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- W2950861596 abstract "The syntheses and resolutions of enantiomerically enriched 4-phenyl, 4-tert-butyl, and 4-isopropyl pipecolic acids are described. Optically active diastereomers were prepared by diastereomeric salt formation with the chiral base, l-tyrosine hydrazide, to provide Cbz or Boc protected 4-cis-d-pipecolic acid derivatives in >98% ee. Subsequent esterification followed by sodium methoxide catalyzed epimerization provided the isomeric 4-trans-l-pipecolic esters. In addition, an efficient synthesis of 4-phenyl-cis-pipecolic acid is described." @default.
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- W2950861596 date "1999-11-01" @default.
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- W2950861596 title "Synthesis of chiral nonracemic 4-trans-substituted pipecolic acid derivatives" @default.
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- W2950861596 doi "https://doi.org/10.1016/s0957-4166(99)00473-5" @default.
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