Abstract
Bioactive indolo[3,2-j]phenanthridine alkaloids, calothrixin A, B, and their analogues have been synthesized via formal cycloaddition of arynes and 2-aminophenanthridinedione as the key step, which proceeds through successive C–C/C–N bond formation and subsequent oxidation under transition-metal-free and mild conditions in the final stage of the synthesis.
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