作者:Christine F. Czauderna、Alexandra M.Z. Slawin、David B. Cordes、Jarl Ivar van der Vlugt、Paul C.J. Kamer
DOI:10.1016/j.tet.2018.10.070
日期:2019.1
Two modular syntheticapproaches for the preparation of novel wide bite angle diphosphine ligands containing stereogenic P-atoms have been developed, leading to compounds (S,S)-2,2′-bis(methylphenylphosphino)diphenyl ether (L1) and (S,S)-2,2′-bis(ferrocenylphenylphosphino)diphenyl ether (L2) in very good diastereomeric ratios. Both protocols involve diphenyl ether as backbone and (2RP,4SC,5RC)-(+)-3
已开发出两种用于制备包含立体P原子的新型宽咬角二膦配体的模块化合成方法,从而产生了化合物(S,S)-2,2'-双(甲基苯基膦基)二苯醚(L1)和(S,S)-2,2'-双(二茂铁基苯基膦基)二苯醚(L2)的非对映异构体比例非常好。两种方案都涉及以二苯醚为骨架和(2 R P,4 S C,5 R C)-(+)-3,4-二甲基-2,5-二苯基-1,3,2-氧杂氮磷硼烷硼烷(R P) - 5作为诱导磷的手性的初始助剂。中间体(S,S)-9-(BH 3)2和(R,R)-10-(BH 3)2以及配体(S,S)-L1-BH3和(S,通过X射线晶体学分析确定S 1 -L 2。
Phosphine-Rh<sub>2</sub>[(<i>R</i>)-MTPA]<sub>4</sub> Adducts in Solution: Characterization by NMR Spectroscopy and Chiral Discrimination
作者:Damian Magiera、Jan Omelanczuk、Kamil Dziuba、K. Michał Pietrusiewicz、Helmut Duddeck
DOI:10.1021/om0209529
日期:2003.6.1
characterized in solution by 1H and 31P NMR spectroscopy at room temperature. A differentiation of the enantiomers of chiral phosphine ligands is easily performed by NMR signal integration after adduct formation with the enantiopure Rh2[(R)-(+)-MTPA]4 complex (Rh*). Stereochemical aspects are discussed in terms of chiral discrimination and adduct diastereomerism. A second type of chiral recognition was