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. Author manuscript; available in PMC: 2013 Aug 13.
Published in final edited form as: J Med Chem. 2010 Sep 23;53(18):6730–6746. doi: 10.1021/jm100898v

Scheme 7a.

Scheme 7a

aReagents: (a) 1,1′-Azobis(cyanocyclohexane), benzyl mercaptan, 1,4-dioxane, 90 °C; (b) 36% aq. HCl, MeOH, room temperature; (c) Formaldehyde, 9-DAA, 1,4-dioxane, H2O, room temperature.