A new T3P®-assisted, convenient and efficient procedure for the synthesis of dihydroquinazolinones is described. The main advantages of this protocol include its practical simplicity, short reaction times and particularly the ease with which products are isolated.
Sulfonic acid functionalized Wang resin (Wang-OSO3H) as polymeric acidic catalyst for the eco-friendly synthesis of 2,3-dihydroquinazolin-4(1H)-ones
作者:A.V. Dhanunjaya Rao、B.P. Vykunteswararao、T. Bhaskarkumar、Nivrutti R. Jogdand、Dipak Kalita、Jaydeep Kumar D. Lilakar、Vidavalur Siddaiah、Paul Douglas Sanasi、Akula Raghunadh
DOI:10.1016/j.tetlet.2015.06.004
日期:2015.8
An efficient and green approach has been developed for the synthesis of 2-substituted 2,3-dihydroquinazolin-4(1H)-ones directly from corresponding substituted aromatic and aliphatic aldehyde and anthranilamide using recyclable polymer supported sulfonic acid catalyst under aqueous conditions. Environmental acceptability, operational simplicity, low cost, excellent functional group compatibility, and
protocol to access heterocyclic dihydroquinazolinones by a transition-metal-free process, involving the reaction of 2-aminobenzonitriles with aldehydes in the presence of KOtBu. The method is compatible with aromatic ketones providing 2,2-disubstituted dihydroquinazolinones in high yields. This reaction proceeds feasibly at room temperature and features a broad substrate scope and tolerance to a range
我们在此报告了一种通过无过渡金属工艺获得杂环二氢喹唑啉酮的有效合成方案,包括在 KO t Bu存在下 2-氨基苯甲腈与醛的反应。该方法与芳族酮兼容,以高产率提供 2,2-二取代二氢喹唑啉酮。该反应在室温下可行,具有广泛的底物范围和对一系列官能团的耐受性。该机制遵循激进的途径。
Application of Organolithium in Organic Synthesis: A Simple and Convenient Procedure for the Synthesis of More Complex 6-Substituted 3 H -Quinazolin-4-ones
作者:Gamal A. El-Hiti
DOI:10.1007/s00706-003-0110-5
日期:2004.3.1
6-Methyl-3 H -quinazolin-4-one reacted with alkyllithium reagents at −78°C in THF to give 2-alkyl-1,2-dihydro-6-methyl-3 H -quinazolin-4-ones in high yields. However, no reaction took place when LDA was used as the lithium reagent. 6-Bromo-3 H -quinazolin-4-one reacted with excessive butyllithium to give 2-butyl-1,2-dihydro-3 H -quinazolin-4-ones in very good yields. However, the lithiation of 6-bromo-3
Ketone-derived 2,3-dihydroquinazolinones in <i>N</i>-heteroarene C–H alkylation <i>via</i> C–C bond scission under oxidative metal catalysis
作者:Pinku Prasad Mondal、Amit Pal、Athira K Prakash、Basudev Sahoo
DOI:10.1039/d2cc04947c
日期:——
activation of pre-aromatic 2,3-dihydroquinazolinone to generate an alkyl radical, supported by mechanistic studies. In addition to the broad scope, good functionality tolerance, late stage functionalization of APIs, and synthesis of a novel Papaverine analogue, the utilization of an N-heteroarene C–H bond and ketone as a non-trivial alkyl radical source represents the salient feature of this method.