Nickel-Catalyzed Asymmetric Transfer Hydrogenation of Olefins for the Synthesis of α- and β-Amino Acids
作者:Peng Yang、Haiyan Xu、Jianrong Steve Zhou
DOI:10.1002/anie.201407744
日期:2014.11.3
The field of asymmetric (transfer) hydrogenation of prochiral olefins has been dominated by noble metal catalysts based on rhodium, ruthenium, and iridium. Herein we report that a simple nickel catalyst is highly active in the transfer hydrogenation using formic acid. Chiral α‐ and β‐amino acid derivatives were obtained in good to excellent enantioselectivity. The key toward success was the use of
Synthesis of β-Amino Acid Derivatives via Copper-Catalyzed Asymmetric 1,4-Reduction of β-(Acylamino)acrylates
作者:Yan Wu、Shan-Bin Qi、Fei-Fei Wu、Xi-Chang Zhang、Min Li、Jing Wu、Albert S. C. Chan
DOI:10.1021/ol200287z
日期:2011.4.1
A new set of reaction conditions has been established to facilitate the copper-catalyzed enantioselective 1,4-reduction of β-(acylamino)acrylates toward a selection of β-alkyl-β-amino acid derivatives in high yields and with uniformly high ee values (up to 99%) irrespective of the use of (E)- or (Z)-substrates.
asymmetric hydrogenation of 13 different β-dehydroaminoacid derivatives to give optically active β-amino acidesters has been examined. Readily accessible monodentate octahydrobinaphthol-based phosphoramidites were used as chiral ligands. Good to excellent enantioselectivities and yields were obtained for the E isomers, whereas poorer catalyst performance was found for the Z isomers. Importantly, to obtain
Phosphite‐thioether/selenoether Ligands from Carbohydrates: An Easily Accessible Ligand Library for the Asymmetric Hydrogenation of Functionalized and Unfunctionalized Olefins
phosphite‐thioether/selenoether ligands has been easily prepared from accessible L‐(+)‐tartaric acid and D‐(+)‐mannitol and applied in the M‐catalyzed (M=Ir, Rh) asymmetrichydrogenation of a broad number of substrates (46 in total). Its highlymodular architecture has been crucial to maximize the catalytic performance. Improving most of the reported approaches, this ligand family presents a broad substrate
Novel and Efficient Chiral Bisphosphorus Ligands for Rhodium-Catalyzed Asymmetric Hydrogenation
作者:Wenjun Tang、Andrew G. Capacci、Andre White、Shengli Ma、Sonia Rodriguez、Bo Qu、Jolaine Savoie、Nitinchandra D. Patel、Xudong Wei、Nizar Haddad、Nelu Grinberg、Nathan K. Yee、Dhileepkumar Krishnamurthy、Chris H. Senanayake
DOI:10.1021/ol1000999
日期:2010.3.5
A series of structurally novel, operationally convenient, and efficient chiral 2-phosphino-2,3-dihydrobenzo[d][1,3]oxaphosphole ligands was developed. Applications of ligands 3a and 3b in rhodium-catalyzedasymmetrichydrogenation of α-(acylamino)acrylates and β-(acylamino)acrylates provided excellent enantioselectivities (up to >99% ee) and reactivities (up to 10 000 TON).
开发了一系列结构新颖,操作方便且有效的手性2-膦基-2,3-二氢苯并[ d ] [1,3]氧杂磷配体。配体3a和3b在铑催化的α-(酰基氨基)丙烯酸酯和β-(酰基氨基)丙烯酸酯的不对称氢化反应中的应用提供了极好的对映选择性(高达99%ee)和反应性(高达10000吨)。