Highly effective asymmetrichydrogenation of β-ketophosphonates in the presence of Ru–(S)-SunPhos as catalyst was realized; good to excellent enantioselectivities (up to 99.9% ee) and excellent diastereoselectivities (96:4) were obtained.
Enantioselective synthesis of diisopropyl α-, β-, and γ-hydroxyarylalkylphosphonates from ketophosphonates: A study on the effect of the phosphonyl group
作者:Chris Meier、Wolfgang H.G. Laux
DOI:10.1016/0040-4020(95)00855-1
日期:1996.1
conditions to an enantioselective synthesis of diisopropyl α-, β- and γ-hydroxyphosphonates 4–6 by 1.3.2-oxazaborolidine catalysis using catecholborane 7 or BH3·Me2S 8 is described. The comparison to acetophenone reductions gave information's on the effect of the phosphonyl group during the reduction of ketophosphonate. So very efficient syntheses to chiral dialkyl α-, β- and γ-hydroxyphosphonates were
描述了使用儿茶酚硼烷7或BH 3 ·Me 2 S 8通过1.3.2-恶唑硼烷催化的不同还原条件与对映体选择性合成α-,β-和γ-羟基磷酸二异丙酯4-6的比较。与苯乙酮还原的比较给出了在酮膦酸酯还原过程中膦酰基的作用的信息。因此,精心设计了非常高效的手性二烷基α-,β-和γ-羟基膦酸酯的合成方法。
Candida rugosa lipase-catalyzed enantioselective hydrolysis in organic solvents. Convenient preparation of optically pure 2-hydroxy-2-arylethanephosphonates
作者:Yonghui Zhang、Zuyi Li、Chengye Yuan
DOI:10.1016/s0040-4039(02)00443-4
日期:2002.4
A convenient enzymatic method is presented for the preparation of optically pure 2-hydroxy-2-arylethanephosphonates. It is proved that 2-butyryloxy-2-arylethanephosphonates can be enantioselectively hydrolyzed in diisopropyl ether equilibrated with water to give both isomers in high yield and excellent enantiomeric excess.
Kinetic resolution of beta-hydroxyalkanephosphonates was efficiently performed by 2-fluorobenzoylation in the presence of copper(II) triflate and (R,R)-Ph-BOX as a catalyst with good s value of up to 21 (C) 2010 Elsevier Ltd. All rights reserved.
Asymmetric synthesis of chiral, nonracemic dialkyl-α-, β-, and γ-hydroxyalkylphosphonates via a catalyzed enantioselective catecholborane reduction
作者:Chris Meier、Wolfgang H.G. Laux
DOI:10.1016/0957-4166(95)00132-9
日期:1995.5
A highly enantioselective synthesis of dialkyl alpha-hydroxyphosphonates achieved by a oxazaborolidine catalyzed reduction with catecholborane starting with m-ketophosphonates is described. Both alpha-aryl- and alpha-alkylketophosphonates were reduced using the (S)-enantiomer of the catalyst 4 leading also to the (S)-configuration in the products 2. The reaction gave good chemical yields and excellent enantiomeric excesses (up to >99 % ee).