Bis-(2,5-diphenylphospholanes) with sp<sup>2</sup> Carbon Linkers: Synthesis and Application in Asymmetric Hydrogenation
作者:Martin E. Fox、Mark Jackson、Ian C. Lennon、Jerzy Klosin、Khalil A. Abboud
DOI:10.1021/jo7014938
日期:2008.2.1
chiral diphosphine ligands consisting of bis(2,5-diphenylphospholan-1-yl) groups connected by the sp2 carbon linkers 2,3-quinoxaline ((S,S)-Ph-Quinox), 2,3-pyrazine ((S,S)-Ph-Pyrazine), maleic anhydride ((S,S)-Ph-MalPhos), and 1,1‘-ferrocene ((S,S)-Ph-5-Fc) were synthesized, and their cationic [rhodium(I)(COD)] complexes were prepared. These complexes were tested in asymmetric hydrogenation of functionalized
四个由双(2,5-二苯基膦基-1-基)基团组成的手性二膦配体,它们通过sp 2碳连接基2,3,3-喹喔啉((S,S)-Ph-Quinox),2,3-吡嗪((小号,小号)-Ph -吡嗪),马来酸酐((小号,小号)-Ph-MalPhos),和1,1'-二茂铁((小号,小号)-Ph-5-FC)的合成,和它们的阳离子制备[铑(I)(COD)]配合物。这些配合物在官能化烯烃的不对称氢化中进行了测试。[((S,S)-Ph-Quinox)Rh(COD)] BF 4表现出对衣康酸酯和脱氢氨基酸底物的高活性和选择性。相应的(S,S)-Ph-吡嗪和(S,S)-Ph-MalPhos配合物表现出较低的活性和选择性。[[((S,S)-Ph-5-Fc)Rh(COD)] BF 4对这些底物表现出高活性且选择性低,但对2-C取代肉桂酸酯盐却具有高活性和选择性,而(S,S)-Ph-Quinox和(R,R)-Ph-BPE对2