22686-81-3

Upstream product

• 18543-22-1 2-benzoylaminobenzamide 
• 127082-54-6 2-Benzamido-N-methylbenzamide 
• 21737-87-1 N-methyl benzimidoyl chloride 
• 134-20-3 2-carbomethoxyaniline 
• 76893-90-8 (N-methyl)(phenyl)carbonitrilium trifluoromethylsulfonate 
• 28144-70-9 anthranilic acid amide 
• 100-46-9 benzylamine 
• 3400-29-1 N-methyl-2-nitrobenzamide 
• 16285-32-8 2,3-dihydro-3-methyl-2-phenylquinazolin-4(1H)-one 
• 593-51-1 methylamine hydrochloride 
• 7510-49-8 methyl 2-(benzamido)benzoate 
• 110809-98-8 2-Amino-benzoic acid N-methyl-N'-[1-phenyl-meth-(E)-ylidene]-hydrazide 
• 123-75-1 pyrrolidine 
• 118-48-9 isatoic anhydride 

Downstream Products

• 52458-01-2 4,4-di-naphthalen-1-yl-2-phenyl-4H-benzo[d][1,3]oxazine 
• 7031-95-0 1-benzoxy-2,2,6,6-tetramethylpiperidine 

Relevant academic research and scientific papers

Access to 2-Arylquinazolin-4(3H)-ones through Intramolecular Oxidative C(sp3)?H/N?H Cross-Coupling Mediated by I2/DMSO

A novel approach for the synthesis of 2-arylquinazolin-4(3H)-ones was developed. A series of title compounds were obtained with good functional group tolerance and good yields by I2/DMSO-mediated intramolecular oxidative cross-coupling of 2-(benzylamino)benzamides to form C=N double bonds. This method was applicable for gram-scale synthesis. A proposed reaction pathway based on some control experiments was also provided.

Direct synthesis of quinazolinones via the carbon-supported acid-catalyzed cascade reaction of isatoic anhydrides with amides and aldehydes

A novel catalytic system is reported for the construction of quinazolinones via the carbon-supported acid-catalyzed cascade coupling of isatoic anhydrides with amides and aldehydes. Subsequent selective hydrosilylation of the quinazolinones using a hydrogen-transfer strategy was also explored to provide dihydroquinazolines with structural diversity. The developed methodology proceeds with a broad substrate scope, excellent functional group tolerance, and utilizes a reusable catalyst and air as a green oxidant.

Metal-free catalyst for the visible-light-induced photocatalytic synthesis of quinazolinones

In the present work, we have developed a novel and environmentally friendly method for the synthesis of quinazolinones using fluorescein as a photocatalyst via a condensation reaction of o-aminobenzamides and aldehydes under visible light irradiation. In this protocol, neither toxic oxidants nor transition-metal catalysts were needed, and a series of quinazolinones could be obtained in high efficiencies. In addition, this reaction can be extended to gram levels and has a large potential of wide application in future industrialization.

Visible-light-mediated organoboron-catalysed metal-free dehydrogenation of N-heterocycles using molecular oxygen

The surge of photocatalytic transformation not only provides unprecedented synthetic methods, but also triggers the enthusiasm for more sustainable photocatalysts. On the other hand, oxygen is an ideal oxidant in terms of atom economy and environmental friendliness. However, the poor reactivity of oxygen at the ground state makes its utilization challenging. Herein, a visible-light-induced oxidative dehydrogenative process is disclosed, which uses an organoboron compound as the photocatalyst and molecular oxygen as the sole oxidant.Viathis approach, an array of N-heterocycles have been accessed under metal-free mild conditions, in good to excellent yields.

Method for preparing N - heterocyclic ring through visible light mediated dehydrogenation

The invention discloses a method for preparing N - heterocyclic rings through visible light mediated dehydrogenation, and the reaction can be carried out under the conditions of room temperature and visible light without heating. The novel tetra-coordination N-N - diaryl chelating borate compound serves as a photocatalyst, so that the use of a noble metal photocatalyst is avoided, precious metal residue in the reaction product can be reduced as much as possible, and the method is more suitable for synthesizing bioactive molecules.

Catalyst-free synthesis of quinazolinones by oxidative cyclization under visible light in the absence of additives

A general metal-free oxidative cyclization route was developed to synthesize quinazolinones under visible light. A series of substituted 2-aminobenzamides were reacted with aldehydes or ketones to produce the desired quinazolinones in good yields. Most importantly, the reaction did not require excess oxidant or high temperatures.

Method for photocatalytic synthesis of quinazolinone

The invention discloses a method for photocatalytic synthesis of quinazolinone. Anthranilamide and aldehyde are used as raw materials, fluorescein is used as a photocatalyst, p-toluene sulfonic acid is used as an auxiliary catalyst, and the quinazolinone is obtained through photocatalytic reaction under the irradiation of visible light. The non-metal catalyst is used, so that the reaction cost is reduced; the reaction conditions are mild, and the reaction can be completed at room temperature; and the method is simple to operate, short in reaction time, simple in post-treatment, high in product yield and more environment-friendly. The method not only has high academic value, but also has a certain industrialization prospect.

Direct Use of Benzylic Alcohols for Multicomponent Synthesis of 2-Aryl Quinazolinones Utilizing the π-Benzylpalladium(II) System in Water

We demonstrate the direct use of benzylic alcohols for a multicomponent reaction of readily available isatoic anhydrides with amines in water, which is a synthetic route for the direct construction of a series of 2-aryl quinazolinones. This one-pot synthetic method involves the dehydrative N-benzylation of in situ generated anthranilamides followed by an amide-directed benzylic C?H amination process utilizing the π-benzylPd(II) system. Comparison of independent rate measurements using benzyl alcohol and its deuterated form gave a kinetic isotope effect of 3.5. Therefore, the benzylic C?H bond is cleaved in the rate-determining step. We successfully carried out a gram-scale reaction in 85% yield with simplified product isolation. (Figure presented.).

Visible light induced tandem reactions: An efficient one pot strategy for constructing quinazolinones using in-situ formed aldehydes under photocatalyst-free and room-temperature conditions

A facile tandem route has been developed for constructing quinazolinones from various aminobenzamides and in-situ generated aldehydes. Visible light was found to play a dual role: first oxidizes the alcohol to the aldehyde and then facilitates its cyclization with o-substituted aniline. Furthermore, alcohols are perfect alternatives to aldehydes because they are greener, more available, more economical, more stable, and less toxic than aldehydes. The first reaction step continuously provides material for the second step, which effectively reduces loss through volatilization, oxidation, and polymerization of the aldehyde, while avoiding its toxicity. A variety of quinazolinones can be prepared in the presence of visible light without any additional photocatalyst. The developed synthesis protocol proceeds with the merits of mild conditions, broad substrate scope, operational simplicity, and high atom efficiency, with an eco-energy source under metal-free, photocatalyst-free, and ambient conditions.

An efficient transition-metal-free route to quinazolin-4(3H)-onesvia2-aminobenzamides and thiols

An efficient approach to quinazolin-4(3H)-ones was developed by a one-pot intermolecular annulation reaction ofo-amino benzamides and thiols. This method has the features of good functional group tolerance, being transition metal and external oxidant free, and easy operation. Varieties of 2-aryl (heteroaryl) quinazolin-4(3H)-one, 2-phenyl-pyrido[2,3-d]pyrimidin-4(3H)-one and 3-phenyl-2H-1,2,4-benzo thiadiazine-1,1-dioxide derivatives were obtained with a yield of up to 98%. The control experiment revealed that the thiol substrate could promote the dehydroaromatization step.