Vorangegangene Arbeiten zeigten, daB die oxidative Cyclisierung von N-Benzyl-P-aminoketonen mit Cer(1V)sulfat in schwefelsaurer Losung eine sehr flexible Methode zum Aufbau von 1,2,3,4-Tetrahydroisochinolingerusten ist: 5-, 6-und 8-alkyl-, halogen-oder nitrosubstituierte Derivate2) sind ebenso darstellbar wie 4-spiro-Verbindungen3), Phenanthridinone4) und hoher oxidierte Analoga wie I -0xo-1 ,2-dhydroisochinoline5).
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