An Efficient Synthesis of Optically Pure (<i>R</i>)- and (<i>S</i>)-2-(aminomethyl)alanine ((<i>R</i>)- and (<i>S</i>)-ama) and (<i>R</i>)- and (<i>S</i>)-2-(aminomethyl)leucine ((<i>R</i>)- and (<i>S</i>)-aml)
An efficient synthesis of enantiomerically pure (R)- and (S)-2-(aminomethyl)alanine ((R)- and (S)-Ama) 1a and (R)- and (S)-2-(aminomethyl)leucine ((R)- and (S)-Aml) 1b is described (Schemes 1 and 2). Resolution of the racemic amino acids was achieved using L-phenylalanine cyclohexylamide (2) as chiral auxiliary. The free amino acids 1a, b were converted to the Nα-Boc,Nγ-Z-protected derivatives 11a