Examining the effect of hemilabile donor groups in non-C2 symmetrical terdentate ligands
摘要:
The type and position of donor atoms in proline-derived, non-C-2 symmetric, terdentate ligands are found to have significant effects on the enantioselectivity of the palladium-catalysed allylic substitution reaction. (C) 2002 Elsevier Science Ltd. All rights reserved.
ABSTRACT A convenient and effective synthesis of enantiomerically pure macrocyclic dioxopolyamine 3 and its derivatives 4–9 is presented. Macrocyle 3, derived from l-proline, was prepared in high overall yield and easily modified. 8 and 9 were prepared by modified Mannich reaction in good yields.
Two chiral fluorescence receptors 1 and 2 have been synthesized, and their structures characterized by IR, H-1 NMR, MS spectra and elemental analysis. The chiral recognition of the receptors was studied by 1H NMR and fluorescence spectra. The results demonstrate that the receptors and tetrabutyl ammonium mandelate formed a 1:1 complex. Two receptors exhibit good chiral recognition abilities towards the enantiomers of tetrabutylammonium mandelate. (C) 2005 Elsevier Ltd. All rights reserved.
Examining the effect of hemilabile donor groups in non-C2 symmetrical terdentate ligands
作者:Hubert Lam、Xiaohui Cheng、Jonathan W. Steed、David J. Aldous、King Kuok (Mimi) Hii
DOI:10.1016/s0040-4039(02)00988-7
日期:2002.8
The type and position of donor atoms in proline-derived, non-C-2 symmetric, terdentate ligands are found to have significant effects on the enantioselectivity of the palladium-catalysed allylic substitution reaction. (C) 2002 Elsevier Science Ltd. All rights reserved.
The Absolute Configuration of the C<sub>8</sub>-Atom in the Pyrrolizidine Moieties of the Senecio Alkaloids