Synthesis and application of bulky phosphoramidites: highly effective monophosphorus ligands for asymmetric hydrosilylation of styrenes
作者:Feng Zhang、Qing-Hua Fan
DOI:10.1039/b909334f
日期:——
A series of bulky monodentate phosphoramidite ligands were synthesized from chiral 3,3′-diaryl substituted BINOL derivatives and achiral or dendritic amines in good yields. Asymmetric hydrosilylation of styrenes with trichlorosilane in the presence of palladium complexes of these bulky ligands gave chiral silanes in high yields with excellent activity and productivity. Oxidation of these chiral silanes
Enantioselective Catalytic Conjugate Addition of Dialkylzinc Reagents using Copper–Phosphoramidite Complexes; Ligand Variation and Non-linear Effects
作者:Leggy A Arnold、Rosalinde Imbos、Alessandro Mandoli、André H.M de Vries、Robert Naasz、Ben L Feringa
DOI:10.1016/s0040-4020(00)00142-3
日期:2000.4
cyclohexenone and chalcone in order to assess the structural features that are important for stereocontrol. A sterically demanding amine moiety is essential to reach high e.e.’s. Enantioselectivities for chalcones up to 89% and for cyclic enones up to 98% were found. Studies on non-linear effects with the best ligands for both cyclohexenone and chalcone showed clear non-linear effects for both cyclic
New five-coordinate Ru(ii) phosphoramidite complexes and their catalytic activity in propargylic amination reactions
作者:Andria K. Widaman、Nigam P. Rath、Eike B. Bauer
DOI:10.1039/c1nj20520j
日期:——
The first five-coordinate, square-pyramidal ruthenium complexes of the general formula [RuCl2(PPh3)2L] have been prepared, where L is a phosphoramidite ligand. The new complexes were employed as catalysts for the amination reactions of propargylic esters (18 h, at room temperature or 45 °C, Cs2CO3) to give propargylic amines in isolated yields up to 94%.
Modular chiral dendrimers with monodentatephosphoramiditeligands located at the core were synthesized and applied in the Rh-catalyzed asymmetric hydrogenations, afforded unprecedented enhancement of enantioselectivity.
THIAZOLYLIDINE UREA AND AMIDE DERIVATIVES AND METHODS OF USE THEREOF
申请人:Faghih Ramin
公开号:US20090163470A1
公开(公告)日:2009-06-25
The invention relates to novel thiazolylidine urea and amide derivatives that are PAMs of neuronal nicotinic receptors, compositions comprising the same, processes for preparing such compounds, and methods for using such compounds and compositions.