Light-induced addition reactions of cyclopentenone derivatives with ethylene, followed by elaboration of the alkyl chains a t positions 8 and 12, give bicyclic prostanoic acid analogues belonging to the prostaglandin E, and Fza series. Cycloaddition of ethylene to prostaglandin A2 methyl ester yields simultaneously the IX-and p-cycloadducts. Photochemical addition of allene to prostaglandin A, derivatives affords mixtures of photoadducts which vary with the nature of the functional group a t position 15, thus illustrating the versatility of these photocondensation reactions.
2,5,6‐Trisubstituierte und 2,6‐disubstituierte 4‐(2‐Oxo‐alkyliden)‐Pyrane setzen sich mit Hydroxylamin zu Oximen von 4‐(2‐Oxo‐alkyliden)‐Pyridin‐N‐oxiden oder/und Isoxazolinen um.
Durch Überführung des Hydroxyjodlactons (I) in das ungesättigte Lacton (II), alkalische Öffnung des Lactonringes, Veresterung der entstehenden Hydroxysäure (IIIa) und Chromsäureoxidation des Methylesters (IIIb) wird das Enon (IV) dargestellt.
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