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Alum Catalyzed Convenient Synthesis of Quino[2,3-b][1,5 benzoxazepine α-Aminophosphonate Derivatives
Sonar, Swapnil S.,Sadaphal, Sandip A.,Shitole, Nana V.,Jogdand, Nivrutti R.,Shingate, Bapurao B.,Shingare, Murlidhar S. Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.8
We have described an efficient synthesis of quino[2,3-b][1,5]benzoxazepine α-aminophosphonate derivatives by the nucleophilic addition of triethyl phosphite to substituted quino[2,3-b][1,5]benzoxazepines promoted by easily available, inexpensive and mild catalyst KAl(S$O_4)_2{\cdot}12H_2$O(alum). The reactions proceed smoothly at room temperature under solvent-free reaction conditions and providing high yield of product in very short reaction time.
Solid-Phase Synthesis of 2-Arylbenzothiazole Using Silica Sulfuric Acid under Microwave Irradiation
Kirti S. Niralwad,Bapurao B. Shingate,Murlidhar S. Shingare 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.4
The condensation of several aromatic/heteroaromatic aldehydes with 2-aminothiophenol catalyzed by silica sulfuric acid under microwave irradiation afforded 2-arylbenzothiazoles in high yields and short reaction times under solvent-free conditions. The major advantages of the present method are good yields, ecofriendly, reusable catalyst, mild and solvent-free reaction conditions.
Alum Catalyzed Convenient Synthesis of Quino[2,3-b][1,5]benzoxazepine α-Aminophosphonate Derivatives
Swapnil S. Sonar,Sandip A. Sadaphal,Nana V. Shitole,Nivrutti R. Jogdand,Bapurao B. Shingate,Murlidhar S. Shingare 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.8
We have described an efficient synthesis of quino[2,3-b][1,5]benzoxazepine α-aminophosphonate derivatives by the nucleophilic addition of triethyl phosphite to substituted quino[2,3-b][1,5]benzoxazepines promoted by easily available, inexpensive and mild catalyst KAl(SO4)2・12H2O (alum). The reactions proceed smoothly at room temperature under solvent-free reaction conditions and providing high yield of product in very short reaction time.
Alum Catalyzed Simple and Efficient Synthesis of Bis(indolyl)methanes by Ultrasound Approach
Swapnil S. Sonar,Sandip A. Sadaphal,Amol H. Kategaonkar,Rajkumar U. Pokalwar,Bapurao B. Shingate,Murlidhar S. Shingare 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.4
Alum (KAl(SO4)2․12H2O) is an inexpensive, efficient, non‐toxic and mild catalyst for the synthesis of bis(indolyl)methanes by the reaction of 1H-indole with various aldehydes/ketones under the influence of ultrasound irradiation in solvent‐free condition. The remarkable advantages of this method are the simple experimental procedures, shorter reaction times, high yields of product and green aspects by avoiding toxic catalysts and solvents.
Alum Catalyzed Simple and Efficient Synthesis of Bis(indolyl)methanes by Ultrasound Approach
Sonar, Swapnil S.,Sadaphal, Sandip A.,Kategaonkar, Amol H.,Pokalwar, Rajkumar U.,Shingate, Bapurao B.,Shingare, Murlidhar S. Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.4
Alum $(KAl(SO_4)_2{\cdot}12H_2O)$ is an inexpensive, efficient, non‐toxic and mild catalyst for the synthesis of bis(indolyl)methanes by the reaction of 1H-indole with various aldehydes/ketones under the influence of ultrasound irradiation in solvent‐free condition. The remarkable advantages of this method are the simple experimental procedures, shorter reaction times, high yields of product and green aspects by avoiding toxic catalysts and solvents.
Niralwad, Kirti S.,Shingate, Bapurao B.,Shingare, Murlidhar S. Korean Chemical Society 2011 대한화학회지 Vol.55 No.3
Potassium dihydrogen phosphate는 마이크로파 조사조건에서 용매 없이 페놀과 아세토아세트산 에틸의 Pechmann 축합반응에 의하여 쿠마린을 합성하는 효과적인 촉매로 밝혀졌다. 이 방법은 쿠마린 합성에 있어서 소량의 촉매를 필요로 하며 수율이 높고, 반응이 깨끗할 뿐만 아니라 반응 시간이 짧은 장점들을 가지고 있다. Potassium dihydrogen phosphate was found to be an efficient catalyst for the Pechmann condensation of phenols with ethyl acetoacetate, leading to the formation of coumarins under microwave-irradiation and solvent-free condition. This procedure offers several advantages, including the low loading of catalysts, high yields, clean reactions, short reaction time for the synthesis of coumarins.
An Expeditious Room Temperature Stirring Method for the Synthesis of Isoxazolo[5,4-b]quinolines
Niralwad, Kirti S.,Shingate, Bapurao B.,Shingare, Murlidhar S. Korean Chemical Society 2011 대한화학회지 Vol.55 No.5
The synthesis of different derivatives of isoxazolo[5,4-b]quinoline by the cyclization reaction of various substituted oximes of quinoline using mild base at ambient temperature. The formation of isoxazolo[5,4-b]quinoline, as a consequence of cheaper and more readily available $K_2CO_3$ and DMF participating in the reaction, is documented.
Solid-Phase Synthesis of 2-Arylbenzothiazole Using Silica Sulfuric Acid under Microwave Irradiation
Niralwad, Kirti S.,Shingate, Bapurao B.,Shingare, Murlidhar S. Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.4
The condensation of several aromatic/heteroaromatic aldehydes with 2-aminothiophenol catalyzed by silica sulfuric acid under microwave irradiation afforded 2-arylbenzothiazoles in high yields and short reaction times under solvent-free conditions. The major advantages of the present method are good yields, ecofriendly, reusable catalyst, mild and solvent-free reaction conditions.
Amol H. Kategaonkar,Swapnil S. Sonar,Rajkumar U. Pokalwar,Atul H. Kategaonkar,Bapurao B. Shingate,Murlidhar S. Shingare 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.6
An efficient and novel one-pot synthesis of new 3,4-dihydro-3-substituted-2H-naphtho[2,1-e][1,3]oxazine derivatives from 1-naphthol, various anilines and formalin at room temperature grinding is presented. The six-membered N,O-heterocyclic skeleton was constructed via zirconyl(IV) chloride promoted Mannich type reaction. In vitro antimicrobial activities of synthesized compounds have been investigated against Gram-positive Bacillus subtilis,Gram negative Escherichia coli and two fungi Candida albicans and Aspergillus niger in comparison with standard drugs. The results of preliminary bioassay indicate that some of title compounds possess significant antibacterial and antifungal activity.