Chiral, Sterically Demanding N-Heterocyclic Carbenes Fused into a Heterobiaryl Skeleton: Design, Synthesis, and Structural Analysis
摘要:
A series of Cu(I), Ag(I), and Au(I) complexes incorporating a new family of imidazopyridin-3-ylidene ligands substituted by a diphenylpyrrolidino group at N(1) and aryl groups at C(5) has been synthesized and their structures determined by X-ray diffraction analysis. This structural study has revealed an extremely high steric protection of the metal center by the bulky heterobicyclic carbenes, while the inversion at the exocyclic N(sp(3)) atom provides a remarkable flexibility.
[EN] HETEROCYCLIC COMPOUND AND USE THEREOF<br/>[FR] COMPOSÉ HÉTÉROCYCLIQUE ET SON UTILISATION
申请人:TAKEDA PHARMACEUTICALS CO
公开号:WO2019027058A1
公开(公告)日:2019-02-07
The present invention provides a heterocyclic compound having an orexin type 2 receptor agonist activity. A compound represented by the formula (I) : wherein each symbol is as described in the specification, or a salt thereof, is useful as an agent for the prophylaxis treatment of narcolepsy.
Rhodium(I) Complexes with Ligands Based on N-Heterocyclic Carbene and Hemilabile Pyridine Donors as Highly <i>E</i> Stereoselective Alkyne Hydrosilylation Catalysts
作者:Judith P. Morales-Cerón、Patricia Lara、Joaquín López-Serrano、Laura L. Santos、Verónica Salazar、Eleuterio Álvarez、Andrés Suárez
DOI:10.1021/acs.organomet.7b00361
日期:2017.7.10
substitution at the 6-position of the pyridine donor serve as efficient E-selective alkyne hydrosilylation catalyst precursors. Particularly, when the steric hindrance of the picolyl fragment is increased, a catalyst precursor exhibiting high catalytic activities (TOF up to 500 h–1 at S/C ratios of 1000) and excellent E selectivities (E/α ratio ≥95/5) in the hydrosilylation of a series of aryl, alkyl, and
包含吡啶供体6-位取代度不同的吡啶甲基-NHC(NHC = N-杂环卡宾)配体的阳离子铑(I)络合物可作为有效的E选择性炔烃氢化硅烷化催化剂前体。特别是,当甲基吡啶基片段的空间位阻增加时,催化剂前体表现出高催化活性(S / C比为1000时,TOF高达500 h –1)和极好的E选择性(E在一系列芳基,烷基和官能化的末端炔烃与碳-和烷氧基硅烷的氢化硅烷化反应中,获得了/α比≥95/ 5)。Rh配合物中的吡啶甲基-NHC配体由于吡啶片段的半不稳定配位作用而在溶液中表现出动态行为。初步的机理研究支持了由Rh配合物和硅烷低浓度生成的Rh甲硅烷基氢化物参与炔烃的氢化硅烷化反应,并与Chalk–Harrod型机理的假设相一致。
Bulky Picolyl Substituted NHC Ligands and Their Pd
<sup>0</sup>
Complexes
作者:Stefan Warsink、Carien M. S. van Aubel、Jan J. Weigand、Shiuh‐Tzung Liu、Cornelis J. Elsevier
DOI:10.1002/ejic.201000768
日期:2010.12
Heterobidentate N-heterocyclic carbene-picolyl ligands with various substitution patterns and their palladium(0) complexes have been synthesized in excellent yields via their corresponding silver(I) complexes. These complexes are among the first examples where substitution next to the coordinating nitrogen is evaluated systematically. The complexes have been studied by NMR and X-ray diffraction, confirming