169797-22-2

Upstream product

• 16619-38-8 2'-nitro-chalcone 
• 577-59-3 2-acetylnitrobenzene 
• 53744-32-4 (2E)-1-(2-nitrophenyl)-3-phenyl-2-propen-1-one 
• 100-52-7 benzaldehyde 
• 551-93-9 2-aminoacetophenone 
• 100-51-6 benzyl alcohol 
• 615-43-0 2-iodophenylamine 
• 52670-38-9 2-ethynylaniline 
• 103529-16-4 2-[(trimethylsilyl)ethynyl]aniline 
• 78396-00-6 1-(2-aminophenyl)-3-phenylprop-2-en-1-one 

Downstream Products

• 612-96-4 2-Phenylquinoline 
• 24005-23-0 2-phenyl-1,2,3,4-tetrahydroquinoline 
• 16619-14-0 2-phenyl-2,3-dihydro-1H-quinolin-4-one 

Relevant academic research and scientific papers

A Novel Approach to N-Tf 2-Aryl-2,3-Dihydroquinolin- 4(1H)-ones via a Ligand-Free Pd(II)-Catalyzed Oxidative Aza-Michael Cyclization

2-Aryl-2,3-dihydroquinolin-4(1H)-ones have recently been identified as important structures with potent biological activities such as antitumor and antidiabetic effect. Herein, a total of 25 novel N-Tf 2-aryl-2,3-dihydroquinolin-4(1H)-ones were expediently synthesized via the oxidative aza-Michael cyclization of N-Tf-2′-aminodihydrochalcones by ligand-free palladium(II) catalysis. This study presents a new synthetic approach to yield N-Tf 2-aryl-2,3-dihydroquinolin-4(1H)-ones, which can be easily transformed into pharmacologically interesting aza-flavanones and other N-heterocycles, such as quinolines and tetrahydroquinolines, in yields up to 84 %. This methodology has various advantages, which includes short reaction times under mild conditions and suitable functional group tolerance. Furthermore, a plausible mechanism was proposed and demonstrated by kinetic analysis.

Copper-Catalyzed Chemoselective Cyclization Reaction of 2-Isocyanoacetophenone: Synthesis of 4-Hydroxyquinoline Compounds

A copper-catalyzed intramolecular cyclization reaction of 2-isocyanoacetophenone derivatives to afford 4-hydroxyquinolines chemoselectively is described. The transformation proceeds through enol tautomerism and a subsequent C-C bond formation. Compared to previous methods, this study provides a new protocol for the construction of 4-hydroxyquinoline compounds from functionalized isocyanides under mild conditions.

Chemoselective Alkylation of Aminoacetophenones with Alcohols by Using a Palladacycle-Phosphine Catalyst

The development of efficient and environmentally benign palladacycle-phosphine catalyzed process to enable the formation of chemoselective C-alkylated or N-alkylated aminoacetophenones with alcohols is described. This methodology proved to be tunable by variation of the base and the temperature, which allows for the isolation of structurally diverse C-alkylated and N-alkylated aminoacetophenones. Moreover, this methodology has been applied to the synthesis of biologically and industrially important donepezil.

Synthesis of 3-Substituted 2,1-Benzisoxazoles by the Oxidative Cyclization of 2-Aminoacylbenzenes with Oxone

An efficient approach to the synthesis of 2,1-benzisoxazoles through direct construction of the N-O bond by the chemoselective oxidation of 2-aminoacylbenzenes with Oxone is described. This alternative methodology is characterized by its simple and transition-metal-free conditions and good functional group compatibility utilizing Oxone as a green oxidant instead of hypervalent iodine compounds. Moreover, this new procedure simplifies the number of steps compared to the previously reported procedure by circumventing the use of 2-azido-substituted aryl ketones.

Process Intensification with Bifunctional Heterogeneous Catalysts: Selective One-Pot Synthesis of 2′-Aminochalcones

(Chemical Equation Presented) 2′-Aminochalcones of pharmaceutical and commercial interest have been obtained in high yields and selectivities through a one-pot process using a bifunctional heterogeneous catalyst bearing base and metal active sites. This is a physical mixture material formed by a high-surface-area MgO and Pt on TiO2. The process involves as the first step the Claisen-Schmidt condensation between o-nitroacetophenone and benzaldehyde derivatives on the basic catalytic function. This is followed by a chemoselective hydrogenation of the nitro group in the presence of the carbonyl and double-bond carbon-carbon groups within the molecule. Using the bifunctional catalyst and the reaction system proposed here, it is possible to produce, under mild reaction conditions and short reaction times, 2′-aminochalcones with higher yields and selectivities than those obtained by conventional multistep methods.

Iridium catalysed chemoselective alkylation of 2′-aminoacetophenone with primary benzyl type alcohols under microwave conditions

2′-Aminoacetophenone was chemoselectively alkylated with a range of substituted benzyl, heteroaryl alcohols to afford either the corresponding C- or N- alkylated products in good yield.

(±)-2-Aryl-2,3-dihydro-4(1H)-quinolinones by a tandem reduction-Michael addition reaction

An efficient synthesis of (±)-2-aryl-2,3-dihydro-4(1H)-quinolinones has been developed from chalcones prepared from 2′-nitroacetophenone and a series of substituted benzaldehydes. The cyclization sequence is initiated by reduction of the nitro group under dissolving metal conditions using iron powder in concentrated hydrochloric acid. Milder conditions, using acetic acid or acetic acid-phosphoric acid as the reaction medium, were less satisfactory. Procedural details as well as a mechanistic discussion and reaction optimization studies are presented.

1,3-disubstituted-2-carboxyl quinolones: Highly potent and selective endothelin A receptor antagonists

The design, synthesis, and in vitro biological activity of a series of 2-carboxy quinolone antagonists selective for the endothelin A receptor are presented. Introduction of a second acid group in position 3 of the quinolone ring increases dramatically the selectivity for ET(A). (C) 2000 Elsevier Science Ltd. All rights reserved.