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. Author manuscript; available in PMC: 2009 Jan 8.
Published in final edited form as: J Am Chem Soc. 2006 Sep 13;128(36):11906–11915. doi: 10.1021/ja062364i

Table 1a.

graphic file with name nihms82032f16.jpg
entry donor solvent yield (%) (α/β)
1 22 CH2Cl2 85 (24) α only
2 23 PhMe/CH2Cl2 (3:1) 99 (25) 3:2
3 23 CHCl3 96 (25) 1:3
a

Reagents and conditions: (a) Ph2SO, Tf2O, TBP; add 20.