656233-47-5Relevant academic research and scientific papers
Development of Axially Chiral Cyclo-Biaryldiol Ligands with Adjustable Dihedral Angles
Zhang, Pengxiang,Yu, Jipan,Peng, Fei,Wu, Xudong,Jie, Jiyang,Liu, Can,Tian, Hua,Yang, Haijun,Fu, Hua
supporting information, p. 17477 - 17484 (2016/11/23)
A new type of axially chiral cyclo-[1,1′-biphenyl]-2,2′-diol (CYCNOL) ligands with adjustable dihedral angles have been developed by varying the bridge chain length. Eight-, nine- and ten-membered cyclo-ligands were prepared and evaluated by using two representative examples: enantioselective additions of diethylzinc to aldehydes and organometallic reagents to enones. The results revealed that the fine regulation of dihedral angles through variation of the bridge chain length was effective in the asymmetric synthesis.
Highly enantioselective copper-catalyzed conjugate addition of diethylzinc to enones using chiral spiro phosphoramidites as ligands
Zhou, Hai,Wang, Wen-Hu,Fu, Yu,Xie, Jian-Hua,Shi, Wen-Jian,Wang, Li-Xin,Zhou, Qi-Lin
, p. 1582 - 1584 (2007/10/03)
Novel monodentate chiral spiro phosphoramidite ligands have been readily synthesized in good yields from enantiomerically pure 1,1′-spirobiindane-7,7′-diol. The new ligands were highly efficient in the copper-catalyzed conjugate addition of Et2
