1454-57-5Relevant academic research and scientific papers
Hydroxyalkylation of Lithiated 3-[(S)-2(Methoxymethy)pyrrolidino]- 1,3-diphenylpropene - an Asymmetric Homoaldol Reaction - an
Ahlbrecht, Hubertus,Kramer, Andreas
, p. 1161 - 1168 (1996)
The hydroxyalkylation of lithiated 3-[(S)-2-(methoxymethyl)pyrrolidino]-l,3-diphenylpropene (2) with aldehydes is completely regioselective giving homoaldol adducts in good yields. The simple diastereoselectivity is low with typical ratios ranging between
Heterogeneous catalytic 1,4-addition of arylmagnesium compounds to chalcones
Juhász, Kinga,Hell, Zoltán
supporting information, p. 3136 - 3138 (2018/07/13)
Copper(II) on a 4 ? molecular sieve support catalyses the chemoselective addition of alkyl- and arylmagnesium halides to chalcones. Only the 1,4-addition products were obtained in high yields.
Enantioselective conjugate addition of diethylzinc to enones with chiral copper-QUIPHOS catalyst influence of the addition of water on the enantioselectivity
Delapierre, Guillaume,Constantieux, Thierry,Brunel, Jean Michel,Buono, Gerard
, p. 2507 - 2511 (2007/10/03)
The use of a new chiral copper catalyst involving QUIPHOS as ligand in the 1,4-addition of Et2Zn to enones is reported. The dramatic beneficial effect of addition of water or Zn(OH)2 to this system has been investigated, and led to a
Tetraorganogallate complexes in organic chemistry: Michael addition to α, β-unsaturated compounds
Han, Ying,Huang, Yao-Zeng,Fang, Lei,Tao, Wen-Tian
, p. 867 - 876 (2007/10/03)
Tetraorganogallate complexes, prepared in situ by addition of an organolithium reagent to a triorganogallium, reacted smoothly with α,β- unsaturated compounds to give Michael addition products in high yields, and mixed gallates display very high chemoselectivity in the transfer of one of their ligands.
A chiral (alkoxy)methyl-substituted silicon group as an auxiliary for the stereoselective cuprate addition to α,β-unsaturated ketones: Synthesis of (-)-(R)-phenyl 2-phenylpropyl ketone
Bratovanov, Svetoslav,Bienz, Stefan
, p. 1587 - 1603 (2007/10/03)
The [(benzyloxy)methyl](tert-butyl)methylsilyl group was used as the chiral auxiliary to effect highly diastereoselective conjugate additions of organocuprates to enones. Thus, reaction of several R2CuLi with α-silylated α,β-unsaturated ketones
71. Enantioselective Copper-Catalyzed 1,4-Addition of Grignard Reagents to α,β-Unsaturated Carbonyl Compounds
Spescha, Maurus,Rihs, Grety
, p. 1219 - 1230 (2007/10/02)
The enantioselective copper-catalyzed 1,4-addition of Grignard reagents to α,β-unsaturated carbonyl compounds was studied with the following Cu(I) compounds as catalyst precursor and 1,2:5,6-di-O-isopropylidene-3-thio-α-D-glucofuranose (Hsiig) as chiral l
Mechanism of the Grignard Adddition Reaction. XVI. Homolytic and Concerted Mechanisms in the Reaction of α,β-Unsatureted Carbonyl Compounds with Grignard Reagents
Holm, Torkil
, p. 925 - 929 (2007/10/02)
Kinetic measurements have shown that the addition of Grignard reagents to α,β-unsaturated carbonyl compounds takes place either by a concerted mechanism or by a homolytic mechanism.Phenylmagnesium bromide, which is incapable of homolysis, reacts rapidly in a 1,4-fashion if an s-cis conformation exists between the C=C and the C=O bonds, but only 1,2-addition takes place if the conformation is s-trans.tert-Butylmagnesium bromide is unsuited to the concerted reaction, but 1,4-addition takes place via homolysis.Primary and secondary Grignard reagents, like phenyl, react rapidly in a concerted manner with s-cis substrates, but unlike phenyl, these Grignard reagents may, with s-trans substrates, produce some 1,4-adduct via the homolytic mechanism.
Direct Michael-Type Addition of Si-Groups to α,β-unsaturated β-Aryl-Substituted Enones with R3SiCl/Bu2Cu(CN)Li2
Amberg, Willi,Seebach, Dieter
, p. 2439 - 2444 (2007/10/02)
(E)-5-Benzylidene-2-tert-butyl-6-methyl-1,3-dioxan-4-one (1) undergoes conjugative silylation (Me3Si, Et3Si, tBuMe2Si, Me2PhSi, products 2-5) with the reagent specified in the title.The reaction is highly diastereoselective, with formal anti addition of R
