کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
65723 | 48401 | 2014 | 5 صفحه PDF | دانلود رایگان |
• New chiral iminopyridines were obtained from pyridyl and quinolinyl aldehydes.
• New chiral iminopyridines were obtained from a variety of chiral or achiral amines.
• New ligands were assessed in the enantioselective Pd-catalyzed allylic substitution.
• 1,3-Diphenylprop-2-enylmalonate was obtained with enantioselectivities up to 62% ee.
A variety of iminopyridines were obtained by condensation of chiral amines with pyridine-2-carboxaldehyde and quinoline-8-carbaldehyde, or of aminoalkylpyridine derivatives with chiral ketones. These ligands were assessed in the enantioselective palladium catalyzed allylic substitution of 1,3-diphenylprop-2-enyl acetate with dimethyl malonate affording the product dimethyl 1,3-diphenylprop-2-enylmalonate in good yields and moderate enantioselectivities (up to 62% ee). Catalytic activity and enantioselectivity were found to be highly dependent upon the steric properties of the ligands. The best enantioselectivity (62% ee) was obtained by an iminopyridine based on a camphane skeleton.
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Journal: Journal of Molecular Catalysis A: Chemical - Volume 385, April 2014, Pages 73–77