Nickel-Catalyzed Asymmetric Transfer Hydrogenation of Hydrazones and Other Ketimines
作者:Haiyan Xu、Peng Yang、Pratanphorn Chuanprasit、Hajime Hirao、Jianrong Steve Zhou
DOI:10.1002/anie.201501018
日期:2015.4.20
We report the use of nickel catalysts for the catalytic transferhydrogenation of hydrazones and otherketimines with formic acid. Strongly donating bisphosphines must be used to support the catalysts. As in enzymatic catalysis, attractive weak interactions may be important for stereochemical control by the nickel/binapine catalyst.
Ligands and complexes for enantioselective hydrogenation
申请人:Degussa-Huels Aktiengesellschaft
公开号:US06191284B1
公开(公告)日:2001-02-20
A ferroceneylphosphine ligand and complexes prepared therefrom for homogeneous catalytic enantioselective hydrogenation, the ligand having the formula (I):
Another aspect of the invention is directed to a ferroceneylphosphine ligand of formula (II),
An efficient multicomponent one-pot reaction was developed for the synthesis of ,-disubstituted homoallylic hydrazides by treating ketones, acylhydrazines and allyl bromide with tin powder in tetrahydrofuran under reflux. The reaction proceeds smoothly without any catalyst under mild conditions to give the corresponding products in high yields.
Mack, H. Michael; Davis, Everette A.; Kadkhodayan, Babak, Journal of Heterocyclic Chemistry, 1987, vol. 24, p. 1733 - 1740
作者:Mack, H. Michael、Davis, Everette A.、Kadkhodayan, Babak、Taylor, Richard A.、Duncan, Dean C.、Beam, Charles F.
DOI:——
日期:——
Synthesis of a New Class of Chiral 1,5-Diphosphanylferrocene Ligands and Their Use in Enantioselective Hydrogenation
A new family of ferrocenylphosphane ligands has been prepared. Their flexible synthesis allows many structural modifications. The asymmetric induction of these ligands was examined in the hydrogenation of functionalized C=C, C=O, and C=N bonds. The enantioselectivity of the reaction was strongly dependent on the substituent R at the position alpha to the ferrocene moiety. In many cases, both enantiomeric