کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1347663 | 980320 | 2008 | 8 صفحه PDF | دانلود رایگان |
Chiral ferrocenyl tridentate phosphine ligands were synthesized and used in asymmetric hydroamination reactions catalyzed by Ni(II)-complexes. Compounds of the type [Ni(PPP)L]2+, where L is a chloride, solvent molecule or a coordinated substrate, were isolated. The efficiency of these complexes in asymmetric catalysis was high when aliphatic or aromatic amines were reacted with electron-poor olefins, especially with acrylonitrile derivatives. This hydroamination reaction affords up to 95% enantioselectivity at −80 °C for the addition of morpholine to methacrylonitrile (69% ee at room temperature).
Figure optionsDownload as PowerPoint slide
(+)-[2-(R)-Methyl-3-(morpholinium)propanenitrile][(S)-1,1′-binaphthyl-2,2′-diylphosphate]C28H27N2O5P[α]D = +335.2 (c 1, CH2Cl2)Absolute configuration: (S,R)
(−)-[2-(R)-Methyl-3-(morpholinium)propanenitrile][(R)-1,1′-binaphthyl-2,2′-diylphosphate]C28H27N2O5P[α]D = −337.3 (c 1, CH2Cl2)Absolute configuration: (R,R)
(−)-[3-(R)-(Phenylammonium)butanenitrile][(R)-1,1′-binaphthyl-2,2′-diylphosphate]C30H25N2O4P[α]D = −204.2 (c 1, CH2Cl2)Absolute configuration: (R,R)
Journal: Tetrahedron: Asymmetry - Volume 19, Issue 22, 17 November 2008, Pages 2555–2562