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. Author manuscript; available in PMC: 2009 Oct 20.
Published in final edited form as: Chem Commun (Camb). 2009 Aug 6;(35):5239–5241. doi: 10.1039/b911024k

Scheme 2.

Scheme 2

i, n-BuLi (1.2 equiv.), Et2O, alone or with 2 equiv. TMEDA, −78 °C, 1 h then 4 (1 equiv.) then warm to temperatures listed in text and Supporting Information for various times; ii, cool to −78 °C, TMSCl.