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2005
Enantioselective syntheses
O 0031
The Counterion Effect in the Phase-Transfer Catalyzed Asymmetric Synthesis
α-Amino Acids Promoted by Anthryl-Derived Dimeric Cinchona Ammonium
03- 036 of
Salts. — The nature of the counter ion in catalysts such as (I) or (II) is shown to have
a great influence on the final enantioselectivity during the asymmetric alkylation of the
protected aminoglycinate (III). Best results are obtained using the O-allylated hexafluorophosphates (Ic) or (IIb). — (CHINCHILLA, R.; MAZON, P.; NAJERA*, C.;
ORTEGA, F. J.; Tetrahedron: Asymmetry 15 (2004) 17, 2603-2607; Dep. Quim. Org.,
Fac. Cienc., Univ. Alicante, E-03080 Alicante, Spain; Eng.) — Kieslich
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