C2-Symmetric bisphosphinites and a bisaminophosphine as new chiral ligands for Pd-catalyzed asymmetric allylic substitution
摘要:
A family of C-2-symmetric bisphosphinites 3, 5, 7, 9 and bisaminophosphine 11 were prepared and were probed in the prototypical reaction system of palladium-catalyzed asymmetric allylic substitution. The highest ee of 86% was achieved by employing ligand 3. (C) 2000 Elsevier Science Ltd. All rights reserved.
C2-Symmetric bisphosphinites and a bisaminophosphine as new chiral ligands for Pd-catalyzed asymmetric allylic substitution
摘要:
A family of C-2-symmetric bisphosphinites 3, 5, 7, 9 and bisaminophosphine 11 were prepared and were probed in the prototypical reaction system of palladium-catalyzed asymmetric allylic substitution. The highest ee of 86% was achieved by employing ligand 3. (C) 2000 Elsevier Science Ltd. All rights reserved.
Catalytic enantioselective synthesis of secondary alcohols using C2-symmetric diamino diol ligands
作者:Biao Jiang、Yan Feng、Jian-Feng Hang
DOI:10.1016/s0957-4166(01)00409-8
日期:2001.9
A newclass of diamino diols was evaluated as catalytic ligands in the enantioselective borane reduction of aromatic ketones and the enantioselective ethylation of arylaldehydes with diethylzinc. By variation of the substitution pattern on the ketone, e.e.s of up to 94% could be obtained by in situ borane reduction using 0.025 equiv. of the ligand at 35°C in THF. N,N,N′,N′-Tetramethyldiamino diol and
C2-Symmetric bisphosphinites and a bisaminophosphine as new chiral ligands for Pd-catalyzed asymmetric allylic substitution
作者:Ao Zhang、Yan Feng、Biao Jiang
DOI:10.1016/s0957-4166(00)00267-6
日期:2000.8
A family of C-2-symmetric bisphosphinites 3, 5, 7, 9 and bisaminophosphine 11 were prepared and were probed in the prototypical reaction system of palladium-catalyzed asymmetric allylic substitution. The highest ee of 86% was achieved by employing ligand 3. (C) 2000 Elsevier Science Ltd. All rights reserved.