| Abstract
| - Electrophilic cyclization of amino ketals 14a and14b with 6 M HCl at 23 °C, followed byoxidationwith air in 6 M HCl at 100 °C, gave tetrahydrophenanthridines16a and 16b, respectively, whichwere transformed into the pyrrolophenanthridinium salts 1aand 1b. Compound 1b was showntobe the correct structure of the Narcissus pallidulusconstituent, roserine.
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