Probing the Existence of a Metastable Binding Site at the β<sub>2</sub>-Adrenergic Receptor with Homobivalent Bitopic Ligands
作者:Birgit I. Gaiser、Mia Danielsen、Emil Marcher-Rørsted、Kira Røpke Jørgensen、Tomasz M. Wróbel、Mikael Frykman、Henrik Johansson、Hans Bräuner-Osborne、David E. Gloriam、Jesper Mosolff Mathiesen、Daniel Sejer Pedersen
DOI:10.1021/acs.jmedchem.9b00595
日期:2019.9.12
development of bitopicligands aimed at targeting the orthosteric binding site (OBS) and a metastable binding site (MBS) within the same receptor unit. Previous molecular dynamics studies on ligand binding to the β2-adrenergic receptor (β2AR) suggested that ligands pause at transient, less-conserved MBSs. We envisioned that MBSs can be regarded as allosteric binding sites and targeted by homobivalent bitopic
enantioselectivity in this reaction is attributed to the high performance of the unique Cu(I)-(R,RP)-TANIAPHOS complex in asymmetric induction. Finally, one monophosphine and two bisphosphines prepared by the present reaction are employed as efficient chiralligands to afford three structurally diversified Cu(I) complexes, which demonstrates the synthetic utility of the present methodology.
铜 (I) 催化的 HPAr 1 Ar 2与烷基卤化物的不对称烷基化被发现,它以通常高产率和对映选择性提供了一系列P-立体膦。亲电子卤代烷具有广泛的底物范围,包括烯丙基溴、炔丙基溴、苄基溴和烷基碘。此外,11 个不对称的二芳基膦 (HPAr 1 Ar 2 ) 可作为有能力的亲核试剂。该方法还成功地应用于催化不对称双烷基化和三烷基化,并以中等的非对映选择性和优异的对映选择性获得了相应的产物。一些31P NMR 实验表明,体积大的 HPPhMes 对 Cu(I)-双膦配合物的竞争配位能力较弱,因此化学计量的 HPAr 1 Ar 2 的存在不会显着影响对映选择性。因此,该反应的高对映选择性归因于独特的 Cu(I)-( R , R P )-TANIAPHOS 络合物在不对称诱导中的高性能。最后,通过本反应制备的一种单膦和两种双膦用作有效的手性配体,以提供三种结构多样化的 Cu(I) 配合物,这证明了本方法的合成效用。
Dynamic neighbouring participation of nitrogen lone pairs on the chromogenic behaviour of trans-bis(salicylaldiminato)Pt(<scp>ii</scp>) coordination platforms
The participation of neighbouring nitrogen lone pairs in the chromogenic control of trans-bis(salicylaldiminato)Pt(II) platforms was examined, using newly designed Pt analogues bearing salicylaldehyde hydrazone ligands. A series of non-vaulted and vaulted Pt complexes (1–5) with salicylaldehyde hydrazones as trans-coordinated bidentate ligands were synthesized and characterized with regard to the chromogenic
Synthese von α-Halogen-ω-alkylthio-alkanen und α,ω-Bisalkylthio-alkanen
作者:Elke Anklam
DOI:10.1055/s-1987-28097
日期:——
Synthesis of α-Halogeno-Ï-alkylthioalkanes and α,Ï-Bisalkylthioalkanes The reaction of α,Ï-dihalogenated alkanes [X(CH2)nX,,n = 3 - 10]with alkylthiolates affords α-halogeno-Ï-alkylthioalkanes 1 as well as α,Ï-bisalkylthioalkanes 2. Products 1 (40 examples) and 2 (22 examples) are easily isolated in good yields by flash chromatography.