One-Step Conversion of 2-Amino-N′-arylbenzamidines into 3-Aryl-4-imino-3,4-dihydroquinazoline-2-carbonitriles Using 4,5-Dichloro-1,2,3-dithiazolium Chloride
摘要:
2-Amino-N'-arylbenzamidines react with 4,5-dichloro-1,2,3-dithiazolium chloride (Appel salt) in the presence of Hunig's base (2 equiv) to give in one step 3-aryl-4-imino-3,4-dihydroquinazoline-2-carbonitriles in 53-81% yields. Nine examples are presented along with the single crystal X-ray structure of 4-imino-3-phenyl-3,4-dihydroquinazoline-2-carbonitrile. Furthermore, the behavior of the latter toward both acid and base hydrolysis is investigated. All new compounds are fully characterized, and a mechanistic rationale for the formation of the iminoquinazolines is provided.
Synthesis of N-aryl-3H-indazol-3-imine and N-aryl-1H-indazol-3-amine via Na2WO4/H2O2 mediated by intramolecular N–N coupling
作者:Mahdieh Sadat Sajadi、Ali Darehkordi、Seyed Mohammad Sadegh Hosseini
DOI:10.1016/j.tet.2021.132023
日期:2021.3
convenient method for synthesis of N-aryl-1H-indazol-3-amine and N-aryl-3H-indazol-3-imine compounds has been described via intramolecular oxidative cyclization of the 2-amino-Nˊ-arylbenzimidamide intermediates by Na2WO4/H2O2 in excellent yields. This procedure has several advantages such as mild reaction conditions, shortreaction time, and excellent yields, making this methodology practical.
已经描述了一种通过N-芳基-1H-吲唑-3-胺和N-芳基-3H-吲唑-3-亚胺化合物的快速方便的合成方法,该方法是通过分子内2-氨基-Naryl-芳基苯甲酰胺酰胺中间体的氧化环化反应。 Na 2 WO 4 / H 2 O 2的产率很高。该方法具有许多优点,例如温和的反应条件,短的反应时间和优异的收率,使得该方法实用。
The reaction of 2-amino- N ′-arylbenzamidines with tetracyanoethene reinvestigated: routes to imidazoles, quinazolines and quinolino[2′,3′:4,5]imidazo[1,2- c ]quinazoline-8-carbonitrile
作者:Styliana I. Mirallai、Maria Manoli、Panayiotis A. Koutentis
DOI:10.1016/j.tet.2015.09.049
日期:2015.11
with tetracyanoethene (TCNE) to give 2-[2-(2-aminophenyl)-5-imino-1-phenyl-1H-imidazol-4(5H)-ylidene]malononitrile (11a), 4-(phenylamino)quinazoline-2-carbonitrile (5a) and 4-imino-3-phenyl-3,4-dihydroquinazoline-2-carbonitrile (9a). By optimizing the reaction conditions each of the compounds can be isolated as the main product and seven examples of these reactions are described. The [1H-imidazol-4(
Reinvestigating the synthesis of N-arylbenzamidines from benzonitriles and anilines in the presence of AlCl3
作者:Panayiotis A. Koutentis、Styliana I. Mirallai
DOI:10.1016/j.tet.2010.04.103
日期:2010.7
conditions, allowing for the higher yielding synthesis of N-phenylbenzamidine 3a (83%). Using these modified conditions several N-(4-substituted phenyl)benzamidines can be prepared including the N-(4-methoxyphenyl)benzamidine 3b (93%) and the previously unobtainable 2-amino-N-(4-methoxyphenyl)benzamidine 3l (56%). All new compounds are fully characterised.