Abstract: The hemilabile chiral C2 symmetrical bidentate substituted amide ligands (1R,2R)-5a-d and (1S,2S)-6a-d were synthesized in quantitative yield from (1R,2R)-(+)-3-methylenecyclo-propane-1,2-dicarboxylic acid (1R,2R)-3 and (1S,2S)-(-)-3-methylene-cyclopropane-1,2-dicarboxylic acid (1S,2S)-3, in two steps, respectively. The chiral Feist’s acids (1R,2R)-3 and (1S,2S)-3 were obtained in good isomeric purity by resolution of trans-(±)-3-methylene-cyclopropane-1,2-dicarboxylic acid from an 8:2 mixture of tert-butanol and water, using (R)-(+)-α-methylbenzyl amine as a chiral reagent. This process is reproducible on a large scale. All these new synthesized chiral ligands were characterized by 1H-NMR, 13C-NMR, IR, and mass spectrometry, as well as elemental analysis and their specific rotations were measured. These new classes of C2 symmetric chiral bisamide ligands could be of special interest in asymmetric transformations.
Keywords: resolution of Feist’s acid; bisamide ligand; C2 symmetric
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Al Majid, A.M.A.; Islam, M.S.; Al-Othman, Z.A.; Al-Salhoob, A.F.; Barakat, A. Synthesis and Characterization of Some New C2 Symmetric Chiral Bisamide Ligands Derived from Chiral Feist’s Acid. Molecules 2012, 17, 5550-5563.
Al Majid AMA, Islam MS, Al-Othman ZA, Al-Salhoob AF, Barakat A. Synthesis and Characterization of Some New C2 Symmetric Chiral Bisamide Ligands Derived from Chiral Feist’s Acid. Molecules. 2012; 17(5):5550-5563.
Al Majid, Abdullah M. A.; Islam, Mohammad Shahidul; Al-Othman, Zeid A.; Al-Salhoob, Ahlam F.; Barakat, Assem. 2012. "Synthesis and Characterization of Some New C2 Symmetric Chiral Bisamide Ligands Derived from Chiral Feist’s Acid." Molecules 17, no. 5: 5550-5563.