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Synthesis of chiral spirocyclo-quaternary ammonium salts from L-proline and their application as phase-transfer catalysts in asymmetric alkylation
Na Wang, Song-Wen Lin, Qing Yang, Qi Sun*, Run-Tao Li*
. 2011, (1): 26 -31 .  DOI: 10.5246/jcps.2011.01.003