1,1â²-Binaphthyl-2,2â²-diamine-Based Chiral Phosphorous Triamides: Synthesis and Application in Asymmetric Catalysis
作者:Katalin Barta、Matthias Eggenstein、Markus Hölscher、Giancarlo Franciò、Walter Leitner
DOI:10.1002/ejoc.200900918
日期:2009.12
A set of chiral monodentate phosphorous triamides (PTA) comprising 1,1'-binaphthyl-2,2'-diamine as the common moiety have been synthesised. Electronic and steric tuning of the ligands was achieved by variation of the substituents at the diamine nitrogen atoms by incorporating methyl, p-tolyl and tosyl groups. Both chiral and achiral building blocks were used as monoamine components. Notably, (11bR)-3
已经合成了一组包含 1,1'-联萘-2,2'-二胺作为共同部分的手性单齿磷三酰胺 (PTA)。通过引入甲基、对甲苯基和甲苯磺酰基,通过改变二胺氮原子上的取代基来实现配体的电子和空间调节。手性和非手性结构单元都用作单胺组分。值得注意的是,(11bR)-3,5-二甲基-N,N-双[(S)-1-苯乙基]-3,5-二氢-4H-二萘并[2,1-d:1',2'-f ][1,3,2]diazaphosphepin-4-amine 是与 Feringa 亚磷酰胺配体最密切相关的 PTA,合成并通过 NMR 光谱和 X 射线衍射表征。与相应的亚磷酰胺相比,这种 PTA 显示出更高的构象刚性,并且在固态和溶液中均采用 C1 对称结构,即使在室温下也是如此。新的 PTA 配体用于铜催化的二乙基锌与环己-2-烯酮的共轭加成和镍催化的苯乙烯氢乙烯基化,在这两种反应中都具有良好的活性和化学选择性,并且具有中等的对映选择性。