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2005
Amino acids
U 0400
Evidence of the Electronic Factor for the Highly Enantioselective Catalytic Effiof Cinchona-Derived Phase-Transfer Catalysts. — Derivatives (I) of cin33- 227 ciency
chona alkaloids are developed as electronically modified version of chiral phase transfer catalysts. Considerable enhancement concerning the catalytic efficiency in the
enantioselective phase transfer alkylation of the glycine anion equivalent (II) is observed. (Ia) and (Ib) are applied to the alkylation of (II) with various alkyl halides and
excellent enantioselectivities (97-99% e.e.) are obtained for both nonactive aliphatic
and active alkyl halides. — (YOO, M.-S.; JEONG, B.-S.; LEE, J.-H.; PARK*, H.-G.;
JEW*, S.-S.; Org. Lett. 7 (2005) 6, 1129-1131; Res. Inst. Pharm. Sci., Coll. Pharm.,
Seoul Natl. Univ., Kwanak, Seoul 151-742, S. Korea; Eng.) — R. Steudel
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