Several lamellarin alkaloids type III and analogues were synthesized using Barton–Zard and three-component reactions to construct the central pyrrole core.
Polysubstituted pyrrolidines/dihydropyrroles and the corresponding pyrrole derivatives were synthesized via three‐component/pseudo four‐component reaction of chalcone, benzylamine and benzaldehyde, and followed by DDQ oxidation. When exposed to UV light under aerobic conditions, the prepared pyrrole derivatives were found to be light‐sensitive and undergo oxidative ring‐opening reaction to yield the corresponding enamides.
A series of coumarin-annulated azepines were synthesized via acid-catalyzed condensation of 3-amino-4-hydroxycoumarin with two equivalents of substituted acetophenones in toluene with moderate to good yields.
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