723335-44-2Relevant academic research and scientific papers
Enantioselective protonation in the aza-Michael reaction using a combination of chiral Pd-μ-hydroxo complex with an amine salt
Hamashima, Yoshitaka,Tamura, Toshihiro,Suzuki, Shoko,Sodeoka, Mikiko
, p. 1631 - 1634 (2009)
A highly enantioselective protonation of enolate intermediates in aza-Michael reaction was achieved by using the combination of a bifunctional chiral Pd-μ-hydroxo complex with aromatic amine salts. The reaction proceeded smoothly to give the desired β-ami
Scope and mechanism of tandem aza-michael reaction/enantioselective protonation using a Pd-Iμ-Hydroxo complex under mild conditions buffered with amine salts
Hamashima, Yoshitaka,Suzuki, Shoko,Tamura, Toshihiro,Somei, Hidenori,Sodeoka, Mikiko
experimental part, p. 658 - 668 (2011/10/12)
The tandem aza-Michael reaction/enantioselective protonation of α-substituted α,β-unsaturated carbonyl compounds is described in detail. The key to success is the combined use of a Bronsted basic palladium-Iμ-hydroxo complex and amine salts, which allows for the controlled generation of active catalyst and nucleophilic free amines. This catalytic system was applicable to various acceptors and aromatic amines, and the desired β-amino acid derivatives with a chiral center at the α position were produced in good yield with excellent enantioselectivity (up to 98% ee). For electron-deficient amines, the introduction of free amine as an additive was effective in promoting the reaction. The results of mechanistic studies, including determination of the absolute configuration of the product, are discussed. Salt-controlled reaction: The tandem aza-Michael reaction/ enantioselective protonation of α-substituted α,β-unsaturated carbonyl compounds is described in detail. The combined use of chiral palladium complex 1 and amine salts was critical to obtain α-substituted β-amino carbonyl compounds with high enantioselectivity (see scheme). Copyright
