Organocatalytic Asymmetric Domino Knoevenagel/Diels-Alder Reactions: A Bioorganic Approach to the Diastereospecific and Enantioselective Construction of Highly Substituted Spiro[5,5]undecane-1,5,9-triones
D. B. Ramachary, Dr., Naidu S. Chowdari, Dr., Carlos F. Barbas III,
Angewandte Chemie International Edition Volume 42 Issue 35, Pages 4233 - 4237
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http://dx.doi.org/10.1002/anie.200351916Benjamin List, Chris Castello Synlett 2001; 2001: 1687-1689
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http://dx.doi.org/10.1055/s-2001-18095