Treatment of chalcone-epoxide 1 with lithium tetramethylpiperidide gives two anions: enolate 3 and the remote anion 4 which upon formation, 4 adds to unreacted starting material 1 to yield the diastereoisomeric products 5 and 6.
A. Baramee, J. Clardy, P. Kongsaeree, S. Rajviroongit, C. Suteerachanon, C. Thebtaranonth and Y. Thebtaranonth, Chem. Commun., 1996, 1511 DOI: 10.1039/CC9960001511
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