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Turkish Journal of Chemistry, Vol.37, No.4, 492-518, 2013
Asymmetric synthesis of alpha-(heteroaryl)alkylamines and alpha-amino acids via nucleophilic 1,2-addition of lithiated heterocycles to aldehyde SAMP-hydrazones
The asymmetric synthesis of alpha-(heteroaryl)alkylamines was accomplished by employing a diastereoselective nucleophilic 1,2-addition of lithiated aromatic heterocycles to aldehyde SAMP-hydrazones, followed by BH3.THF or SmI2 promoted removal of the chiral auxiliary. The CBz or benzoyl-protected amines were obtained in good yields (40%-78%) and excellent enantiomeric excesses (ee = 88%-99%). The methodology can be applied to the synthesis of highly enantioenriched alpha-amino acids (ee = 90%-99%).