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Radical debromination and synthesis of compound 61 en route to cortistatin A.
Key: a) Ac2O, pyridine, DMAP, CH2Cl2 (70% from 42); b) Br2, H2O, THF, 0 °C; c) AIBN, n-Bu3SnH, C6D6, 70 °C, ~10% from 58; d) CeCl3•7H2O, NaBH4, MeOH, 0 °C; e) Ac2O, pyridine, DMAP, CH2Cl2.
