Cyanuric Chloride Catalyzed Mild Protocol for Synthesis of Biologically Active Dihydro/Spiro Quinazolinones and Quinazolinone-glycoconjugates
作者:Moni Sharma、Shashi Pandey、Kuldeep Chauhan、Deepty Sharma、Brijesh Kumar、Prem M. S. Chauhan
DOI:10.1021/jo2020856
日期:2012.1.20
We have developed an efficient cyanuric chloride (2,4,6-trichloro-1,3,5-triazine, TCT) catalyzed approach for the synthesis of 2,3-dihydroquinazolin-4(1H)-one (3a–3x), 2-spiroquinazolinone (5, 7), and glycoconjugates of 2,3-dihydroquinazolin-4(1H)-one (10a, 10b) derivatives. The reaction allows rapid cyclization (8–20 min) with 10 mol % cyanuric chloride to give skeletal complexity in good to excellent
Ruthenium-catalysed oxidative synthesis of heterocycles from alcohols
作者:Andrew J. A. Watson、Aoife C. Maxwell、Jonathan M. J. Williams
DOI:10.1039/c1ob06516e
日期:——
Ruthenium-catalysed hydrogen transfer has been successfully used for the conversion of alcohols into either 2,3-dihydroquinazolines or quinazolines. The choice of reaction conditions allows for the selective formation of either heterocycle and the methodology can also be applied to the sulfonamide analogue.
An environmentally friendly and mild procedure to obtain 2,3-dihydroquinazolin-4(1H)-ones from 2-aminobenzonitriles and aromatic aldehydes has been developed. The reactions took place in water with inorganic base (K3PO4) as the only promoter. Various desired products have been prepared in moderate to good yields under identical conditions. Further transformation of dihydroquinazolinones to quinazolinones was carried out as well with TBHP as the oxidant.
Amberlyst A26 OH as a Recyclable Catalyst for Hydration of Nitriles and Water-Based Synthesis of 4(1H)-Quinazolinones from 2-Aminobenzonitrile and Carbonyl Compounds
作者:Fatemeh Tamaddon、Farzaneh Pouramini
DOI:10.1055/s-0033-1340986
日期:——
Selective hydration of nitriles to primaryamides as well the base-catalyzedsynthesis of 2-substituted 4(1H)-quinazolinones via reaction of 2-aminobenzonitrile with carbonyl compounds using macroporous Amberlyst A26 OH in H2O–EtOH is described. The latter reaction proceeds via tandem hydration of 2-aminobenzonitrile, condensation of the in situ generated 2-aminobenzamide with carbonyl compounds, and
Preparation of 2,3-dihydroquinazolin-4(1H)-one derivatives in aqueous media with β-cyclodextrin-SO<sub>3</sub>H as a recyclable catalyst
作者:Jian Wu、Xianli Du、Juan Ma、Yuping Zhang、Qingcai Shi、Lijun Luo、Baoan Song、Song Yang、Deyu Hu
DOI:10.1039/c3gc42400f
日期:——
A β-cyclodextrin-SO3H-assisted, convenient and efficient strategy for the preparation of 2,3-dihydroquinazolin-4(1H)-one derivatives in aqueous media is presented.