Oxazoline Mediated Routes to a Unique Amino-acid, 4-Amino-13-carboxy[2.2]paracyclophane, of Planar Chirality
摘要:
Efficient syntheses leading to 4-amino-13-carboxy[2.2]paracyclophane and derivatives are described. Novel oxazolinyl[2.2]paracyclophanes are used as intermediates and the oxazolinyl and amide groups are shown to be strong psi-geminal directing groups. Compounds with potential as catalysts have been made. (C) 2000 Elsevier Science Ltd. All rights reserved.
Oxazoline Mediated Routes to a Unique Amino-acid, 4-Amino-13-carboxy[2.2]paracyclophane, of Planar Chirality
摘要:
Efficient syntheses leading to 4-amino-13-carboxy[2.2]paracyclophane and derivatives are described. Novel oxazolinyl[2.2]paracyclophanes are used as intermediates and the oxazolinyl and amide groups are shown to be strong psi-geminal directing groups. Compounds with potential as catalysts have been made. (C) 2000 Elsevier Science Ltd. All rights reserved.
Regulation of the flexibility of planar chiral [2.2]paracyclophane ligands and its significant impact on enantioselectivity in asymmetric reactions of diethylzinc with carbonyl compounds
作者:Xun-Wei Wu、Tang-Zhi Zhang、Ke Yuan、Xue-Long Hou
DOI:10.1016/j.tetasy.2004.06.026
日期:2004.8
A series of planarchiral ligands derivedfrom [2.2]paracyclophane were synthesized and applied as catalysts in enantioselective additions of diethylzinc to aldehydes and α,β-unsaturated ketones. When ligand 10 with a dimethyl hydroxymethyl as the substituent was used, the enantioselectivity of the reaction of diethylzinc with aldehydes was much higher than when using ligand 3c with diphenyl hydroxymethyl