Functionalized Carbodiimide Mediated Synthesis of 2,3-Disubstituted Quinazolin-4(3H)-ones via the Tandem Strategy of C-Nucleophilic Addition and Intramolecular NH-Substitution Cyclization
作者:Takao Saito、Hayato Nakano、Noriki Kutsumura
DOI:10.1055/s-0032-1316773
日期:——
moiety at the proximal estergroup. A facile synthesis of quinazolin-4(3H)-ones possessing carbon substituents at positions 2 and 3 has been developed. Key to the synthesis is a tandem strategy involving introduction of a 2-substituent and construction of the quinazolinone framework via C-nucleophilic addition to the carbodiimide cumulenic carbon followed by intramolecular nucleophilic substitution by
Design, synthesis, and evaluation of new 4(
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)‐quinazolinone derivatives containing a pyrazole carboxamide moiety
作者:Xiang Wang、Xiaoyu Wang、Banghua Zhou、Jiefeng Long、Pei Li
DOI:10.1002/jhet.4334
日期:2021.11
well as antibacterial activities against Ralstonia solanacearum (R. solanacearum) and Xanthomomu oryzae pv. oryzae (Xoo) were assayed. Bioassay results revealed that the target compounds have certain antifungal and antibacterial activities. Especially, compound 5-chloro-1,3-dimethyl-N-(2-(4-oxo-2-(m-tolylamino)quinazolin-3(4H)-yl)ethyl)-1H-pyrazole-4-carboxamide (7g) exhibited better antibacterial activities
本研究共设计并合成了 15 种含有吡唑甲酰胺部分的新型 4(3 H )-喹唑啉酮衍生物。使用1 H NMR、13 C NMR、MS 和元素分析阐明了目标化合物的结构。然后,抗真菌活性对玉米赤霉( G. zeae )、尖孢镰刀菌( F. oxysporum )、Cytospora mandshurica ( C. mandshurica )、致病疫霉( P. infestans ) 和Pellicularia sasakii ( P. sasakii ) 具有抗菌活性反对Ralstonia solanacearum ( R. solanacearum ) 和Xanthomomu oryzae pv。对稻瘟病菌( Xoo ) 进行了测定。生物测定结果表明,目标化合物具有一定的抗真菌和抗菌活性。特别是,化合物5-氯-1,3-二甲基- ñ - (2-(4-氧代-2-(米-tolylamino)喹唑啉-3(4
Tetrabutylammonium Fluoride Promoted Intramolecular Nucleophilic Attack of an Ester Group on a Carbodiimide: Preparation of 1,3-Oxazolin-5-ones and 3,1-Benzoxazin-4-ones
作者:P. Molina、E. Aller、M. Écija、A. Lorenzo
DOI:10.1055/s-1996-4284
日期:1996.6
Functionalized carbodiimides bearing an ester group either at the α or β position undergo cyclization in the presence of tetrabutylammonium fluoride (TBAF) under mild conditions to give 1,3-oxazolin-5-ones or 3,1-benzoxazin-4-ones in synthetically useful yields.
SYNTHESIS AND FUNGICIDAL ACTIVITIES OF 2-BENZOTHIAZOLYLTHIO-SUBSTITUTED 4H-IMIDAZOL-4-ONES AND 4(3H)-QUINAZOLINONES
作者:Yang-Gen Hu、Shang-Jun Yang、Ming-Wu Ding
DOI:10.1080/10426500490466913
日期:2004.10.1
4H-Imidazol-4-ones 4 or 4(3H)-quinazolinones 8 were synthesized by base catalytic reactions of 2-mercaptobenzothiazole with carbodiimides 2 or 6, respectively, which were obtained via aza-Wittig reaction of iminophosphorane 1 or 5 with aromatic isocyanates. 4 and 8 exhibited fungicidal activity.