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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

Table 2.

Dynamic resolution of 2·5 at −40 °C for 90 min

Entry Additional ligand Yield (%) 3 er (S:R)
1 TMEDA 73 80:20
2 TMEDA (0.1 equiv.) 68 80:20
3 TMEDA (2 equiv.) 59 77:23
4 none <10 50:50
5 Et3N 11 50:50
6 (−)-sparteine 1 27 50:50
7 PMDTA 56 59:41
8 Me2NCH2CH2OLi 31 53:47
9 TEEDA 8 83:17