Adaptative Biaryl Phosphite-Oxazole and Phosphite-Thiazole Ligands for Asymmetric Ir-Catalyzed Hydrogenation of Alkenes
作者:Javier Mazuela、Alexander Paptchikhine、Oscar Pàmies、Pher G. Andersson、Montserrat Diéguez
DOI:10.1002/chem.200903350
日期:2010.4.19
library of readily available phosphite–oxazole/thiazole ligands (L1 a–g–L7 a–g) was applied in the Ir‐catalyzed asymmetrichydrogenation of several largely unfunctionalized E‐ and Z‐trisubstituted and 1,1‐disubstituted terminal alkenes. The ability of the catalysts to transfer chiral information to the product could be tuned by choosing suitable ligand components (bridge length, the substituents in the
一个易得的亚磷酸酯-恶唑/噻唑配体库(L1 a – g – L7 a – g)被用于Ir催化的几个未官能化的E和Z的不对称加氢反应中-三取代和1,1-二取代的末端烯烃。可以通过选择合适的配体组分(桥长,杂环和烷基主链上的取代基,配体主链的构型以及烯丙基中的取代基/构型)来调节催化剂将手性信息传递给产物的能力。亚磷酸亚芳基酯部分),因此可以根据需要使每种底物的对映选择性最大化。因此,对于多种E-和Z-三取代和1,1-二取代的末端烯烃,对映选择性极好(对映体过量(ee)值> 99%)。就底物的多功能性而言,亚磷酸亚芳基酯部分是非常有利的配体组分。
Pyrrolidine‐Based P,O Ligands from Carbohydrates: Easily Accessible and Modular Ligands for the Ir‐Catalyzed Asymmetric Hydrogenation of Minimally Functionalized Olefins
作者:Pilar Elías‐Rodríguez、Carlota Borràs、Ana T. Carmona、Jorge Faiges、Inmaculada Robina、Oscar Pàmies、Montserrat Diéguez
DOI:10.1002/cctc.201801485
日期:2018.12.7
The potential of P,O‐iminosugar based ligands in the Ir‐catalyzed asymmetric hydrogenation of minimallyfunctionalizedolefins is presented. These new ligands were prepared from easily available carbohydrates (D‐mannose, D‐ribose and D‐arabinose). The stereochemical and polyfunctional diversity of carbohydrates allowed the modulation of the ligands, both from their electronic properties and the rigidity
Synthesis of chiral 1,3-bis(1-(diarylphosphoryl)ethyl)-benzenes via Ir-catalyzed double asymmetric hydrogenation of bis(diarylvinylphosphine oxides)
作者:Xu Liu、ZhaoBin Han、Zheng Wang、KuiLing Ding
DOI:10.1007/s11426-014-5134-7
日期:2014.8
A class of chiral 1,3-bis(diarylphosphinoethyl)benzenes, which are key intermediates for the synthesis of PCP-type chiral pincer ligands, were prepared in high diastereomeric ratios and excellent ee values via double asymmetric hydrogenation of the corresponding bis(diarylvinylphosphine oxide) substrates using a SpinPhox/Ir(I) complex as the catalyst. The hydrogenation product 5a was readily transformed
Chiral ligands of the formula I or II,
may be obtained in high enantiomeric purity from compounds of the formulae III or IV, respectively,
with suitable phosphines, where the symbols R1, R, n, R3, R4, R' are as described in claim 1. The products may be converted into transition metal complexes which are useful as catalysts for asymmetric hydrogenation reactions.