排序方式: 共有12条查询结果,搜索用时 15 毫秒
1.
Bis(indoyl)methanes have been synthesized in excellent yields in the presence of catalytic amount of Cu1.5PMo12O40 in molten tetraethylammonium chloride as an ionic liquid. The catalyst is recovered and recycled. 相似文献
2.
New derivatives of 5(4H)-quinazolinone containing 2-imidazolin-5-one rings have been prepared from 5(4H)-oxazolone derivatives. 相似文献
3.
A convenient synthesis of functionalized 2-iminothiazolidin-4-ones and thiadiazoloquinazolinones has been achieved by the
reaction of dialkyl acetylenedicarboxylates (DAAD) with 1-pheny-3-pyridin-2-yl-thiourea (1) and 3-amino-2-mercapto-3H-quinazolin-4-one (8), respectively. The starting materials for these processes were prepared from phenyl isothiocyanate, 2-aminopyridine for
(1) and anthranilic acid, carbon disulfide, hydrazine for (8). Treatment of these compounds with DAAD resulted in the formation of an intermediate that readily underwent intramolecular
cyclization to afford functionalized five membered heterocyclic rings was formed. 相似文献
4.
Iran Sheikhshoaie Hojatollah Khabazzadeh Samira Saeid-Nia 《Transition Metal Chemistry》2009,34(5):463-466
[Fe(III)(salen)]Cl (salen = N,N′-ethylenebis(salicylimine)) is an efficient catalyst for the electrophilic substitution of
indole with carbonyl compounds to afford the corresponding bis(indolyl)methanes in good yields in molten tetrabutylammonium
bromide as an ionic liquid. Notable features of this new procedure are shorter reaction times, cleaner reaction profiles,
and simple experimental and work-up procedures. 相似文献
5.
Hojatollah Khabazzadeh Esmat Tavakilinejad Kermani Daryush Afzali Asghar Amiri Arman Jalaladini 《Arabian Journal of Chemistry》2012,5(2):167-172
Polyhydroquinoline derivatives have been prepared efficiently in a one-pot synthesis via Hantzsch condensation using Cs2.5H0.5PW12O40 as a heterogeneous and reusable catalyst. The present method uses molten salt media instead of hazardous organic solvents. The present methodology offers several advantages such as simple procedure, excellent yields, and a short reaction time. 相似文献
6.
Hojatollah Khabazzadeh Iran Sheikhshoaie Samira Saeid-Nia 《Transition Metal Chemistry》2010,35(1):125-127
An efficient synthesis of various substituted Hantzsch-1,4-dihydropyridines and hexahydroquinolines, using a molybdenum(VI) complex as homogenous catalyst, from aldehydes, β-keto esters or cyclohexadiones and ammonium acetate in molten tetrabutyl ammonium bromide as an ionic liquid is described. This novel method consistently gave excellent yields (70–92%) and short reaction times (7–30 min). 相似文献
7.
Efficient electrophilic substitution reaction of indole with various carbonyl compounds were carried out using a catalytic amount of LaCl3 · 7H2O in molten tetraethylammonium chloride as an ionic liquid to afford the corresponding bis(indolyl)methanes in excellent yields. 相似文献
8.
Hadi Mahmoudi Moghaddam Hadi Beitollahi Somayeh Tajik Shohreh Jahani Hojatollah Khabazzadeh Reza Alizadeh 《Russian Journal of Electrochemistry》2017,53(5):452-460
A novel carbon paste electrode modified with ZnO nanorods and 2-(4-oxo-3-phenyl-3,4-dihydroquinazolinyl)-N′-phenyl-hydrazinecarbothioamide (2PHCZNCPE) was fabricated and employed to study the electrocatalytic oxidation of droxidopa, using cyclic voltammetry, chronoamperometry and square wave voltammetry as diagnostic techniques. It has been found that the oxidation of droxidopa at the surface of modified electrode occurs at a potential of about 435 mV less positive than that of an unmodified carbon paste electrode. Square wave voltammetry exhibits a linear dynamic range from 7.0 × 10–8 to 3.0×10?4 M and a detection limit of 45.0 nM for droxidopa. Finally this modified electrode was used for simultaneous determination of droxidopa and carbidopa. 相似文献
9.
Seyyed Naeim Ghattali Kazem Saidi Hojatollah Khabazzadeh 《Research on Chemical Intermediates》2014,40(1):281-291
A heterogeneous reaction with the ammonium salt of 12-tungstophosphoric acid as catalyst has been designed for synthesis of 1,4-dihydropyridine and polyhydroquinoline via the Hantzsch condensation. Molten tetrabutylammonium bromide ionic liquid was used as reaction medium. 相似文献
10.
Hojatollah Khabazzadeh Esmat Tavakolinejad Kermani Tayebeh Jazinizadeh 《Arabian Journal of Chemistry》2012,5(4):485-488
A simple ammonium salt of sulfuric acid in molten state was used as a cheap and mild acidic ionic liquid for efficient synthesis of 3,4-dihydropyrimidin-2(1H)-ones in good to excellent yields. 相似文献