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• W2024143306 endingPage "232" @default.
• W2024143306 startingPage "227" @default.
• W2024143306 abstract "A series of trialkylsilyl groups containing ligands have been prepared from C2 symmetric 2,6-bis(oxazolinyl)pyridine (pybox-hm) (2a) bearing a hydroxymethyl group on the oxazoline ring. 1, 3-Dipolar cycloaddition reaction of nitrones and oxazolidinone derivatives in the presence of sterically tuned bis(oxazolinyl)pyridine (pybox-tbdmsom 2b, -tipsom 2c and -tbdpsom 2d) and Ni(II) complexes as a Lewis acid catalyst proceeded smoothly to give the corresponding cycloadducts in 97:3 to >99:1 of endo/exo ratio and 97 to >99% ee for the endo adduct. Steric tuning of the chiral environment of pybox ligands was simply achieved by using silyl protecting groups of the hydroxyl groups. The solubility of the new pybox series 2b–d in organic solvent is dramatically increased; hence, the efficiency of these catalysts enhanced the rate of nitrone 1,3-dipolar cycloaddition. Furthermore, these ligands can make a single-coordinated Ni(pybox) as a catalyst, since clear linear effect between the enantiopurity of the ligand 2c and product 6a was observed." @default.
• W2024143306 created "2016-06-24" @default.
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• W2024143306 date "2002-01-01" @default.
• W2024143306 modified "2023-10-16" @default.
• W2024143306 title "Chiral bis(trialkylsiloxymethyloxazolinyl)pyridine ligands. Highly enantioselective 1,3-dipolar cycloaddition reactions" @default.
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• W2024143306 doi "https://doi.org/10.1016/s0040-4020(01)01129-2" @default.
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