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. Author manuscript; available in PMC: 2011 Jun 26.
Published in final edited form as: Tetrahedron. 2010 Jun 26;66(26):4745–4759. doi: 10.1016/j.tet.2010.03.093

Scheme 6a.

Scheme 6a

aConditions: (a) TES-Cl, pyridine, CH2Cl2, rt, 10 h, 84% or TIPS-Cl, imidazole, DMF, 90 °C, 10 h, 89%; (b) t-BuLi, THF, −78 °C to 0 °C, 30 min then Me2SiHCl, −78°C to rt, 1 h, 84−95% for 30 and 99% for 31; (c) [RuCl2(p-cymene)]2, CH3CN/H2O, 1 h, 70% for 32, and 2h, 61% for 11.