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. Author manuscript; available in PMC: 2012 Sep 1.
Published in final edited form as: Chem Sci. 2011 Jun 24;2(9):1706–1709. doi: 10.1039/C1SC00290B

Scheme 2.

Scheme 2

(f) 5 mol% IPrAuCl, 5 mol% AgSbF6, DCE, 45 °C; 88%. (g) LiHMDS, THF, −78 °C, 1 h; MeI, 1 h; 94% (2 : 1 dr). (h) DIBAL-H, toluene, − 78 °C, 6 h; 90%. (i) SO3·pyr, Et3N, 1 : 1 DMSO/CH2Cl2, 0 °C, 1 h; 75% (2 : 1 dr).