最近,类固醇CYP17抑制剂阿比特龙进入治疗雄激素依赖性前列腺癌的II期临床试验。由于17α-羟化酶-17,20-裂合酶(CYP17)催化雄激素生物合成的最后一步,对该靶标的抑制不仅会影响睾丸,还会影响肾上腺雄激素的形成。因此,CYP17抑制剂应优于现有疗法,例如使用GnRH类似物。然而,由于类固醇受体的亲和力,类固醇药物的副作用是已知的。因此,我们决定合成模拟天然CYP17底物孕烯醇酮和孕酮的非甾体化合物。报道了一系列15种新型和高活性非甾体CYP17抑制剂的合成和生物学评估。这些化合物是通过Suzuki交叉偶联制备的,用在大肠杆菌中表达的重组人CYP17检测了格氏反应和与咪唑的CDI辅助的S N t反应及其抑制活性。进一步测试了有前途的化合物对肝酶CYP3A4和糖皮质激素形成酶CYP11B1的选择性。事实证明所有化合物均为有效的CYP17抑制剂。活性最高的化合物7和8比酮康唑具有更高的活性,其活性可与阿比特龙媲美(IC
species. It was also applicable as a chemoselective hydrogenation catalyst, showing inactivity for the hydrogenolysis of tert‐butyldimethylsilyl (TBS) ethers, alkyl benzyl ethers, and benzyl alcohols. The tert‐amines on WA30 acted as moderate catalyst poisons for Pd, resulting in chemoselective hydrogenation. 7% Pd/WA30 was reused for at least five times without any loss of the hydrogenation catalytic
<i>N</i>-Heterocyclic Carbene Coordinated Heterogeneous Pd Nanoparticles as Catalysts for Suzuki–Miyaura Coupling
作者:Hyemin Min、Hiroyuki Miyamura、Shū Kobayashi
DOI:10.1246/cl.160369
日期:2016.7.5
Palladium nanoparticle (Pd NP) catalysts immobilized in a polymer with an N-heterocycliccarbene (NHC) moiety (PICB-NHC-Pd) have been developed, wherein the NHC moiety plays dual roles as a crosslinker and a ligand to activate the Pd NPs. The presence of both Pd NPs and NHC was confirmed by STEM/EDS and SR-MAS NMR analyses, respectively. This PICB-NHC-Pd catalyst showed excellent activity in the Suzuki–Miyaura
Dual-Metal <i>N</i>-Heterocyclic Carbene Complex (M = Au and Pd)-Functionalized UiO-67 MOF for Alkyne Hydration–Suzuki Coupling Tandem Reaction
作者:Ying Dong、Wen-Han Li、Yu-Bin Dong
DOI:10.1021/acs.joc.0c02641
日期:2021.1.15
Metal N-heterocyclic carbene complexes (NHC-M) have been recognized as an important class of organometallic catalysts. Herein, we demonstrate that different NHC-M (M = Au and Pd) species can be simultaneously introduced into a single metal organic framework (MOF) by direct assembly of NHC-M-decorated ligands and metal ions under solvothermal conditions. The obtained UiO-67-Au/Pd-NHBC MOF with different