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- W2890952818 abstract "Chiral salalen ligands derived from (S)-proline and derivatives of salicyaldehydes were synthesized, and their in-situ generated Cu (II) complexes were evaluated in the asymmetric Henry reaction. Salalen ligand of different substituents on the phenyl moiety showed remarkable effect on the enantioselectivity of nitro-aldol product of 4-nitrobenzaldehyde and nitromethane. Cu (II) complex generated in situ with (S)-2-(tert-butyl)-6-((2-(((2-hydroxy-3-methylbenzylidene)amino)methyl)pyrrolidin-1-yl)methyl) phenol (10 mol%) and Cu (OAc)2 .H2 O (10 mol%), found to be better catalyst for nitro-aldol reaction between 4-nitrobenzaldehyde and nitromethane, gave corresponding product in 85% yield and 88% enantiomeric excess (ee) in isopropanol at 35°C after 40 hours. The catalyst also used for the Henry reaction with different substituted benzaldehydes and corresponding products were obtained in 22% to 99% yields with 66% to 92% ee. Henry reaction of 4-nitrobenzaldehyde and prochiral nitroethane gave anti-selective product (dr = 79/21; anti/syn) in a 91% yield with 80% ee." @default.
- W2890952818 created "2018-09-27" @default.
- W2890952818 creator A5032247867 @default.
- W2890952818 creator A5074820200 @default.
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- W2890952818 date "2018-09-20" @default.
- W2890952818 modified "2023-10-14" @default.
- W2890952818 title "Synthesis of chiral salalen ligands and their in-situ generated Cu-complexes for asymmetric Henry reaction" @default.
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- W2890952818 doi "https://doi.org/10.1002/chir.23019" @default.
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- W2890952818 hasPublicationYear "2018" @default.
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