On Ni Catalysts for Catalytic, Asymmetric Ni/Cr-Mediated Coupling Reactions
摘要:
The importance of the Ni catalyst in achieving catalytic asymmetric Ni/Cr-mediated coupling reactions effectively is demonstrated. Six phenanthroline-NiCl2 complexes 1a-c and 2a-c and five types of alkenyl iodides A-E were chosen for the study, thereby demonstrating that these Ni catalysts display a wide range of overall reactivity profiles in terms of the degree of asymmetric induction, geometrical isomerization, and coupling rate. For three types of alkenyl iodides A-C, a satisfactory Ni catalyst(s) was found within 1a-c and 2a-c. For disubstituted (Z)-alkenyl iodide D, 2c was identified as an acceptable Ni catalyst: in terms of the absence of Z --> E isomerization and the degree of asymmetric induction but not in terms of the coupling rate. Two phosphine-based Ni catalysts, [(Me)(3)P](2)center dot NiCl2 and [(cy)(3)P](2)center dot NiCl2, were found to meet all three criteria for D. The bond-forming reaction at the C16-C17 position of palytoxin was used to demonstrate the usefulness of the Ni catalysts thus identified.
[EN] BORONIC ACID DERIVATIVES AND SYNTHESIS, POLYMORPHIC FORMS, AND THERAPEUTIC USES THEREOF<br/>[FR] DÉRIVÉS D'ACIDE BORONIQUE ET SYNTHÈSE, FORMES POLYMORPHES ET UTILISATIONS THÉRAPEUTIQUES ASSOCIÉES
申请人:QPEX BIOPHARMA INC
公开号:WO2021226114A1
公开(公告)日:2021-11-11
Disclosed herein are antimicrobial compounds, polymorphic forms, compositions, pharmaceutical compositions, the method of use and preparation thereof. Some embodiments relate to boronic acid derivatives and their use as therapeutic agents, for example, β-lactamase inhibitors (BLIs).
Palladium complex catalysed synthesis of sulfinic acids, sulfinic acid esters, sulfonic acids and S-alkyl alkanethiosulfonates
作者:Jürgen Herwig、Wilhelm Keim
DOI:10.1016/0020-1693(94)03911-9
日期:1994.7
Abstract A novel reaction for the synthesis of sulfinicacids, sulfinicacidsesters, sulfonicacids and S -alkyl alkanethiosulfonates from olefins, SO 2 and hydrogen will be described. Due to its similarity to hydroformylation, this reaction will be called hydrosulfination. Various palladiumcomplexes ([Pd(NCCH 3 ) 2 (R 2 P(CH 2 ) n PR 2 )](BF 4 ) 2 (RPh, n =2–5; RMe, o -(C 6 H 4 OMe), n =3) have
[EN] BORONIC ACID DERIVATIVES AND SYNTHESIS THEREOF<br/>[FR] DÉRIVÉS D'ACIDE BORONIQUE ET SYNTHESE DE CES DERNIERS
申请人:QPEX BIOPHARMA INC
公开号:WO2019075084A1
公开(公告)日:2019-04-18
Disclosed herein are antimicrobial compounds compositions, pharmaceutical compositions, the method of use and preparation thereof. Some embodiments relate to boronic acid derivatives and their use as therapeutic agents, for example, β-lactamase inhibitors (BLIs).
METHOD FOR THE HOMOGENEOUS CATALYTIC REDUCTIVE AMINATION OF CARBONYL COMPOUNDS
申请人:BASF SE
公开号:US20180186725A1
公开(公告)日:2018-07-05
The present invention relates to a method for the reductive amination of a carbonyl compound, comprising one or more carbonyl groups amenable to reductive amination, forming the corresponding primary amine, characterized in that the reaction is carried out in the presence of a homogeneously dissolved catalyst complex K, comprising at least one metal atom from Group 8, 9 or 10 of the periodic table, bearing a bidentate phosphane ligand, a carbonyl ligand, a neutral ligand and a hydride ligand, and also an acid as co-catalyst.
NMR Spectroscopic Studies of Palladium(II) Complexes of Bidentate Diphenylphosphane Ligands with Acetate and Tosylate Anions: Complex Formation and Structures
作者:Tiddo J. Mooibroek、Elisabeth Bouwman、Martin Lutz、Anthony L. Spek、Eite Drent
DOI:10.1002/ejic.200900974
日期:2010.1
synthetic pathways towards Pd-II complexes of functionalized bidentatediphenylphosphaneligands of the type [Pd(ligand)(anion)(2)] and [Pd(ligand)(2)](anion)(2) have been investigated. Eighteen different ligands have been used in combination with strongly (acetate, OAc-) or weakly (tosylate, OTs-) coordinating anions, The solid-state structure of some representative complexes was determined with X-ray crystallography
已经研究了 [Pd(ligand)(anion)(2)] 和 [Pd(ligand)(2)](anion)(2) 类型的功能化双齿二苯基膦配体的 Pd-II 配合物的合成途径。十八种不同的配体已与强(乙酸盐,OAc-)或弱(甲苯磺酸盐,OTs-)配位阴离子组合使用。一些代表性配合物的固态结构用 X 射线晶体学确定。表明固态结构完全保留在溶液中,通过H-1-和P-31-NMR光谱详细研究了[Pd(配体)-(阴离子)(2)]型配合物的形成. 根据配体结构,复合物通过多核中间体立即形成或根本不形成。