Synthesis, stereochemistry, and thermolysis of ss-aminoalkylboranes
erythro- and threo-ss-Amino boranes Mes2BCHMeCHPh-NHPh were synthesized by the reaction of Mes2BCHMeLi with N-benzylideneaniline. The stereochemistry was determined by chemical derivation into the corresponding cyclic carbamates via ss-amino alcohols. Their thermolysis gave a mixture of the corresponding (E)-enamine and its tautomer, (E)-imine, in sharp contrast to that of ss-hydroxy boranes giving the olefins.
Asymmetric reduction of ketimines with trichlorosilane employing an imidazole derived organocatalyst
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.
Gautier, Franois-Moana,Jones, Simon,Martin, Stephen J.
supporting information; experimental part
p. 229 - 231
(2009/03/11)
Ti(NMe2)4-catalyzed Markovnikov hydroamination of alkynes in the presence of N-heterocyclic carbenes and LiN(SiMe3)2
Intermolecular hydroamination of alkynes catalyzed by Ti(NMe2)4 was much improved with N-heterocyclic carbenes and LiN(SiMe3)2, by which high Markovnikov selectivity was attained for the coupling of nearly all a
L-piperazine-2-carboxylic acid derived N-formamide as a highly enantioselective Lewis basic catalyst for hydrosilylation of N-aryl imines with an unprecedented substrate profile
L-Piperazine-2-carboxylic acid derived N-formamides have been developed as highly enantioselective Lewis basic catalysts for the hydrosilylation of N-aryl imines with trichlorosilane. The arene sulfonyl group on N4 was found to be critical for the high en
S-chiral sulfinamides as highly enantioselective organocatalysts
(Diagram presented) Easily accessible chiral sulfinamide 2 has been developed as the first highly efficient and enantioselective organocatalyst relying solely on a chiral sulfur center for stereochemical induction. In the presence of 20 mol % of 2, a broa
New C-N and C-C bond forming reactions catalyzed by titanium complexes
Titanium(iv) complexes with two basic dimethylamido ligands can be efficient catalysts for alkyne hydroamination by primary amines. Readily prepared pyrrolyl ligands have proven to be especially useful in generating active catalysts for hydroamination and
Odom, Aaron L.
p. 225 - 233
(2007/10/03)
Oxidative rearrangement of ketimines to amides by MCPBA and BF3·OEt2
Several amides were obtained by an efficient method from the corresponding alkyl aryl ketimines in high yields. Ketimines are readily prepared from the corresponding ketones. This procedure involves the oxidation of alkyl aryl ketimines with MCPBA with BF3·OEt2. In this reaction, only aryl group of alkyl aryl ketimines was migrated to the electron deficient nitrogen atom.
Kim, So Yeon,An, Gwang-Il,Rhee, Hakjune
p. 112 - 114
(2007/10/03)
More Articles about upstream products of 67888-69-1