Enantioselective Synthesis of α-Phosphono Sulfonate Squalene Synthase Inhibitors: Chiral Recognition in the Interactions of an α-Phosphono Sulfonate Inhibitor with Squalene Synthase
Chiral Phosphoramide-Catalyzed Enantioselective Addition of Allylic Trichlorosilanes to Aldehydes. Preparative Studies with Bidentate Phosphorus-Based Amides
作者:Scott E. Denmark、Jiping Fu、Michael J. Lawler
DOI:10.1021/jo052203h
日期:2006.2.1
that more than one Lewis basic moiety (phosphoramide) is involved in the rate- and stereochemistry-determining step of enantioselectiveallylation, bidentate chiral phosphoramides were developed. Different chiral phosphoramide moieties were connected by tethers of methylene chains of varying length. The rate and enantioselectivity of allylation with allyltrichlorosilane promoted by the bidentate phosphoramides
Chiral phosphinamides: new catalysts for the asymmetric reduction of ketones by borane
作者:Barry Burns、N. Paul King、Heather Tye、John R. Studley、Mark Gamble、Martin Wills
DOI:10.1039/a709174e
日期:——
We have identified a new class of catalysts for the asymmetricreduction of prochiral ketones by borane. Key to the architecture of effective catalysts is an N–PO structural unit which may be part of a phosphinamide, phosphonamide or a related structure. Such catalysts are simple to prepare, are often crystalline solids and may be recovered from reduction reactions and reused. The catalysts act essentially
A new reagent for a very simple and efficient determination of enantiomeric purity of alcohols by 31P NMR
作者:Alexandre Alexakis、Stephane Mutti、Jean F. Normant、Pierre Mangeney
DOI:10.1016/s0957-4166(00)86347-8
日期:1990.1
A new reagent is described for the determination of enantiomeric excess of chiral alcohols. This derivatizing agent allows an accurate analysis by 31P NMR. A large array of primary, secondary, and tertiary alcohols, functionalized or not, were successfully tested. Reagent 7 is easy to prepare and reacts alone with the chiral alcohol, at room temperature, eventually directly in the NMR tube.
描述了一种用于测定手性醇对映体过量的新试剂。该衍生剂可以通过31 P NMR进行准确的分析。成功地测试了各种伯醇,仲醇和叔醇,无论它们是否官能化。试剂7易于制备,可与手性醇在室温下单独反应,最终直接在NMR管中进行反应。
Synthesis and Reactions of Chiral α-Lithiophosphoric Triamides
The synthesis of a novel chiral phosphoric triamide 2 is reported. Lithiated 2 undergoes regio- and diastereoselective addition reactions with various electrophiles.
报道了一种新型手性磷酸三胺2的合成。锂化的2与多种电亲核试剂发生区域选择性和二态选择性的加成反应。
Polystyrenes with chiral phosphoramide substituents as Lewis base catalysts for asymmetric addition of allyltrichlorosilane: enhancement of catalytic performance by polymer effect
作者:Toshiyuki Oyama、Hiroki Yoshioka、Masao Tomoi
DOI:10.1039/b417311b
日期:——
In the asymmetric addition of allyltrichlorosilane to benzaldehyde, polystyrenes with chiral phosphoramide substituents as Lewis base catalysts showed up to 2.4 times better catalytic activity and 1.4 times higher enantioselectivity than the corresponding low-molecular-weight analogues.