rhodium-catalyzed asymmetric hydroboration of α-arylenamides with BI-DIME as the chiral ligand and (Bpin)2 as the reagent yields for the first time a series of α-amino tertiaryboronicesters in good yields and excellent enantioselectivities (up to 99% ee).
The N,N′-dioxide−Cu(OTf)2complexes were applied in the asymmetric amination reaction of N-acetyl enamides with dialkyl azodicarboxylate, giving the corresponding products in good yields with high enantioselectivities (up to 91% ee). Precursors of vicinal diamine were readily obtained with excellent diastereoselectivities (>95:5) by NaBH4 reduction.
Monodentate Phosphoramidites: A Breakthrough in Rhodium-Catalysed Asymmetric Hydrogenation of Olefins
作者:Michel van den Berg、Adriaan J. Minnaard、Robert M. Haak、Michel Leeman、Ebe P. Schudde、Auke Meetsma、Ben L. Feringa、André H. M. de Vries、C. Elizabeth P. Maljaars、Charlotte E. Willans、David Hyett、Jeroen A. F. Boogers、Hubertus J. W. Henderickx、Johannes G. de Vries
DOI:10.1002/adsc.200390026
日期:2003.1
ligands for the rhodium-catalysed asymmetrichydrogenation of olefins. Very high enantioselectivities were obtained with MonoPhos (7a) the simplest member of this class, a ligand that is prepared in a single step from BINOL and HMPT. Turnover numbers up to 6000 have been obtained in the hydrogenation of dehydroamino acid derivatives. Enantioselectivities in the hydrogenation of dehydroamino acids are solvent
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