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Treatment of compounds 2 and 5, both from the C19-diterpenoid alkaloid deltaline 1, with 5% NaOH methanol (room temperature, 16 h) and NaOH-N,N-dimethylformamide (reflux, 10 h) led to the two novel skeletal rearrangement products 4 (90%) and 6 (62%), respectively, involving Wagner-Meerwein rearrangement and Grob fragmentation. Their structures were fully characteristized based on 2D NMR and HR-MS data.

Two Novel Skeletal Rearrangements Involving in the C Ring of C19-Diterpenoid Alkaloid Deltaline Derivatives