625096-45-9Relevant academic research and scientific papers
Iron(II) and zinc(II) complexes with designed pybox ligand for asymmetric aqueous Mukaiyama-aldol reactions
Jankowska, Joanna,Paradowska, Joanna,Rakiel, Bartosz,Mlynarski, Jacek
, p. 2228 - 2231 (2007/10/03)
An iron(II) complex with a hindered hydroxyethyl-pybox (he-pybox) ligand shows improved catalytic activity and enantioselectivity for asymmetric Mukaiyama-aldol reactions in aqueous media. This water-stable chiral Lewis acid promotes condensation of aroma
Chiral phosphoramide-catalyzed aldol additions of ketone trichlorosilyl enolates. Mechanistic aspects
Denmark, Scott E.,Pham, Son M.,Stavenger, Robert A.,Su, Xiping,Wong, Ken-Tsung,Nishigaichi, Yutaka
, p. 3904 - 3922 (2007/10/03)
The mechanism of the catalytic, enantioselective addition of trichlorosilyl enolates to aldehydes has been investigated. Kinetic studies using ReactIR and rapid injection NMR (RINMR) spectroscopy have confirmed the simultaneous operation of dual mechanist
Asymmetric mukaiyama-aldol reaction in aqueous media promoted by zinc-based chiral lewis acids
Mlynarski, Jacek,Jankowska, Joanna
, p. 521 - 525 (2007/10/03)
Asymmetric aldol reactions in aqueous media have been realized by using zinc-based chiral Lewis acids. The aldol products have been obtained with high yield, diastereocontrol and a good level of enantioselectivity. The reactivity of both acetophenone and
Enantioselective borohydride reduction catalyzed by optically active cobalt complexes
Yamada, Tohru,Nagata, Takushi,Sugi, Kiyoaki D.,Yorozu, Kiyotaka,Ikeno, Taketo,Ohtsuka, Yuhki,Miyazaki, Daichi,Mukaiyama, Teruaki
, p. 4485 - 4509 (2007/10/03)
The highly enantioselective borohydride reduction of aromatic ketones or imines to the corresponding alcohols was developed in the presence of a catalytic amount of an optically active cobalt(II) complex catalyst. This enantioselective reduction is carried out using a precisely premodified borohydride with alcohols such as tetrahydrofurfuryl alcohol, ethanol and methanol. High optical yields are obtained by choosing the appropriate alcohol as modifiers and a suitable β-ketoiminato ligand of the catalyst. The enantioselective borohydride reduction has been successfully applied to the preparation of optically active 1,3-diols, the stereoselective reduction of diacylferrocenes, and dynamic and/or kinetic resolution of 1,3-dicarbonyl compounds.
Novel chiral gallium Lewis acid catalysts with semi-crown ligands for aqueous asymmetric Mukaiyama aldol reactions
Li, Hui-Jing,Tian, Hong-Yu,Chen, Yong-Jun,Wang, Dong,Li, Chao-Jun
, p. 2994 - 2995 (2007/10/03)
Asymmetric Mukaiyama aldol reactions in aqueous media (water-ethanol = 9:1) were catalyzed by chiral gallium catalysts with semi-crown ligands to give aldol products with good yields, syn-diastereoselectivities and enantioselectivities.
Reductive desymmetrization of 2-alkyl-1,3-diketones catalyzed by optically active β-ketoiminato cobalt complexes
Ohtsuka, Yuhki,Koyasu, Kiichirou,Ikeno, Taketo,Yamada, Tohru
, p. 2543 - 2546 (2007/10/03)
(Equation presented) The reductive desymmetrization of acyclic 1,3-diketones was achieved for the first time by catalytic borohydride reduction in the presence of optically active β-ketoiminato cobalt(II) complex catalysts. In this reaction, various 2-sub
SYNTHETIC CONTROL LEADING TO CHIRAL COMPOUNDS
Mukaiyama, Teruaki,Iwasawa, Nobuharu,Stevens, Rodney W.,Haga, Toru
, p. 1381 - 1390 (2007/10/02)
A highly diastereoselective cross aldol reaction is developed using divalent tin enolates formed from stannous trifluoromethanesulfonate and carbonyl compounds.The reaction is extended to a highly enantioselective cross aldol reaction employing chiral dia
DIASTEREOSELECTIVE ALDOL CONDENSATIONS OF TIN ENOLATES WITH ALDEHYDES
Shenvi, Sharada,Stille, J. K.
, p. 627 - 630 (2007/10/02)
The reaction of tin enolates of cyclohexanone or propiophenone with benzaldehyde at -78 deg C gives predominately the threo aldol diastereomer.
