Ti(O i Pr)4存在下格氏试剂对硫酰胺的还原烷基化作用是涉及20种不同底物的研究主题。评估了各种参数的影响,值得注意的是,在某些情况下,通过缓慢添加格氏试剂可以提高这种中等有效方法的收率。该贡献中提供的结果也为拟议的关键中间体(即金属化的亚胺基物种和最终的α-金属化的胺)的反应性提供了新的见识。有趣的是,通过控制温度和所结合的格氏试剂的量,该反应可以被导向选择性地形成前一个钛中间体配合物。这代表了原始方法的扩展,允许通过随后添加亲核试剂来合成各种先前难以接近的取代胺。这种作用不仅可以由有机镁化合物发挥作用,而且还可以由烷基锂试剂,烷基钛(IV)络合物和氢化锂铝发挥。还已经研究了α-金属胺最终中间体的性能,表明该络合物是一种不良的亲核试剂,但可以充当自由基前体,这在所得自由基种类稳定后尤其明显。总的来说,这种化学物质被证明是出乎意料的丰富,并且可以为将来开发新的应用奠定基础。证明该络合
Palladium-Catalyzed Hydrocarbonylative C–N Coupling of Alkenes with Amides
作者:Xibing Zhou、Guoying Zhang、Bao Gao、Hanmin Huang
DOI:10.1021/acs.orglett.8b00538
日期:2018.4.20
An efficient palladium-catalyzed hydrocarbonylative C–N coupling of alkenes with amides has been developed. The reaction was performed via hydrocarbonylation of alkenes, followed by acyl metathesis with amides. Both intermolecular and intramolecular reactions proceed smoothly to give either branched or linear amides in high turnover number (3500) with NH4Cl or NMP·HCl as a proton source under the palladium
Kulinkovich-type reactions of thioamides: similar to those of carboxylic amides?
作者:Ewelina Augustowska、Antoine Boiron、Jérôme Deffit、Yvan Six
DOI:10.1039/c2cc31394d
日期:——
The behaviour of thioamides under Kulinkovich-type conditions is compared with the known reactivity of carboxylic amides. Dramatic differences are disclosed.
Discovery and Development of 3-(6-Chloropyridine-3-yloxymethyl)-2-azabicyclo[3.1.0]hexane Hydrochloride (SUVN-911): A Novel, Potent, Selective, and Orally Active Neuronal Nicotinic Acetylcholine α4β2 Receptor Antagonist for the Treatment of Depression
guided by in vitro affinity at the α4β2 receptor in combination with selectivity against the α3β4 receptor, pharmacokinetic evaluation, and in vivo efficacy in a forced swim test resulted in identification of 3-(6-chloropyridine-3-yloxymethyl)-2-azabicyclo[3.1.0]hexane hydrochloride (9h, SUVN-911) as a clinical candidate. Compound 9h is a potent α4β2 receptor ligand with a Ki value of 1.5 nM. It showed
Synthesis of substituted γ- and δ-lactams based on titanocene(<scp>iii</scp>)-catalysed radical cyclisations of trichloroacetamides
作者:Faïza Diaba、Enrique Gómez-Bengoa、Juan M. Cuerva、Josep Bonjoch、José Justicia
DOI:10.1039/c6ra12180b
日期:——
A new procedure for the synthesis of γ- and δ-lactams based on a Cp2TiCl-catalysed cyclisation of trichloroacetamides under mild reaction conditions is reported. Theoretical studies supported the observed regioselectivity in the cyclisations and the mechanism involved in the dehalogenation process.
Ti-mediated intramolecular cyclopropanation of N-alkenyl thioamides: scope and mechanistic study
作者:Fabien Hermant、Emmanuel Nicolas、Yvan Six
DOI:10.1016/j.tet.2014.04.006
日期:2014.6
Although thioamides generally undergo a reductive alkylation process when they are treated with a Grignard reagent in the presence of Ti(OiPr)(4), substrates fitted with a but-3-enyl substitution at the nitrogen atom are shown to be converted into bicyclic aminocyclopropanes. These reactions are compared with the similar cyclisations of the corresponding carboxylic amide substrates. A mechanistic study is provided. Coincidently, new reagent systems are identified for the mediation of the same transformation. (C) 2014 Elsevier Ltd. All rights reserved.