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Reaction of β-nitrostyrene 4 with cyclohexane-1,3-dione (5) in the presence of DBU affords the Michael-addition product 6, which is readily elaborated, using straightforward chemistry, to the 5,11-methanomorphanthridine 2, acquisition of which constitutes a formal total synthesis of the racemic modification of the montanine alkaloid pancracine (1).
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Banwell et al. (2001) studied this question.
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