Development of a Phase-Transfer-Catalyzed, [2,3]-Wittig Rearrangement
摘要:
An investigation into the use of phase-transfer catalysis for the [2,3]-sigmatropic rearrangement of allyloxy carbonyl compounds is described. Initial studies focused on identifying viable substrate classes that would undergo selective [2,3]-rearrangement under phase-transfer catalysis. Under certain conditions, the [2,3]-sigmatropic rearrangement of allyloxy carbonyl compounds takes place in the presence of a phase-transfer agent, providing a rare example of a phase-transfer-catalyzed unimolecular reaction. In the course of this investigation, it was found that catalysis is dependent on several variables including base concentration, catalyst structure, and substrate lipophilicity. Preliminary testing of chiral, nonracemic phase-transfer catalysts has shown promising levels of enantioselectivity for future development.
Reductive Carbonylation of Aryl Halides Employing a Two-Chamber Reactor: A Protocol for the Synthesis of Aryl Aldehydes Including 13C- and D-Isotope Labeling
摘要:
A protocol has been developed for conducting the palladium-catalyzed reductive carbonylation of aryl iodides and bromides using 9-methylfluorene-9-carbonyl chloride (COgen) as a source of externally delivered carbon monoxide in a sealed two-chamber system (COware), and potassium formate as the in situ hydride source. The method is tolerant to a wide number Of functional groups positioned on the aromatic ring, and it can be exploited for the isotope labeling of the aldehyde group. Hence, reductive carbonylations run with (13)COgen provide a facile access to C-13-labeled aromatic aldehydes, whereas with DCO2K, the aldehyde is specifically labeled with deuterium. Two examples of double isotopic labeling are also demonstrated. Finally, the method was applied to the specific carbon-13 labeling of the beta-amyloid binding compound, florbetaben.
A pharmaceutical composition containing a compound of Formula (I) for treating an opioid receptor-associated condition. Also disclosed is a method for treating an opioid receptor-associated condition using such a compound. Further disclosed are two sets of thiazolidinone compounds of formula (I): (i) compounds each having an enantiomeric excess greater than 90% and (ii) compounds each being substituted with deuterium.
Provided herein are compounds of the formula (I):
as well as pharmaceutically acceptable salts thereof, wherein the substituents are as those disclosed in the specification. These compounds, and the pharmaceutical compositions containing them, are useful for the treatment of diseases such as, for example, obesity.
Synthesis and structure–activity relationships of new disubstituted phenyl-containing 3,4-diamino-3-cyclobutene-1,2-diones as CXCR2 receptor antagonists
作者:Gaifa Lai、J. Robert Merritt、Zhenmin He、Daming Feng、Jianhua Chao、Michael F. Czarniecki、Laura L. Rokosz、Tara M. Stauffer、Diane Rindgen、Arthur G. Taveras
DOI:10.1016/j.bmcl.2008.02.010
日期:2008.3
A series of 3,4- and 3,5-disubstituted phenyl-containing cyclobutenedione analogues were synthesized and evaluated as CXCR2 receptor antagonists. Variations in the disubstitution pattern of the phenyl ring afforded new compounds with potent CXCR2 binding affinity in the low nanomolar ranges. Moreover, two potent compounds 19 and 26 exhibited good oral pharmacokinetic profiles.
Regio- and Stereoselective Alkenylation of Allenoates with <i>gem</i>-Difluoroalkenes: Facile Access to Fluorinated 1,4-Enynes Bearing an All-Carbon Quaternary Center
作者:Qi-Qi Zhang、Shi-Yong Chen、E Lin、Honggen Wang、Qingjiang Li
DOI:10.1021/acs.orglett.9b00775
日期:2019.5.3
A regio- and stereoselective synthesis of fluorinated 1,4-enynes bearing an all-carbon quaternarycenter at the propargylic position is developed. The synthesis starts from readily available allenoates and gem-difluoroalkenes and proceeds via a key alkynylenolate intermediate following a nucleophilic addition/β-F elimination. This reaction occurs under mild reaction conditions with good tolerance to
Design, synthesis, and Structure–Activity Relationships (SAR) of 3-vinylindazole derivatives as new selective tropomyosin receptor kinases (Trk) inhibitors
by the US FDA approval of small molecular Trk inhibitors Larotrectinib (1, LOXO-101) and Entrectinib (2). However, gene mutation mediated resistance becomes a major challenge for Trk inhibitor therapies. Herein, we report the design, synthesis and Structure–ActivityRelationship investigation of a series of 3-vinylindazole derivatives as new Trk inhibitors with low nanomolar potencies. A representative
神经营养受体酪氨酸激酶(NTRK)融合是多种成年和小儿肿瘤的致癌驱动因子,已通过美国FDA批准的小分子Trk抑制剂Larotrectinib(1,LOXO-101)和ENTrectinib(2)验证。然而,基因突变介导的耐药性成为Trk抑制剂治疗的主要挑战。在本文中,我们报告了一系列3-乙烯基吲唑衍生物作为新型Trk抑制剂的设计,合成和结构-活性关系研究,该抑制剂具有低纳摩尔浓度。有代表性的化合物,7MB,结合与TrkA / B / C与ķ d 1.6,3.1和4.9纳米的值,并抑制它们的激酶功能与IC 50值分别为1.6、2.9和2.0 nM,但在KINOMEscan选择性研究中,对于大多数403种野生型激酶的大多数而言,其效价显然较低。该化合物还有效地抑制了BaF3细胞用NTRK融合与IC稳定转化的面板的增殖50在低nM范围内的值。此外,该化合物对具有NTRK1-G667C或NTRK3-G696A突变且IC