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- W2046396741 abstract "Abstract The enantioselective α‐alkylation of 2‐naphthalenecarbaldehyde aldimine alanine tert ‐butyl ester is carried out by using N ‐anthracenylmethyl ammonium salts from the simple and unmodified cinchonidine and cinchonine alkaloids as phase‐transfer organocatalysts, which affords ( S )‐ and ( R )‐enantioenriched α‐methyl‐α‐amino acid (AMAA) derivatives in 71–98 % yield and 79–96 % ee . The employed reaction conditions, rubidium hydroxide as base and toluene/chloroform as solvent at –20 °C, allows higher enantioselectivities to be obtained than those previously obtained by using other Cinchona alkaloid‐derived ammonium salts, even with a lower catalyst loading (5 mol‐%). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)" @default.
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- W2046396741 date "2007-12-01" @default.
- W2046396741 modified "2023-10-14" @default.
- W2046396741 title "Convenient Conditions for the Enantioselective Synthesis of α‐Methyl‐α‐amino Acids with the Use of <i>Cinchona</i> Ammonium Salts as Phase‐Transfer Organocatalysts" @default.
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- W2046396741 doi "https://doi.org/10.1002/ejoc.200700925" @default.
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