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All total 6 Articles be found
Recyclable Ligands for the Non-Enzymatic Dynamic Kinetic Resolution of Challenging α-Amino Acids
Nian, Yong,Wang, Jiang,Zhou, Shengbin,Wang, Shuni,Moriwaki, Hiroki,Kawashima, Aki,Soloshonok, Vadim A.,Liu, Hong
supporting information, p. 12918 - 12922 (2015/11/02)
Structurally simple and inexpensive chiral tridentate ligands were employed for substantially advancing the purely chemical dynamic kinetic resolution (DKR) of unprotected racemic tailor-made α-amino acids (TM-α-AAs), enabling the first DKR of TM-α-AAs bearing tertiary alkyl chains as well as multiple unprotected functional groups. Owing to the operationally convenient conditions, virtually complete stereoselectivity, and full recyclability of the source of chirality, this method should find wide applications for the preparation of TM-α-AAs, especially on large scale. The non-enzymatic dynamic kinetic resolution of racemic α-amino acids bearing tertiary alkyl chains and multiple unprotected functional groups is based on the enantioselective formation of nickel(II) complexes and their hydrolysis under convenient conditions. The specially designed chiral ligands are inexpensive and can be quantitatively recycled.
PROCESS FOR THE PREPARATION OF ENANTIOMERICALLY PURE tert-LEUCINE
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, (2012/10/08)
Enantiomerically pure L-tert-leucine and D-tert-leucine were prepared from (DL)-tert-leucine by diastereomeric salt formation using dibenzoyl-d-tartaric acid as the resolving agent.
Catalytic asymmetric acylcyanation of imines
Pan, Subhas Chandra,Zhou, Jian,List, Benjamin
, p. 612 - 614 (2008/02/01)
(Chemical Equation Presented) The less problematic acetyl cyanide can be used instead of toxic HCN for the highly enantioselective acyl-Strecker-type reaction. In the presence of an N-benzylimine and a catalytic amount of Jacobsen's catalyst 1, the desire