Z -α-乙酰氨基Z酸甲酯(MAC),2-乙酰氨基丙烯酸甲酯(M-丙烯酸酯)和4-甲基-3-乙酰氨基-2-丙酸乙酯(E-EMAP)的三种前手性底物的催化加氢与络合的铑前体据报道,在氢气压力为1–30 bar的情况下,使用手性二膦的化合物。使用了56个手性二膦的文库,包括23个BINAP衍生物,7个JOSIPHOS,5个BIPHEP,3个DUPHOS衍生物和18个其他配体。尽管人们普遍认为,高氢气压力会导致较低的ee s,但现在已在统计基础上证明,对ee的有益和有害压力影响之间的等效分布普遍存在,并且氢压对映性的影响不是孤立的现象,因为所研究的反应体系中有33%以上受到强烈影响。在某些情况下,仅施加较高的氢气压力即可将对映选择性提高至97%。建议将这些结论扩展到其他非手性试剂。
C1-symmetric bisphosphine ligands and their use in the asymmetric synthesis of pregabalin
申请人:Bao Jian
公开号:US20050228190A1
公开(公告)日:2005-10-13
Materials and methods for preparing (S)-(+)-3-(aminomethyl)-5-methyl-hexanoic acid and structurally related compounds via enantioselective hydrogenation of prochiral olefins are disclosed. The methods employ novel chiral catalysts, which include C
1
-symmetric bisphosphine ligands bound to transition metals.
Highly Efficient Asymmetric Synthesis of β-Amino Acid Derivatives via Rhodium-Catalyzed Hydrogenation of β-(Acylamino)acrylates
作者:Guoxin Zhu、Zhaogen Chen、Xumu Zhang
DOI:10.1021/jo990565h
日期:1999.9.1
Further insight in the minor/major concept using hydrogen pressure effect in asymmetric hydrogenation
作者:A. Aloui、F. Delbecq、P. Sautet、C. De Bellefon
DOI:10.1016/j.molcata.2012.06.012
日期:2012.11
The catalytic system prepared from [Rh(COD)(2)]BF4 and (R,R)-Me-BPE provides a spectacular detrimental hydrogen pressure effect on ee from 94% down to 56% in the hydrogenation of methylacrylate, whereas it has a strong beneficial effect on the hydrogenation of E-emap (from 42% up to 72%). The kinetic parameters have been determined for both systems and have helped to identify the most enantioselective controlling steps (MECS). Accordingly, further explanations for the structure-ee and hydrogen pressure relationship are proposed. (c) 2012 Elsevier B.V. All rights reserved.
C1-SYMMETRIC BISPHOSPHINE LIGANDS AND THEIR USE IN THE ASYMMETRIC SYNTHESIS OF PREGABALIN
申请人:Warner-Lambert Company LLC
公开号:EP1727620A1
公开(公告)日:2006-12-06
C1-Symmetric Bisphospine Ligands and Their Use in the Asymmetric Synthesis of Pregabalin
申请人:Bao Jian
公开号:US20090124820A1
公开(公告)日:2009-05-14
Materials and Methods for preparing (S)-(+)-3-(aminomethyl)-5-methyl-hexanoic acid and structurally related compounds via enantioselective hydrogenation of prochiral olefins are disclosed. The methods employ novel chiral catalysts, which include C
1
-symmetric bisphosphine ligands bound to transition metals.