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Treatment of lappaconitine 1 with HIO4 at room temperature afforded 2 in 41% yield, to which Br2-HOAc solution was added and allowed to stand at room temperature for 2 days to give 3 (13%) and 4(31%).
Treatment of lappaconitine 1 with HIO4 at room temperature 2 for 41% yield, to which Br2-HOAc solution was added and allowed to stand at room temperature for 2 days to give 3 (13%) and 4 (31%).