The chiral phosphoric acid catalyzed enantioselective transferhydrogenation of various ketimines was achieved by the use of 2-aryl indoline as the hydrogen donor. Corresponding chiral amines were obtained in good chemical yields with excellent enantioselectivities.
Enantioselective organocatalytic reductive amination of aliphatic ketones by benzothiazoline as hydrogen donor
作者:Kodai Saito、Takahiko Akiyama
DOI:10.1039/c2cc31486j
日期:——
The chiral phosphoric acid-catalyzed enantioselectivereductiveamination of aliphatic ketones with aromatic amines was successfully achieved by the use of benzothiazoline as the hydrogen donor. Corresponding chiral aliphatic amines were obtained with excellent enantioselectivities.
Asymmetric reduction of ketimines with trichlorosilane employing an imidazole derived organocatalyst
作者:François-Moana Gautier、Simon Jones、Stephen J. Martin
DOI:10.1039/b816051a
日期:——
Organocatalysts for the asymmetric reduction of ketimines are presented that function well at low catalyst loadings providing chiral amines in good yield and enantioselectivity, the latter appearing to be independent of the ketimine substrate geometry.
Enantiomericallypure chiral amines are of increasing importance and commercial value in the fine chemical, pharmaceutical, and agrochemical industries. Here, we describe the straightforward synthesis of chiral amines by combining the atom‐economic and environmentally friendly hydroamination of alkynes with an enantioselective hydrogenation of in situ generated imines by using inexpensive hydrogen
Organocatalysis with a Fluorous Tag: Asymmetric Reduction of Imines with Trichlorosilane Catalyzed by Amino Acid-Derived Formamides
作者:Andrei V. Malkov、Marek Figlus、Sigitas Stončius、Pavel Kočovský
DOI:10.1021/jo062215i
日期:2007.2.1
Asymmetricreduction of ketimines 1 with trichlorosilane can be catalyzed by N-methylvaline-derived Lewis-basic formamides 3a−d with high enantioselectivity (≤95% ee) and low catalyst loading (1−5 mol %) at room temperature in toluene. Appending a fluorous tag, as in 5a−c, simplifies the isolation procedure, while preserving high enantioselectivity (≤92% ee).