Abstract
Spherical oxygenated heteropolycycles 3, containing stable acetal groups of a hitherto unknown type, can be obtained with surprising ease by the action of simple enamines 1 (n = 1–4) on the diketone 2. An ene addition is followed by a thermal [2 + 2 + 2] cycloaddition of the two carbonyl groups to the enamine double bond. Mor = morpholino.
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