[EN] METHOD FOR INCREASING THE ENANTIOMERIC EXCESS OF CHIRAL PHOSPHINE OXIDES, SULPHIDES, IMIDES AND BORANES<br/>[FR] PROCÉDÉ POUR AUGMENTER L'EXCÈS ÉNANTIOMÉRIQUE DES OXYDES, DES SULFURES, ET DES IMIDES DE PHOSPHINE AINSI QUE DES PHOSPHINE-BORANES CHIRAUX
申请人:CELTIC CATALYSTS LTD
公开号:WO2010004278A1
公开(公告)日:2010-01-14
The present invention relates to a method for increasing the enantiomeric excess of a chiral phosphine oxide, a chiral phosphine sulphide, a chiral phosphine-borane and a chiral phosphine imide said method comprising the steps of: (a) contacting said chiral phosphine oxide, sulphide, imide or borane with a solvent to form a slurry; (b) partitioning the phosphine oxide, sulphide, imide or borane either into the solvent or as an insoluble product; and (c) optionally, isolating the partitioned phosphine oxide, sulphide, imide or borane.
Enantiodivergent Formation of C–P Bonds: Synthesis of P-Chiral Phosphines and Methylphosphonate Oligonucleotides
作者:Dongmin Xu、Nazaret Rivas-Bascón、Natalia M. Padial、Kyle W. Knouse、Bin Zheng、Julien C. Vantourout、Michael A. Schmidt、Martin D. Eastgate、Phil S. Baran
DOI:10.1021/jacs.9b13898
日期:2020.3.25
Phosphorous Incorporation (PI, abbreviated Π) reagents for the modular, scalable, and stereospecific synthesis of chiral phosphines and methyl-phosphonate nucleotides are reported. Synthesized from trans-limonene oxide, this reagent class displays an unexpected reactivity profile and enables access to chemical space distinct from that of the Phosphorous-Sulfur Incorporation reagents previously disclosed
A U-Turn in the Asymmetric Appel Reaction: Stereospecific Reduction of Diastereomerically Enriched Alkoxyphosphonium Salts Allows the Asymmetric Synthesis of P-Stereogenic Phosphanes and Phosphane Boranes
作者:Kamalraj V. Rajendran、Jaya S. Kudavalli、Katherine S. Dunne、Declan G. Gilheany
DOI:10.1002/ejoc.201200285
日期:2012.5
recovered unchanged. The simple and efficient protocol significantly expands the scope of our asymmetric Appel process. The crucial step in the preparation involves stereospecificreduction of intermediate diastereomeric alkoxyphosphonium salts, which are obtained in the reaction of phosphane, hexachloroacetone, and menthol. Thereby, reaction with LiAlH4 or NaBH4 gives the corresponding phosphanes or phosphane
(+)-ephedrine, when changing the order of addition of the organolithium reagents during the synthetic pathway. The second approach is based on the chlorophosphine boranes, which react with an organolithium reagent, to afford the corresponding phosphines with inversion of configuration. In the case where the chlorophosphine borane reacts with the t-butyl lithium reagent, a metal-halogen exchange occurs to
Reduction of tertiary phosphine oxides to phosphine-boranes using Ti(Oi-Pr)4/BH3-THF
作者:Sylwia Sowa、K. Michał Pietrusiewicz
DOI:10.1016/j.tet.2021.132057
日期:2021.4
A new method for reduction of tertiaryphosphine oxides leading to the formation of tertiary phosphine-boranes has been developed. The BH3-THF/Ti(Oi-Pr)4 reducing system enables conversion of triaryl, diarylalkyl and trialkylphosphine oxides directly to their borane analogues in good to high yields. In contrast to the previously reported protocols, the presence of activating groups in the structure
已经开发出一种用于还原叔膦氧化物的新方法,该方法导致形成叔膦硼烷。BH 3 -THF / Ti(O i -Pr)4还原系统能够将三芳基氧化物,二芳基烷基氧化物和三烷基膦氧化物直接转化为它们的硼烷类似物,并且产率高至高。与先前报道的方案相反,起始材料的结构中活化基团的存在对于反应的发生不是必需的。该反应是高度立体选择性的,并且主要保留在磷原子处的构型。已经提出了通过BH 3 -THF / Ti(O i -Pr)4还原P O键的合理机理。