New amino-dithiaphospholanes and phosphoramidodithioites and their rhodium and iridium complexes
作者:Pushkar Shejwalkar、Sergey L. Sedinkin、Eike B. Bauer
DOI:10.1016/j.ica.2010.11.006
日期:2011.1
on the spectroscopic properties of their rhodium and iridium complexes was investigated. The new ligands Bn 2 NPSCH 2 CH 2 S a ( P - S a ) (Bn = benzyl, 4 ), Bn 2 NPSCHCHS a (CH 2 ) 3 C a H 2 ( P - S a )( C a - S a ) ( 6 ) and Bn 2 NP(4-XC 6 H 4 OMe) 2 (X = S, 7a ; X = O, 7b ) were converted to the rhodium and iridium complexes trans -[Rh(CO)Cl(L) 2 ] (L = 4 , 6 , 7 ), [RhCl(COD)(L)] (L = 4 , 6 , 7
摘要合成了亚磷酰胺配体的新硫衍生物,研究了硫单元对其铑和铱配合物光谱性质的影响。新的配体Bn 2 NPSCH 2 CH 2 S a(P-SA)(Bn =苄基,4),Bn 2 NPSCHCHS a(CH 2)3 C a H 2(P-SA)(C a-S a )(6)和Bn 2 NP(4-XC 6 H 4 OMe)2(X = S,7a; X = O,7b)转化为铑和铱配合物反式-[Rh(CO)Cl(L) 2](L = 4,6,7),[RhCl(COD)(L)](L = 4,6,7),[IrCl(COD)(7a)]和[IrCl 2 Cp ∗(6)] 。为了比较,还合成了这些制剂的一些亚磷酰胺配合物。光谱分析了新的金属配合物。对于羰基配合物,其v CO IR拉伸频率低于相应的亚磷酸酯和亚磷酰胺配体。具有新配体的铑配合物的1 J PRh耦合常数也小于相应的亚磷酰胺和亚磷酸盐配合物的1 J PRh耦合常数。最后,新配体的硒化物的1
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
BINOL-derived phosphoramidites enabled a regioselective phosphorylation of myo-inositol. The method was applied for the first total synthesis of a protozoan lysophosphatidylinositol, EhPIa.
An unprecedented Pd-catalyzed asymmetric intramolecular cascade cyclization of aryl halides with readily available arylboronic acids proceeds through a Heck-type dearomative cyclization terminated with arylation in the presence of Pd2(dba)3 (10 mol %), Cu2O (5 mol %), and Cs2CO3 (2.0 equiv) in 1,2-dichloroethane (1.0 mL) at 100 °C for 15 h in air using BINOL-based phosphoramidite as the chiral ligand