A formal total synthesis of calothrixin B and its N-benzyl analogues has been accomplished from (2-chlorophenyl)boronic acid, 8-bromophenanthridine-7,10-dione and benzylamines. The synthesis involves Suzuki cross-coupling and copper-catalyzed domino reactions to generate N-benzylcalothrixins in good to moderate yields.
N. Ramkumar and R. Nagarajan, RSC Adv., 2015, 5, 87838 DOI: 10.1039/C5RA18120H
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