Mild Conditions for Pd-Catalyzed Carboamination of <i>N</i>-Protected Hex-4-enylamines and 1-, 3-, and 4-Substituted Pent-4-enylamines. Scope, Limitations, and Mechanism of Pyrrolidine Formation
作者:Myra Beaudoin Bertrand、Joshua D. Neukom、John P. Wolfe
DOI:10.1021/jo801631v
日期:2008.11.21
with aryl bromides leads to greatly increased tolerance of functional groups and alkene substitution. Substrates derived from (E)- or (Z)-hex-4-enylamines are stereospecifically converted to 2,1'-disubstituted pyrrolidine products that result from suprafacial addition of the nitrogen atom and the aryl group across the alkene. Transformations of 4-substituted pent-4-enylamine derivatives proceed in high
作者:Nicholas L. Reed、Grace A. Lutovsky、Tehshik P. Yoon
DOI:10.1021/jacs.1c02747
日期:2021.4.28
and exceptionally mild photocatalytic oxidative heterofunctionalization reactions between bulky tri- and tetrasubstituted alkenes and a wide variety of nucleophilic partners. Moreover, we demonstrate that the broad scope of this transformation arises from photocatalytic alkeneactivation and thus complements existing transition-metal-catalyzed methods for oxidative heterofunctionalization. More broadly
materials. Herein we disclose a catalyst‐ and reagent‐free formal aza‐Wacker type cyclization reaction for the synthesis of functionalized saturated N‐heterocycles. Key to the success is to conduct the reactions in a continuous‐flow electrochemical reactor without adding supporting electrolyte or additives. The reactions are characterized by broad tolerance of di‐, tri‐ and tetrasubstituted alkenes.
Intermolecular Anti-Markovnikov Hydroamination of Unactivated Alkenes with Sulfonamides Enabled by Proton-Coupled Electron Transfer
作者:Qilei Zhu、David E. Graff、Robert R. Knowles
DOI:10.1021/jacs.7b11144
日期:2018.1.17
Here we report a catalytic method for the intermolecularanti-Markovnikovhydroamination of unactivated alkenes using primary and secondary sulfonamides. These reactions occur at room temperature under visible light irradiation and are jointly catalyzed by an iridium(III) photocatalyst, a dialkyl phosphate base, and a thiol hydrogen atom donor. Reaction outcomes are consistent with the intermediacy
在这里,我们报告了一种使用初级和次级磺酰胺对未活化烯烃进行分子间抗马尔科夫尼科夫加氢胺化的催化方法。这些反应在室温下在可见光照射下发生,并由铱 (III) 光催化剂、磷酸二烷基酯碱和硫醇氢原子供体共同催化。反应结果与通过磺酰胺 NH 键的质子耦合电子转移激活产生的 N 中心磺酰胺自由基的中间体一致。概述了反应的合成范围(> 60 个例子)和机械特征的研究。
Diastereoselective Formation of Substituted Cyclic Non-Proteinogenic α-Amino Acids by Cyclization of Activated Imines
作者:Lutz F. Tietze、Matthias Bratz
DOI:10.1055/s-1989-27278
日期:——
The intramolecular cyclization of alkyl (5-methyl-4-hexenylimino)acetates 7 with trimethylsilyl triflate (TMS-OTf) in toluene or tert-butyl methyl ether affords the cis- and trans-3-isopropenyl-2-piperidinecarboxylates 8 and 9 in ratios from 1:15 to 1:33. TMS-OTf is superior to Lewis acids in this reaction. The imines 7 can be obtained by condensation of 5-methyl-4-hexenylamine 5 and alkyl glyoxylates. Saponification of the diastereomerically pure cyclization product 9 affords the non-proteinogenic α-amino acid 10 (3-isopropenyl-2-piperidinecarboxylic acid).