An efficient synthesis of quinazoline-2,4-dione derivatives with the aid of a low-valent titanium reagent

New Analogues of Amides and Quinolinones Produced by Streptomyces sp. YIM S01983

Streptomide (1), a new amide analogue, streptomynone (2), a new quinolinone, and ten known compounds including three aliphatic acids (3-5), two amides (6-7), four cyclic dipeptides (8-11), and an adenosine (12) were isolated from the fermentation broth of Streptomyces sp. YIM S01983 isolated from a sediment sample collected in Bendong Village, Huadong Town, Chuxiong, China. Their structures were determined by analysis of the 1D/2D-NMR and HR-ESI-MS spectra. Compound 12 presented weak antimicrobial activities against Candida albicans and Aligenes faecalis (MIC=64 μg/mL). Compounds 7 and 12 showed weak cytotoxic activity against MHCC97H.

I2/TBHP mediated domino synthesis of 2-(2,4-dioxo-1,4-dihydroquinazolin-3(2H)-yl)-N-aryl/alkyl benzamides and evaluation of their anticancer and docking studies

A novel I2/TBHP mediated domino synthesis of 2-(2,4-dioxo-1,4-dihydroquinazolin-3(2H)-yl)-N-phenyl benzamides by reaction of isatins with o-amino N-aryl/alkyl benzamides was described. This was the first application of o-amino N-aryl/alkyl benzamides participating in oxidative rearrangement with isatins for synthesis of desired products. The synthesized compounds contained amide and quinazoline units and their combination resulted in molecular hybridization of two important pharmacophores. In this study, the synthesized compounds 3a-r were screened for cytotoxicity against four cancer cell lines A549, DU145, B16-F10, and HepG2 and also non-cancerous cell line CHO-K1. The compounds 3c, 3l and 3o gave promising results. The in silico molecular docking studies (PDB ID 1N37) also validated the anticancer activity of these compounds showing good binding affinity with target DNA and by acting as DNA intercalators.

DBU coupled ionic liquid-catalyzed efficient synthesis of quinazolinones from CO2 and 2-aminobenzonitriles under mild conditions

Efficient and green strategy for the chemical conversion and fixation of CO₂ is an attractive topic.

A mechanistic study on guanidine-catalyzed chemical fixation of CO2 with 2-aminobenzonitrile to quinazoline-2,4(1H,3H)-dione

Both basicity of TMG and acidity of the [TMGH]⁺ guanidinium are crucial for a reaction.

Efficient synthesis of quinazoline-2,4(1H,3H)-diones from CO2 catalyzed by N-heterocyclic carbene at atmospheric pressure

Under atmospheric pressure, quinazoline-2,4(1H,3H)-diones were obtained from the reaction of 2-aminobenzonitriles with carbon dioxide (0.1 MPa) with a catalytic amount of N-heterocyclic carbene in DMSO.

Amino-functionalized carbon nanofibres as an efficient metal free catalyst for the synthesis of quinazoline-2,4(1H,3H)-diones from CO2and 2-aminobenzonitriles

Carbon nanofibres functionalized with pyridyl moieties were used as an efficient metal free catalyst for the synthesis of quinazoline-2,4(1H,3H)-diones from CO₂and 2-aminobenzonitriles.

Amine functionalized MCM-41: an efficient heterogeneous recyclable catalyst for the synthesis of quinazoline-2,4(1H,3H)-diones from carbon dioxide and 2-aminobenzonitriles in water

Covalently linked amine functionalized MCM-41 was investigated as an efficient catalyst for the synthesis of various quinazoline-2,4(1H,3H)-dione derivatives from 2-aminobenzonitriles and carbon dioxide in water.

One pot synthesis of cis-bispyrimidodiazepinone derivatives via low-valent titanium reagent (TiCl4/Sm)

An efficient and convenient method for the preparation of cis-bispyrimidodiazepinone derivatives has been described. A variety of substrates can participate in the process with good yields, making this methodology suitable for library synthesis in drug discovery efforts. The mechanistic course of the reaction suggests the involvement of reduction, coupling which determine the products' configuration and cyclization by one-pot.

1,3-Dibenzyl-1,2,3,4-tetra-hydro-quinazoline-2,4-dione

The asymmetric unit of the title compound, C₂₂H₁₈N₂O₂, contains two independent mol­ecules, which differ in the orientations of the benzyl groups with respect to the planar (r.m.s. deviations of 0.031 and 0.020 Å) quinazoline-2,4-dione skeletons [dihedral angles of 73.97 (4) and 70.07 (4)° in the first mol­ecule and 75.63 (4) and 63.52 (3)° in the second]. The crystal structure is stabilized by weak inter­molecular C—H⋯O and C—H⋯π interactions and aromatic π–π stacking inter­actions [centroid–centroid distance = 3.735 (2) Å].

One-pot synthesis of quinazolinone derivatives from nitro-compounds with the aid of low-valent titanium

The synthesis of a series of quinazolinone derivatives such as 2-thioxoquinazolinones, imidazo[1,2-c]quinazolin-5-amines, and benzimidazo[1,2-c]quinazolin-5-amines, starting from nitro-compounds has been described. This general approach features a easy way for access to the target quinazolinone derivatives. The key cyclization step embraces the formation of a thiourea intermediate, mediated by low-valent titanium, and the other important intermediate was also obtained. A variety of substrates can participate in the process with good yields, making this methodology suitable for library synthesis in drug discovery efforts.