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
Six-membered bis(azaphosphorinane), readily available ligand for highly enantioselective asymmetric hydrogenations
作者:Yongjun Yan、Xumu Zhang
DOI:10.1016/j.tetlet.2006.01.003
日期:2006.3
A new six-membered bis(azaphosphorinane) ligand has been readily prepared starting from an inexpensive chiral epoxide; excellent enantioselectivities (up to over 99% ee) have been achieved in the Rh-catalyzed asymmetric hydrogenations of β-dehydroamino acid derivatives and α-arylenamides.
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)。
Highly Efficient Asymmetric Synthesis of β-Amino Acid Derivatives via Rhodium-Catalyzed Hydrogenation of β-(Acylamino)acrylates