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
Characterization of new methyl-substituted tetralins and indans by13C NMR spectroscopy
作者:T. Laurens、F. Schmit-Quilès、D. Nicole
DOI:10.1002/mrc.1260330706
日期:1995.7
In order to perform the analysis of the components contained in fossil fuels, carbon assignments of new methylated derivatives of tetralin and indan were obtained. Their chemical shifts were calculated by applying additivity rules.
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Highly Stereoselective Hydrogenation of Unfunctionalized Tetrasubstituted Olefins
作者:Yun Dai、Xiangqing Feng、Haifeng Du
DOI:10.1021/acs.orglett.9b02512
日期:2019.9.6
A metal-free hydrogenation of unfunctionalized tetrasubstituted olefins were successfully realized using a combination of B(C6F5)3 and Ph2NMe catalyst. The corresponding products were afforded in 58-98% yields with up to >99:1 cis/trans selectivity.
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.