212776-37-9Relevant academic research and scientific papers
Towards a universal organocatalyst for the synthesis of enantioenriched phenylalanine derivatives by enantioselective decarboxylative protonation
Pigeaux, Morgane,Laporte, Romain,Harrowven, David C.,Baudoux, Jér?me,Rouden, Jacques
supporting information, p. 4599 - 4603 (2016/09/23)
Access to enantioenriched non-proteogenic phenylalanine derivatives is described using the enantioselective decarboxylative protonation reaction of amidohemimalonate esters catalysed by various cinchona-based compounds. This study compares the catalytic efficiency as well as the enantioselectivity induced by three types of common organocatalysts, namely thioureas, squaramides and bis-cinchona squaramides. One of the main outcome of this work is the observation of a significant influence of the N-protecting group of the hemimalonate on its interaction with the catalyst. This methodology carried out under mild conditions exhibits good substrate scope and functional group tolerance. A substoichiometric amount of catalyst can also be used in certain cases while affording good yields and selectivities.
New enantiodivergent procedure for the syntheses of chiral α- substituted serines from α-alkyl-α-aminomalonates utilizing enzymatic hydrolysis
Sano, Shigeki,Hayashi, Kazuhiko,Miwa, Toshio,Ishii, Takahiro,Fujii, Michiho,Mima, Hiromi,Nagao, Yoshimitsu
, p. 5571 - 5574 (2007/10/03)
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 enantiomeric excess. Enantiodivergent reductions of these acid esters 3a-c readily furnished both the corresponding enantiomeric α-substituted serines (R)- and (S)-5a-c.
