Contribution of ring strain and the stereoelectronic effect to the hydrolysis of cyclic five-membered ring phosphorus esters
作者:Ji-Charng Yang、David G. Gorenstein
DOI:10.1016/s0040-4020(01)89980-4
日期:1987.1
estimate of the magnitude of ring strain in these cyclicesters. In contrast, cyclicester hydrolyzes 1.5 × 106 times faster than its acyclic analog , corresponding to an activation free energy difference of 8.4 . This later energy difference is thought to be derived from both a ring strain effect (~ 5.2 ) and a stereoelectronic effect (~3.2 ).
Practical Synthesis of Chiral Vinylphosphine Oxides by Direct Nucleophilic Substitution. Stereodivergent Synthesis of Aminophosphine Ligands
作者:Marco Oliana、Frank King、Peter N. Horton、M. B. Hursthouse、King Kuok (Mimi) Hii
DOI:10.1021/jo052575q
日期:2006.3.1
A practical synthesis of opticallypure alkylphenylvinylphosphine oxides is described, utilizing a nucleophilic displacement at phosphorus to install the vinyl moiety. The products were used to prepare classes of P-stereogenic aminophosphine (PN) and aminohydroxyphosphine (PNO) ligands. Stereocontrol can be exerted at various stages of the synthesis, to provide specific combinations of chirality in
[reaction: see text] We describe a new, straightforward, and easy-to-handle method for achieving an unprecedented trimethylsilyl halide-catalyzed Michaelis-Arbuzov-like rearrangement. This rearrangement occurs at temperatures from room temperature to 80 degrees C and does not require addition of any alkyl halide. The scope and limitations of this new reaction are explored, as well as its mechanism
Design and Synthesis of Phosphinamide-Based Hydroxamic Acids as Inhibitors of Matrix Metalloproteinases
作者:Stanislaw Pikul、Kelly L. McDow Dunham、Neil G. Almstead、Biswanath De、Michael G. Natchus、Melanie V. Anastasio、Sara J. McPhail、Catherine E. Snider、Yetunde O. Taiwo、Longyin Chen、C. Michelle Dunaway、Fei Gu、Glen E. Mieling
DOI:10.1021/jm980142s
日期:1999.1.1
A new series of hydroxamic acid-based matrixmetalloproteinase (MMP) inhibitors containing a unique phosphinamide motif derived from D-amino acid was designed, synthesized, and tested for enzyme inhibition. Compounds with an R configuration at phosphorus were found to be potent MMP inhibitors while molecules with the S configuration were almost inactive. Structure-activity relationship studies of the
Scalable Enantiomeric Separation of Dialkyl-Arylphosphine Oxides Based on Host-Guest Complexation with TADDOL-Derivatives, and their Recovery
作者:Bence Varga、Réka Herbay、György Székely、Tamás Holczbauer、János Madarász、Béla Mátravölgyi、Elemér Fogassy、György Keglevich、Péter Bagi
DOI:10.1002/ejoc.202000035
日期:2020.3.31
enantioseparation of dialkyl‐arylphosphineoxides was elaborated, and five phosphine oxides were prepared with ee higher than 94 %. It was shown that these resolutions can be performed on gram scale, and can give both enantiomers of a phosphine oxide. It was demonstrated that organic solvent nanofiltration can serve as an alternative method of column chromatography for the recovery of the P‐oxide enantiomers and