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. Author manuscript; available in PMC: 2011 Apr 12.
Published in final edited form as: Tetrahedron. 2009 Aug 22;65(34):3771–6803. doi: 10.1016/j.tet.2009.05.079

Table 3.5.

cis-β-Lactone formation with lanthanide cocatalyst.

graphic file with name nihms-194367-t0031.jpg

Entry R Ar ee (%) dr Yield (%)
1 Ph Ph >99 88:12 58
2 Ph p-Br-Ph >99 88:12 55
3 Ph m-Cl-Ph >99 92:8 88
4 Bn p-CN-Ph >99a 87:13 68
a

Runs with catalyst 6d, yields opposite enantiomer.