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Abstract
The titled compound 2 was readily prepared by thermal desulfonylation of 3-(phenylthio)-3-sulfolene (1). The aza-Diels-Alder reactions of 2 with some simple iminium salts gave the cyclized products 3–7 in good yield with complete control of regiochemistry.
ACKNOWLEDGMENTS
Financial support of this work by the National Science Council of the Republic of China is gratefully acknowledged (NSC 88-2113-M-030-005).