Preparation of new C2-symmetric tetraphosphine ligands for Rh-catalyzed asymmetric hydrogenation of arylenamides
作者:Dongbo Zhao、Zheng Wang、Kuiling Ding
DOI:10.1016/j.tetlet.2007.05.077
日期:2007.7
A new type of chiral tetraphosphine ligands 1 were prepared from enantiopure anti-head-to-head coumarin dimer 5 and then utilized in Rh-catalyzedasymmetrichydrogenation reaction of arylenamides, affording the corresponding amides with up to 85% ee. Some chiral bisphosphine ligands derived from coumarin dimer 5 were also evaluated in the same reaction.