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. Author manuscript; available in PMC: 2011 Mar 17.
Published in final edited form as: J Am Chem Soc. 2007 Jul 31;129(33):10098–10099. doi: 10.1021/ja073987e

Table 1.

Optimization of Conditionsa

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entry temperature (°C) azolium salt yield (%)b ee (%)c
1 23 A 47 −83
2 23 B 38 −76
3 23 C 45 51
4 23 D 40 94
5d 23 D 66 94
6d 40 D 80 93
7d,e 40 D 70 93
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a

See Supporting Information for reaction details.

b

Isolated yield.

c

Determined by HPLC using Chiracel AD-H column.

d

Careful exclusion of oxygen.

e

5 mol % of D.