All articles of this category Tricyclic ring system 6 , common central structure present in most Stemona alkaloids, was stereoselectively constructed through TMSOTf catalyzed condensation reaction of α- t -butyldioxypyrrolidine 13 with 3-methyl-2-trimethylsilyloxyfuran and subsequent azepane ring formation via intramolecular N -alkylation of iodide 17 . Stemona Alkaloid - 1-Azabicyclo[5.3.0]decane - α-Methyl-γ-lactone - threo -Selective - 3-Methyl-2-trimethylsilyloxyfuran
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Morimoto et al. (1995) studied this question.