Second-Generation Peptidomimetic Inhibitors of Protein Farnesyltransferase Demonstrating Improved Cellular Potency and Significant in Vivo Efficacy
摘要:
The synthesis and evaluation of analogues of previously reported farnesyltransferase inhibitors, pyridyl benzyl ether 3 and pyridylbenzylamine 4, are described. Substitution of 3 at the 5-position of the core aryl ring resulted in inhibitors of equal or less potency against the enzyme and decreased efficacy in a cellular assay against Ras processing by the enzyme. Substitution of 4 at the benzyl nitrogen yielded 26, which showed improved efficacy and potency and yet presented a poor pharmacokinetic profile. Further modification afforded 30, which demonstrated a dramatically improved pharmacokinetic profile. Compounds 26 and 29 demonstrated significant in vivo efficacy in nude mice inoculated with MiaPaCa-2, a human pancreatic tumorderived cell line.
Switchable imine and amine synthesis catalyzed by a tripodal ligand-supported well-defined cobaltcomplex is presented herein. A large variety of primary alcohols and amines were selectively converted to imines or amines in good to excellent yields. It is discovered that the base plays a crucial role on the selectivity. A catalytic amount of base leads to the imine formation, while an excess loading
Divergent Coupling of Alcohols and Amines Catalyzed by Isoelectronic Hydride Mn<sup>I</sup>and Fe<sup>II</sup>PNP Pincer Complexes
作者:Matthias Mastalir、Mathias Glatz、Nikolaus Gorgas、Berthold Stöger、Ernst Pittenauer、Günter Allmaier、Luis F. Veiros、Karl Kirchner
DOI:10.1002/chem.201603148
日期:2016.8.22
Herein, we describe an efficient coupling of alcohols and aminescatalyzed by well‐defined isoelectronic hydride MnI and FeII complexes, which are stabilized by a PNP ligand based on the 2,6‐diaminopyridine scaffold. This reaction is an environmentally benign process implementing inexpensive, earth‐abundant non‐precious metal catalysts, and is based on the acceptorless alcohol dehydrogenation concept
General, Green, and Scalable Synthesis of Imines from Alcohols and Amines by a Mild and Efficient Copper-Catalyzed Aerobic Oxidative Reaction in Open Air at Room Temperature
A general, green, and scalablesynthesis of the useful imines and α,β-unsaturated imines is successfully achieved by a low-loading and powerful, mild and efficientcopper-catalyzedaerobicoxidativereaction of alcohols and amines in the openair at roomtemperature under base- and dehydrating reagent-free conditions. This practical reaction can use air as the economic and green oxidant, tolerates
Switching the<i>N</i>-Alkylation of Arylamines with Benzyl Alcohols to Imine Formation Enables the One-Pot Synthesis of Enantioenriched α-<i>N</i>-Alkylaminophosphonates
作者:Natalie Hofmann、Kai C. Hultzsch
DOI:10.1002/ejoc.201900209
日期:2019.6.2
The base‐free N‐alkylation of anilines with benzylic alcohols can be switched in favor of imine formation simply by switching between a closed and an open reaction system. Further functionalization of the in situ synthesized imine leads to α‐N‐alkylaminophosphonates via a one‐pot procedure in an atom‐economic fashion.
作者:Merle Arrowsmith、Michael S. Hill、Gabriele Kociok-Köhn
DOI:10.1002/chem.201203190
日期:2013.2.18
The β‐diketiminato magnesium alkyl complex [LMgnBu] (L=CHCMe(NDipp)}2, Dipp=diisopropylphenyl) is shown to be a highly effective precatalyst for the hydroboration of alkyl and aryl substituted aldimines and ketimines with pinacol borane (HBpin). Catalysis is proposed to occur through a sequence of MgN/BH metathesis and rate‐determining MgH/NC insertion steps, a proposal strongly supported by stoichiometric
已显示β-二酮基亚氨基镁烷基络合物[LMg n Bu](L = CH CMe(NDipp)} 2,Dipp =二异丙基苯基)是高效的催化剂,用于频哪醇硼烷对烷基和芳基取代的亚胺和酮亚胺进行氢硼化(HBpin)。催化提出通过Mg的顺序发生 N / B ħ复分解和速度确定的Mg H /NC插入步骤,这一建议得到化学计量研究和动力学分析的大力支持。可以观察到反应是通过定义明确的酰胺酰胺进行的,其中有两个例子已被分离并进行了结构表征。机理研究表明,催化速率确定过程发生在一个孤立的镁中心,需要两个分子的亚胺底物才能有效转换。后者的观察结果被合理地认为是辅助底物分子将HBpin从催化镁中心的配位域置换出来的要求。