Facile access to <i>N</i>-formyl imide as an <i>N</i>-formylating agent for the direct synthesis of <i>N</i>-formamides, benzimidazoles and quinazolinones
N-Formamide synthesis using N-formyl imide with primary and secondary amines with catalytic amounts of p-toluenesulfonic acid monohydrate (TsOH·H2O) is described. This reaction is performed in water without the use of surfactants. Moreover, N-formyl imide is efficiently synthesized using acylamidines with TsOH·H2O in water. In addition, N-formyl imide was successfully used as a carbonyl source in the
Robust approach leading to novel densely functionalized four-cyclic benzo[e]pyrazolo[5′,1′:2,3]pyrimido[4,5-b][1,4]diazepines with antibacterial activity toward resistant strains
AbstractA straightforward approach for the regioselective synthesis of various derivatives of benzo[e]pyrazolo[5′,1′:2,3]pyrimido[4,5-b] [1, 4] diazepine as a novel heterocyclic systemfrom the annulation of 6-bromo-7-chloro-3-cyano-2-(ethylthio)-5-methylpyrazolo[1,5-a]pyrimidine with several 2-amino-N-substituted benzamides as bident nucleophiles in the presence of K2CO3 and DMF has been disclosed
摘要苯并[ e ]吡唑并[5',1':2,3]嘧啶并[4,5- b ] [1,4]二氮杂pine的区域选择性合成的直接方法在K 2 CO 3存在下,6-溴-7-氯-3-氰基-2-(乙硫基)-5-甲基吡唑并[1,5- a ]嘧啶与几种2-氨基-N-取代的苯甲酰胺作为双亲核试剂并且已经公开了DMF。正确的区域异构体也通过2 D-NOESY NMR光谱进行了阐明。尽管相对高浓度的多药耐药肺炎克雷伯菌和肺炎克雷伯菌,大多数新型合成化合物均显示出抗菌活性。大肠杆菌临床分离株具有很强的生物膜形成能力。作为最有效的化合物,N-环己基取代的吡唑并嘧啶基苯并二氮杂((3 小时)对两种细菌菌株均具有100%的生长抑制作用,这为进一步开发潜在的抗菌药物带来了希望。 图形概要
A novel approach for the synthesis of functionalized hydroxylamino derivative of dihydroquinazolinones
Abstract A new metal-free and modular approach for the synthesis of various functionalized dihydroquinazolinones has been developed from isatoic anhydride, amines, 4-chloro-N-hydroxybenzimidoylchloride to yield up to 71%. The reaction has been screened in various bases, solvents at different temperatures. The substrate scope of the reaction has been studied with various amines and the possible reaction
Base mediated spirocyclization of quinazoline: one-step synthesis of spiro-isoindolinone dihydroquinazolinones
作者:Rapolu Venkateshwarlu、V. Narayana Murthy、Krishnaji Tadiparthi、Satish P. Nikumbh、Rajesh Jinkala、Vidavalur Siddaiah、M. V. Madhu babu、Hindupur Rama Mohan、Akula Raghunadh
DOI:10.1039/c9ra09567e
日期:——
A novel approach for the spiro-isoindolinone dihydroquinazolinones has been demonstrated from 2-aminobenzamide and 2-cyanomethyl benzoate in the presence of KHMDS as a base to get moderate yields.