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. Author manuscript; available in PMC: 2012 Sep 16.
Published in final edited form as: J Org Chem. 2011 Aug 24;76(18):7516–7527. doi: 10.1021/jo201319b

Scheme 5.

Scheme 5

Macrocyclization of 33 and x-ray structure of macroketolactone 35.a

a Reagents and conditions: (a) CSA, MeOH, 85%; (b) DMP, NaHCO3, 80%; (c) CrCl2, cat. NiCl2, DMSO, 50%; (d) DMP, Pyridine, 82%.