Axially Dissymmetric Bis(triaryl)phosphines in the Biphenyl series: Synthesis of (6,6′-dimethylbiphenyl-2,2′-diyl)bis(diphenylphosphine) (‘BIPHEMP’) and analogues, and their use in Rh(I)-catalyzed asymmetric isomerizations of<i>N,N</i>-diethylnerylamine
作者:Rudolf Schmid、Marco Cereghetti、Bernd Heiser、Peter Schönholzer、Hans-Jürgen Hansen
DOI:10.1002/hlca.19880710427
日期:1988.6.15
free diphosphine and of the derived Rh(I) complex, and for (−)-(R)- 13 by X-ray analysis of the derived Rh(I) complex. Configurational assignments for the substituted BIPHEMP analogues 1112 were achieved by means of 1H-NMR comparisons. The BIPHEMP ligand 10 and analogues 11, 12 and 13 are the first examples of optically active bis(triaylphosphines) containing the axially dissymmetric biphenyl moiety
轴向不对称二膦(-)-(R)-和(+)-(S)-(6-6'-二甲基联苯-2,2'-二基)双(二苯基膦)((-)-(R) -(10)和(+)-(S)-10 ;'BIPHEMP')是从(R)-和(S)-6,6'-二甲基联苯-2,2'-二胺((R)-和(S)-16)分别通过Sandmeyer反应,锂化和次膦酰基化。此外,外消旋的4,4'-二甲基-和4,4'-双(二甲基氨基)取代的类似物11和12分别合成了6,6'-桥接的类似物1,11-双(二苯基膦基)-5,7-二氢二苯并[ c,e ] oxepin (13)并拆分为光学纯的(R)-和(S)-对映异构体通过与二μ-chlorob络合是([R)-2- [1-(二甲基氨基)乙基] pheny- ç ñ }二钯(II)((- [R )- 18)。二膦(S)-10和(R)-13以及两种衍生的阳离子Rh(I)配合物[Rh((S)-10)(nbd)] BF