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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 19a.

Scheme 19a

aConditions: (a) TBAF (10 equiv), THF, rt, 1.5 h, <40%; b. MgBr2 (25 equiv), n-BuSH (23 equiv), Et2O, rt, 1 h, trace product. (c) MgBr2 (60 equiv), n-BuSH (60 equiv), MeNO2, Et2O, 0°C to rt, 3 h, >99%.