The monodentate phosphoramidite MonoPhos has been used in the rhodium-catalysed asymmetrichydrogenation of N-acetyl-α-arylenamides. This ligand is readilyavailable via a one-step procedure and is air stable. Its Rh(I) complex, which is an effective catalyst precursor for the hydrogenation of dehydroamino acids, also gives high enantioselectivities for this class of substrates. Because of the facile
Catechol-Based Phosphoramidites: A New Class of Chiral Ligands for Rhodium-Catalyzed Asymmetric Hydrogenations
作者:Rob Hoen、Michel van den Berg、Heiko Bernsmann、Adriaan J. Minnaard、Johannes G. de Vries、Ben L. Feringa
DOI:10.1021/ol049726g
日期:2004.4.1
[reaction: see text] The synthesis and application of a new class of catechol-based phosphoramidites is described. Ees up to 99% were obtained in the rhodium-catalyzedasymmetrichydrogenation of dehydroamino acids and enamides.
of alkynes remains rather limited due to the high feasibility of the key metal-alkenyl intermediate to choose other reaction pathways. Herein, we report a NiH-catalyzed strategy for the hydroamidation of alkynes with dioxazolones, which allows convenient access to synthetically useful secondaryenamides in (E)-anti-Markovnikov or Markovnikov selectivity. The reaction is viable for both terminal and
PipPhos and MorfPhos: Privileged Monodentate Phosphoramidite Ligands for Rhodium-Catalyzed Asymmetric Hydrogenation
作者:Heiko Bernsmann、Michel van den Berg、Rob Hoen、Adriaan J. Minnaard、Gerlinde Mehler、Manfred T. Reetz、Johannes G. De Vries、Ben L. Feringa
DOI:10.1021/jo048374o
日期:2005.2.1
A library of 20 monodentate phosphoramidite ligands has been prepared and applied in rhodium-catalyzedasymmetrichydrogenation. This resulted in the identification of two ligands, PipPhos and MorfPhos, that afford excellent and in several cases unprecedented enantioselectivities in the hydrogenation of N-acyldehydroamino acid esters, dimethyl itaconate, acyclic N-acylenamides, and cyclic N-acylenamides
Pd(II)-Catalyzed Phosphorylation of Enamido C(sp<sup>2</sup>
)-H Bonds: A General Route to β-Amido-vinylphosphonates
作者:Baokun Qiao、Hao-Qiang Cao、Yin-Jun Huang、Yue Zhang、Jing Nie、Fa-Guang Zhang、Jun-An Ma
DOI:10.1002/cjoc.201800262
日期:2018.9
the synthesis of C–P bonds has been an important focus of research. We herein report a Pd‐catalyzed enamidoC(sp2)–Hphosphorylation for direct construction of C–P bonds under simple and convenient conditions without the need for additional ligands or directing groups. The present reaction can tolerate a wide range of functional groups, and furnish a variety of phosphorylation products including t