KIO<sub>3</sub>-Catalyzed Aerobic Cross-Coupling Reactions of Enaminones and Thiophenols: Synthesis of Polyfunctionalized Alkenes by Metal-Free C–H Sulfenylation
The synthesis of polyfunctionalized aminothioalkenes has been realized via the direct C–H sulfenylation of enaminones and analogous enamines. These cross-coupling reactions have been achieved by simple KIO3 catalysis under aerobic conditions without employing any transition metal catalyst or additional oxidant. The employment of bio-basedgreensolventethyllactate as the reaction medium constitutes
Alternative formation of amides and β-enaminones from aroyl chlorides using the TiCl<sub>4</sub>-trialkylamine reagent system
作者:Antonella Leggio、Alessandra Comandè、Emilia Lucia Belsito、Marianna Greco、Lucia Lo Feudo、Angelo Liguori
DOI:10.1039/c8ob01536h
日期:——
The TiCl4/NR3 reagent system has been successfully employed for the synthesis of amides and β-enaminones. The reaction of variously substituted benzoyl chlorides with the TiCl4/NR3 reagent system, by using two different experimental procedures (Method A and Method B), afforded alternatively the corresponding amides and β-enaminones as unique or major products. The two developed protocols were investigated
TiCl 4 / NR 3试剂系统已成功用于酰胺和β-烯胺酮的合成。通过使用两种不同的实验程序(方法A和方法B),将各种取代的苯甲酰氯与TiCl 4 / NR 3试剂系统反应,可以交替提供相应的酰胺和β-烯酮,为独特或主要产物。用一系列叔胺研究了两种开发的方案。由TiCl 4的存在调节的反应提供了令人满意的收率的相应酰胺或β-烯酮。本文报道了一种通过芳酰氯与TiCl反应形成碳-碳键的新方法4 / NR 3试剂系统。
New Entry to a Three-Component Pyrimidine Synthesis by TMS−Ynones via Sonogashira Coupling
作者:Alexei S. Karpov、Thomas J. J. Müller
DOI:10.1021/ol035212q
日期:2003.9.1
synthesized in an atom-economical fashion by coupling (het)aroyl chlorides and (TMS)-acetylene with only one equiv (!) of triethylamine under Sonogashira conditions. This mild ynone synthesis is also a suitable entry to 2,4-disubstituted pyrimidines in the sense of a one-pot three-component reaction, i.e., a coupling-addition-cyclocondensation sequence.
Tunable and Diastereoselective Brønsted Acid Catalyzed Synthesis of β-Enaminones
作者:Ye-Won Kang、Yu Jin Cho、Seung Jin Han、Hye-Young Jang
DOI:10.1021/acs.orglett.5b03445
日期:2016.1.15
The Brønsted acid catalyzed Meyer–Schuster reaction of hemiaminals was studied for the stereoselective synthesis of β-enaminones. Hemiaminals were formed from propargyl aldehydes (or the oxidation of propargyl alcohols) and amines in the presence of Brønsted acids. A critical step to control the stereochemistry of the products is the protonation of the corresponding allenol intermediate, which is dictated
Straightforward Novel One-Pot Enaminone and Pyrimidine Syntheses by Coupling-Addition-Cyclocondensation Sequences
作者:Thomas J. Müller、Alexei S. Karpov
DOI:10.1055/s-2003-42480
日期:——
The coupling of acid chlorides 1 with terminal alkynes 2using only one equivalent (!) of triethylamine under Sonogashira conditions followed by subsequent addition of primary or secondary amines 4 to the intermediate alkynones 3 represents a straightforward one-pot three component access to enaminones 5 undermildconditions and in excellent yields. Furthermore, 2,4-di- and 2,4,6-trisubstituted pyrimidines