1268449-12-2Relevant academic research and scientific papers
Methylene-bridged bis(imidazoline)-derived 2-oxopyrimidinium salts as catalysts for asymmetric Michael reactions
Sheshenev, Andrey E.,Boltukhina, Ekaterina V.,White, Andrew J. P.,Hii, King Kuok
supporting information, p. 6988 - 6991 (2013/07/25)
In nothing flat: The title salts, having planar nitrogen centers, were utilized successfully as phase-transfer catalysts for asymmetric Michael reactions of tert-butyl glycinate benzophenone Schiff base with vinyl ketone and chalcone derivatives, thus providing excellent levels of diastereo- and enantiocontrol (see scheme). Copyright
NOVEL PHASE TRANSFER CATALYSTS
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Page/Page column 15-16; 18, (2012/05/19)
Compounds of formula (I): wherein R1 to R8, and X- are defined herein. Also disclosed are methods of making and using these compounds.
Pentanidium-catalyzed enantioselective phase-transfer conjugate addition reactions
Ma, Ting,Fu, Xiao,Kee, Choon Wee,Zong, Lili,Pan, Yuanhang,Huang, Kuo-Wei,Tan, Choon-Hong
supporting information; experimental part, p. 2828 - 2831 (2011/04/22)
A new chiral entity, pentanidium, has been shown to be an excellent chiral phase-transfer catalyst. The enantioselective Michael addition reactions of tert-butyl glycinate-benzophenone Schiff base with various α,β- unsaturated acceptors provide adducts with high enantioselectivities. A successful gram-scale experiment at a low catalyst loading of 0.05 mol % indicates the potential for practical applications of this methodology. Phosphoglycine ester analogues can also be utilized as the Michael donor, affording enantioenriched α-aminophosphonic acid derivatives and phosphonic analogues of (S)-proline.
A powerful synergistic effect for highly efficient diastereo- and enantioselective phase-transfer catalyzed conjugate additions
Hua, Ming-Qing,Wang, Lian,Cui, Han-Feng,Nie, Jing,Zhang, Xiao-Ling,Ma, Jun-An
supporting information; experimental part, p. 1631 - 1633 (2011/03/20)
An efficient, catalytic, diastereo- and enantioselective conjugate addition of N-(diphenylmethylene)glycine tert-butyl ester to β-aryl substituted enones was realized in the presence of 1 mol% of newly desired dinuclear N-spiro-ammonium salts, affording f
