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. Author manuscript; available in PMC: 2008 Sep 6.
Published in final edited form as: J Am Chem Soc. 2006 Oct 18;128(41):13346–13347. doi: 10.1021/ja0648108

Table 4.

Quaternary Center Formation

graphic file with name nihms-63701-t0006.jpg
Entry R Yield %a drb ee, % c
1 i-Propyl 13a 77 99:1 70
2 c-Pentyl 13b 90 99:1 69
a

Isolated yield.

b

Diastereomer ratio determined by 1H NMR (400 MHz).

c

Determined by chiral HPLC.