New P-stereogenic triaminophosphines and their derivatives: synthesis, structure, conformational study, and application as chiral ligands
摘要:
The synthesis, structural, and conformational studies of new P-chiral triaminophosphines, which feature an indolidine and a 1,2,3,4-tetrahydroquinolidine pattern, respectively, are reported. These compounds can feature very different 3D-structures, although they both could be seen a priori as close derivatives of the previously reported 3-phenyl-1,3-diaza-2-phosphabicyclo[3.3.0]octane. The consequences for the use of such compounds and their derivatives in asymmetric metal-catalysis are discussed on the basis of preliminary results in asymmetric cobalt-catalyzed [6+2] cycloaddition. (C) 2010 Elsevier Ltd. All rights reserved.
Catalytic asymmetric borane reduction of prochiral ketones by the use of diazaborolidine catalysts prepared from chiral β-diamines
摘要:
The catalytic asymmetric borane reduction of prochiral ketones was examined in the presence of chiral diazaborolidine catalysts prepared in situ from chiral P-diamines and borane. Chiral secondary alcohols were obtained with modest to high enantiomeric excesses (up to 92% ee) using (S)-2-[(4-trifluoromethyl)anilinomethyl]indoline 2f. (C) 2000 Elsevier Science Ltd. All rights reserved.
The catalytic asymmetric borane reduction of prochiralketones was examined in the presence of chiral β-diamines. Chiral secondary alcohols were obtained with modest to high enantiomeric excesses (up to 92% ee) using (S)-2-[(p-trifluoromethyl)anilinomethyl]indoline.
The catalytic asymmetric borane reduction of prochiral ketones was examined in the presence of chiral diazaborolidine catalysts prepared in situ from chiral P-diamines and borane. Chiral secondary alcohols were obtained with modest to high enantiomeric excesses (up to 92% ee) using (S)-2-[(4-trifluoromethyl)anilinomethyl]indoline 2f. (C) 2000 Elsevier Science Ltd. All rights reserved.
New P-stereogenic triaminophosphines and their derivatives: synthesis, structure, conformational study, and application as chiral ligands
The synthesis, structural, and conformational studies of new P-chiral triaminophosphines, which feature an indolidine and a 1,2,3,4-tetrahydroquinolidine pattern, respectively, are reported. These compounds can feature very different 3D-structures, although they both could be seen a priori as close derivatives of the previously reported 3-phenyl-1,3-diaza-2-phosphabicyclo[3.3.0]octane. The consequences for the use of such compounds and their derivatives in asymmetric metal-catalysis are discussed on the basis of preliminary results in asymmetric cobalt-catalyzed [6+2] cycloaddition. (C) 2010 Elsevier Ltd. All rights reserved.