Unsymmetrical Iron P-NH-P′ Catalysts for the Asymmetric Pressure Hydrogenation of Aryl Ketones
作者:Samantha A. M. Smith、Paraskevi O. Lagaditis、Anne Lüpke、Alan J. Lough、Robert H. Morris
DOI:10.1002/chem.201701254
日期:2017.5.29
β‐aminophosphines is a new, versatile route to unsymmetrical tridentate (pincer) ligands P‐NH‐P′. Four new ligands PR2CH2CH2NHCHR′CHR′′PPh2 (R=iPr, Cy, R′=Ph, CH(CH3)2, R′′=Ph, H) prepared in this way are used to make the iron(II) complexes mer‐FeCl2(CO)(P‐NH‐P′) and mer‐FeCl(H)(CO)(P‐NH‐P′). The hydride complex with the rigid ligand with R′=R′′=Ph is an efficient and highlyenantioselective homogeneous asymmetric
Chiral phosphine ligand libraries based on the Bull–James three-component supramolecular assembly
作者:Hsin Y. Su、Daniel Gorelik、Mark S. Taylor
DOI:10.1080/10610278.2018.1564829
日期:2019.3.4
each component was observed. 11B NMR spectroscopy was used to evaluate the existence of B–N interactions in the free ligands as well as their Pd-derived complexes. A bidentate P,N-coordination mode was inferred for ligands that gave high enantioselectivity in the allylic substitution reaction. Abbreviation: BINOL: 1,1'-bi-2-naphthol; BSA: N,O-bis(trimethylsilyl)acetamide; DIOP: (2,3-O-isopropylidene-2
摘要描述了一种合成手性膦配体文库的方法,使用 2-甲酰基芳基硼酸、二醇或相关化合物和氨基膦的缩合。这种冷凝的三组分性质,以及构建块的现成可用性,能够快速生成不同的结构。从亚氨基硼酸酯衍生的膦库中,鉴定了在基准钯催化的烯丙基取代反应中产生 90% ee 或更高的三种配体。观察到作为每个组分结构函数的选择性的显着变化。11B NMR 光谱用于评估游离配体及其 Pd 衍生配合物中 B-N 相互作用的存在。双齿 P,对于在烯丙基取代反应中提供高对映选择性的配体,推断出 N 配位模式。缩写:BINOL:1,1'-bi-2-萘酚;BSA:N,O-双(三甲基甲硅烷基)乙酰胺;DIOP:(2,3-O-isopropidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane;HPLC:高效液相色谱;NMR:核磁共振;THF:四氢呋喃
Rhodium-P,O-bidentate coordinated ureaphosphine ligands for asymmetric hydrogenation reactions
作者:Jurjen Meeuwissen、Remko J. Detz、Albertus J. Sandee、Bas de Bruin、Joost N. H. Reek
DOI:10.1039/b926043a
日期:——
We present new ureaphosphine ligands that coordinate in a P,O-bidentate fashion to rhodium(I). The ureaphosphine-Rh(I)-complexes were effectively used in the asymmetric hydrogenation of cyclic enamides giving high conversions and enantioselectivity.
[EN] METHOD FOR PRODUCING AMIDINE DERIVATIVES<br/>[FR] PROCÉDÉ DE PRODUCTION DE DÉRIVÉS D'AMIDINE
申请人:BIOCRYST PHARM INC
公开号:WO2016029216A2
公开(公告)日:2016-02-25
The invention provides methods and intermediates useful in the synthesis of a compound of formula (I): or a pharmaceutically acceptable salt, solvate, ester or prodrug thereof; wherein the variables are as defined herein.
Protic aminophosphines with multiple chiral centers were synthesized in good yields and high purity by the nucleophilic ring-opening of N-protected cyclic sulfamidates with metal phosphides, followed by hydrolysis and deprotection. This synthetic approach is clean, scalable, and high yielding. The method provides an efficient alternative route for the synthesis of chiral aminophosphines.