合成了空气/水分稳定,晶体和可储存的手性水杨基恶唑啉基氧化(V)配合物,并公开了其在氢化硅烷作为氢化物源的情况下催化不对称还原酮亚胺的催化应用。获得了广泛的底物范围,高收率和出色的对映选择性(最高99%)。此外,对映体纯α-氨基酯,γ-和δ-内酰胺以及异吲哚啉酮的合成也已使用该方法进行。最后,该方法已应用于具有药物相关性的合成靶标,例如R -(+)-沙丁胺碱和R -(+)-crispine A.
N-Benzyl-l-prolinol: an efficient catalyst for the enantioselective addition of dialkylzinc reagents to N-(diphenylphosphinoyl)imines
作者:Raquel Almansa、David Guijarro、Miguel Yus
DOI:10.1016/j.tetasy.2007.03.026
日期:2007.4
Commercially available N-benzyl-l-prolinol has shown to be a very efficientcatalyst for the enantioselectiveaddition of dialkylzinc reagents to N-(diphenylphosphinoyl)imines. The use of 0.5 equiv of this β-aminoalcohol as a catalyst leads to the expected addition products in good yields and with ees up to 92% in a reaction time of only 4 h at room temperature. This ee is almost equal to the highest
Polymer-supported l-prolinol-based catalysts for the enantioselective addition of dialkylzinc reagents to N-(diphenylphosphinyl)imines
作者:Raquel Almansa、Juan F. Collados、David Guijarro、Miguel Yus
DOI:10.1016/j.tetasy.2012.12.007
日期:2013.2
Merrifield or Wang-type resins have been shown to form efficient catalysts for the enantioselective addition of dialkylzinc reagents to N-(diphenylphosphinyl)imines. The enantioselectivity achieved with the polymeric catalyst (ee up to 88%) is slightly lower than the one obtained with the homogeneous ligand N-benzyl-l-prolinol, but the polymer-supported ligand presents the advantage of its recyclability: it
General Method for the Expedient Synthesis of Salt-Free Diorganozinc Reagents Using Zinc Methoxide
作者:Alexandre Côté、André B. Charette
DOI:10.1021/ja710864p
日期:2008.3.1
Zn(OMe)2 with readily available Grignard reagents, it was possible to induce the complete precipitation of magnesium salts and then obtain salt-free diorganozinc reagents after centrifugation/filtration. This practical method to generate dialkylzincreagents as well as mixed diorganozinc reagents was successfully tested in various catalyticenantioselectivereactions, proving the purity of the product and
Asymmetric Synthesis of N-(Diphenylphosphinyl)amines Promoted by Chiral Carbosilane Dendritic Ligands in The Enantioselective Addition of Dialkylzinc Compounds to N-(Diphenylphosphinyl)imines
Asymmetric synthesis of N-diphenylphosphinoylamines by solvent-free enantioselective addition of dialkylzincs to N-diphenylphosphinoylimines
作者:Itaru Sato、Ryo Kodaka、Kenso Soai
DOI:10.1039/b106775n
日期:2001.11.15
Solvent-free enantioselective addition of dialkylzincs to N-diphenylphosphinoylimines in the presence of chiral 2-morpholino-1-phenylpropan-1-ol affords N-diphenylphosphinoylamines with up to 97% ee. The reaction in the solvent-free system is faster than in organic solvents.