Porcine liver esterase (PLE)- or rabbit liver esterase (RLE)-catalyzed hydrolysis of the pro-S ester group of diethyl α-alkyl-α-(benzyloxycarbonylamino)malonates 2a-c afforded (R)-ethyl α-alkyl-α-(benzyloxycarbonylamino)malonates 3a-c each in excellent enatiomeric excess. Enantiodivergent reductions of these acid esters 3a-c readily furnished both the corresponding enantiomeric α-substituted serines
猪肝
酯酶(PLE)或兔肝
酯酶(RLE)催化的
二乙基α-烷基-α-(苄氧基羰基
氨基)
丙二酸酯2a-c的pro- S酯基
水解,得到(R)-乙基α-烷基-α -(苄氧羰基
氨基)
丙二酸酯各自以优异的对映体过量3a-c。这些酸酯3a-c的对映异构还原可容易地提供相应的对映体α-取代的
丝氨酸(R)-和。