Radical pathways of coal dissolution in hydrogen donor media. 2. .beta. Scission and 1,2 aryl migration reactions of radicals derived from methylindans and tetralin at 327-627.degree.C
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。
[EN] NOVEL CHIRAL NITROGEN-PHOSPHORUS LIGANDS AND THEIR USE FOR ASYMMETRIC HYDROGENATION OF ALKENES<br/>[FR] NOUVEAUX LIGANDS D'AZOTE-PHOSPHORE CHIRAUX ET LEUR UTILISATION POUR L'HYDROGÉNATION ASYMÉTRIQUE D'ALCÈNES
申请人:BOEHRINGER INGELHEIM INT
公开号:WO2015006458A1
公开(公告)日:2015-01-15
The invention relates to a series of novel chiral nitrogen-phosphorus ligands of formulae (Ia) and (Ib): wherein R1-R3 and X are as defined herein. The invention also relates to chiral metal complexes prepared with these chiral nitrogen-phosphorus ligands. The chiral metal complexes are useful as catalysts for carrying out asymmetric hydrogenation.
Hydrophosphination of Propargylic Alcohols and Amines with Phosphine Boranes
作者:Carl A. Busacca、Bo Qu、Elisa Farber、Nizar Haddad、Nicole Grět、Anjan K. Saha、Magnus C. Eriksson、Jiang-Ping Wu、Keith R. Fandrick、Steve Han、Nelu Grinberg、Shengli Ma、Heewon Lee、Zhibin Li、Michael Spinelli、Austin Gold、Guijun Wang、Peter Wipf、Chris H. Senanayake
DOI:10.1021/ol400309y
日期:2013.3.1
The first uncatalyzed hydrophosphinations of propargylic amines and alcohols with phosphine– borane complexes are described. The reactions proceed at ambient temperature or below without the use of protecting groups or the need to handle pyrophoric secondary phosphines, furnishing air-stable phosphineborane–amines and alcohols in good yields. Utilization of chiral propargylic substrates and unsymmetrical
Chiral (iminophosphoranyl)ferrocenes: highly efficient ligands for rhodium- and iridium-catalyzed enantioselective hydrogenation of unfunctionalized olefins
作者:Thanh Thien Co、Tae-Jeong Kim
DOI:10.1039/b607450b
日期:——
A series of chiral (iminophosphoranyl)ferrocenes (1-3) are highly efficient ligands for Rh- and Ir-catalyzed hydrogenation of a number of unfunctionalized olefins; almost perfect enantiomeric excesses (up to 99% ee) have been achieved under mild reaction conditions.
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