Abstract
The base-catalyzed intramolecular Diels–Alder reactions of 2-diphenylphosphinyl-5-(propargyloxymethyl)furans 2a– e gave the tetrahydrofuran ring annulated o-diphenylphosphinophenols 3a– e in 70–80% yields, a novel reaction involving an intramolecular Diels–Alder reaction of furan diene with allenyl ether dienophile followed by a nucleophilic 1,2-rearrangement of the diphenylphosphinyl group.
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