Synthesis of Pyridyl-dihydrobenzooxaphosphole Ligands and Their Application in Asymmetric Hydrogenation of Unfunctionalized Alkenes
作者:Bo Qu、Lalith P. Samankumara、Jolaine Savoie、Daniel R. Fandrick、Nizar Haddad、Xudong Wei、Shengli Ma、Heewon Lee、Sonia Rodriguez、Carl A. Busacca、Nathan K. Yee、Jinhua J. Song、Chris H. Senanayake
DOI:10.1021/jo4024864
日期:2014.2.7
ligands were designed and synthesized by a diastereoselective SNAr substitution of the corresponding sulfonyl pyridines. The ligands were successfully applied in the Ir-catalyzed asymmetrichydrogenation of unfunctionalizedalkenes with good enantioselectivities.
提出了富电子的2-取代的6-(苯磺酰基)吡啶的合成。通过相应的磺酰基吡啶的非对映选择性的S N Ar取代,设计和合成了一系列空气稳定的,可调节的P-手性吡啶基-二氢苯并恶唑磷配体。该配体已成功应用于具有良好对映选择性的Ir催化未官能化烯烃的不对称氢化反应。
Extending the Substrate Scope in the Hydrogenation of Unfunctionalized Tetrasubstituted Olefins with Ir-P Stereogenic Aminophosphine–Oxazoline Catalysts
作者:Maria Biosca、Ernest Salomó、Pol de la Cruz-Sánchez、Antoni Riera、Xavier Verdaguer、Oscar Pàmies、Montserrat Diéguez
DOI:10.1021/acs.orglett.8b04084
日期:2019.2.1
MaxPHOX-type ligands have been successfully applied in the challenging asymmetrichydrogenation of tetrasubstitutedolefins under mild reaction conditions. Gratifyingly, these catalyst precursors are able to efficiently hydrogenate not only a range of indene derivatives (ee’s up to 96%) but also 1,2-dihydronapthalene derivatives and acyclic olefins (ee’s up to 99%), which both constitute the most challenging
Asymmetric Hydrogenation of Disubstituted, Trisubstituted, and Tetrasubstituted Minimally Functionalized Olefins and Cyclic β-Enamides with Easily Accessible Ir–P,Oxazoline Catalysts
We have developed a family of Ir–P,oxazoline catalysts for asymmetrichydrogenation. These catalysts, with a simple modular architecture, have shown a high tolerance to the olefin geometry and substitution pattern, and to the presence of several neighboring polar groups. Thus, they were able to successfully hydrogenate disubstituted, trisubstituted, and tetrasubstituted minimally functionalized olefins
Carbon-13 magnetic resonance of hydroaromatics. II. Conformation of Tetralin and tetrahydroanthracene and their methyl derivatives
作者:Frederick G. Morin、W. James Horton、David M. Grant、Don K. Dalling、Ronald J. Pugmire
DOI:10.1021/ja00350a042
日期:1983.6
Carbon-13 chemical shift data have been acquired for 36 methylated tetralins and tetrahydroanthracenes. A least-squares regression analysis has been undertaken on the ring carbons of compounds of unequivocal conformation to determine methyl substituent parameters for the two distinct aliphatic positions and the results have been used to estimate the position of equilibrium of conformationally mobile
Tuning the Peri Effect for Enantioselectivity: Asymmetric Hydrogenation of Unfunctionalized Olefins with the BIPI Ligands
作者:Carl A. Busacca、Bo Qu、Nicole Grět、Keith R. Fandrick、Anjan K. Saha、Maurice Marsini、Diana Reeves、Nizar Haddad、Magnus Eriksson、Jiang-Ping Wu、Nelu Grinberg、Heewon Lee、Zhibin Li、Bruce Lu、Dajun Chen、Yaping Hong、Shengli Ma、Chris H. Senanayake
DOI:10.1002/adsc.201201104
日期:2013.5.17
region. The development of ligands optimized for asymmetrichydrogenation of the challenging unfunctionalizedolefin substrate class is described. The naphthyl peri position, C‐8, has been identified as a critical stereocontrol element in the design of these ligands. Highly enantioselective ligands suitable for hydrogenation of tri‐ and tetrasubstitutedolefins are detailed.