Synthesis, structure, and catalytic activity of a new zinc complex derived from a chiral hydroxyazetidine ligand
作者:Zhanbin Zhang、Ning Zhao、Wenshan Ren、Liang Chen、Haibin Song、Guofu Zi
DOI:10.1016/j.inoche.2012.03.015
日期:2012.6
tetrameric zinc complex [(1)ZnEt]4 (2) has been readily prepared via alkane elimination between ZnEt2 and a chiral azetidine derivative, (2R,3R)-1-[(1S)-1-(4-methoxyphenyl)ethyl]-2-phenyl-3-hydroxyazetidine (1H). Complex 2 has been characterized by various spectroscopic techniques, elemental analyses, and X-ray diffraction analysis. Complex 2 has a cubane-like Zn4O4 core structure, and is an active
Process for the preparation of .beta.-phenylisoserine and .beta.-lactam
申请人:Rhone-Poulence Rorer S.A.
公开号:US05939561A1
公开(公告)日:1999-08-17
The present invention relates to new process for the preparation of .beta.-phenylisoserine and its analogues of general formula: ##STR1## which are particularly useful for preparing taxane derivatives which have remarkable antitumour and antileukaemic activities.
作者:Yolanda Pérez-Fuertes、James E. Taylor、David A. Tickell、Mary F. Mahon、Steven D. Bull、Tony D. James
DOI:10.1021/jo200528s
日期:2011.8.5
A practically simple three-component Strecker reaction for the asymmetric synthesis of enantiopure alpha-arylglycines has been developed. Addition of a range of aryl-aldehydes to a solution of sodium cyanide and (S)-1-(4-methoxyphenyl)ethylamine affords highly crystalline (S,S)-alpha-aminonitriles that are easily obtained in diastereomerically pure form. Heating the resultant (S,S)-alpha-aminonitriles in 6 M aqueous HCl at reflux resulted in cleavage of their chiral auxiliary fragments and concomitant hydrolysis of their nitrile groups to afford enantiopure (S)-alpha-arylglycines. The enantiopurities of these (S)-a-arylglycines were determined via derivatization of their corresponding methyl esters with 2-formylphenylboronic acid and (S)-BINOL, followed by H-1 NMR spectroscopic analysis of the resultant mixtures of diastereomeric iminoboronate esters.