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. Author manuscript; available in PMC: 2016 Mar 24.
Published in final edited form as: Nat Prod Rep. 2015 Feb;32(2):328–347. doi: 10.1039/c4np00051j

Scheme 12.

Scheme 12

Reagents and conditions (a) 96 AcOH, CH2Cl2/CF3CH2OH (7:1), MS3A, 20 h (84%); (b) AllocCl, NaHCO3, CH2Cl2, rt, 2 h (88%); (c) bromide, Cs2CO3, DMF, rt, 3 h (86%); (d) Ac2O, pyridine, DMAP, CH2Cl2, rt, 1 h (92%); (e) TFA, CH2Cl2, rt (72%).