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. Author manuscript; available in PMC: 2014 Dec 25.
Published in final edited form as: Chem Commun (Camb). 2013 Dec 25;49(99):11588–11619. doi: 10.1039/c3cc47368f

Scheme 80.

Scheme 80

Asymmetric formation of spirocyclopenteneoxindoles, catalyzed by (+)-Ph-BPE.

a Yield and ee of the major diastereoisomer. b Dr 3.7:1:0.7:0.04. c Dr 2:1:0.2:0.2. d Reaction performed with 20 mol % 121 at −20 °C.