Enzymatic Synthesis of Enantiopure Precursors of Chiral Bidentate and Tridentate Phosphorus Catalysts
作者:Sylwia Kaczmarczyk、Małgorzata Kwiatkowska、Lidia Madalińska、Agnieszka Barbachowska、Michał Rachwalski、Jarosław Błaszczyk、Lesław Sieroń、Piotr Kiełbasiński
DOI:10.1002/adsc.201100280
日期:2011.9
The Candida antarctica lipase (CAL‐B)‐catalyzed acetylation of racemic 2‐hydroxymethylphenyl(methyl)phenylphosphine oxide, performed in diethyl ether, led to kinetic resolution with an unusually high enantioselectivity (E=3000). The CAL‐B‐mediated desymmetrization of prochiral bis(2‐hydroxymethylphenyl)methylphosphine oxide gave, via its enantioselective monoacetylation, the corresponding monoacetate
的南极假丝酵母脂肪酶(CAL-B)外消旋的2-羟甲基苯基(甲基)苯基氧化膦的催化的乙酰化,在二乙醚中进行的,导致了动力学拆分具有异常高对映选择性(Ë = 3000)。CAL-B介导的手性双(2-羟甲基苯基)甲基氧化膦的不对称化通过其对映选择性单乙酰化得到相应的单乙酸酯,收率80%,ee> 98%。后一种转化使我们能够在一个步骤中有效地将前手性底物转化为对映体纯产物。在这两种情况下,立构或立构磷原子与反应的羟基氧都通过四个键彼此隔开。所有产品的绝对构型均通过化学相关性和X射线分析确定。该产物将用作对映体纯底物,用于制备各种用于不对称合成的手性有机磷配体/催化剂。