Beilstein J. Org. Chem.2025,21, 1786–1790, doi:10.3762/bjoc.21.140
, condensation of N-sulfonylated 1,2-diphenylethane-1,2-diamines and cyclohexane-1,2-dicarboxylic acid, and the final cyclization with the in situ generated Hendrickson reagent.
Keywords: bisimidazoline; cyclohexane; cyclohexane-1,2-dicarboxylic acid; 1,2-diphenylethane-1,2-diamine; Introduction
Chiral
alcohols and utilized in different metal-catalyzed asymmetric organic reactions [1][2][3][4][5][6][7][8][9]. In comparison with bisoxazoline ligands, relatively less attention has been paid to bisimidazoline ligands [10][11][12][13][14][15]. Some well investigated bisimidazoline ligands are pyridine-linked
bisimidazoline (PyBim) ligands derived from pyridine-2,6-dicarbonitrile or pyridine-2,6-dicarboxylic acid and vicinal diamines, as analogues of pyridine-linked bisoxazoline (PyBOX) ligands [16][17]. They exhibited excellent performance in metal-catalyzed asymmetric organic reactions. Chiral rigid backbone-linked
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Graphical Abstract
Figure 1:
Bisoxazoline and bisimidazoline ligands.