐hexahydropyridopyrimidine(III) lassen sich mit Kaliumhexacyanoferrat(III) u A/mino‐tetrahydrppyridopyrimidinen (IV) oxidieren.

209ChemInform Abstract The chalcones (Ia)-(Ic) react with dithiocarbamic acid to give the open-chain addition products (III), whereas in the case of (Id) the reaction with (II) affords the thiazinethione (V). Dehydration of (III) or (V) leads to the dihydrothiazinethiones (IV) or (VI). A ring structure for the products obtained from the addition reaction with dithiocarbamic acid (as was previously assumed for the product of the reaction of (Ia) (Z2: -H) and (II)) can be excluded by IR spectroscopy.

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Die basenkatalysierte Reaktion der Arylidencycloulkanoire (I) mit Guanidin (II) liefert die anellierten Aminopyrimidine (III).

Die Synthese der Titelverbindungen (II), (V), (VI), (VIII) und (IX) wird beschrieben.