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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.
Shinde, Pravin V.,Shingate, Bapurao B.,Shingare, Murlidhar S. Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
In the present work, catalytic activity of basic alumina in water has been demonstrated for the synthesis of poly functionalized pyridines. This strategy has some remarkable advantages, such as use of heterogeneous catalyst in aqueous media, reusability of catalyst and scalable approach.
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.
Shinde, Pravin V.,Shingate, Bapurao B.,Shingare, Murlidhar S. Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.4
In the present work, successful implementation of ultrasound irradiations for the rapid synthesis of 1,5-benzodiazepine derivatives under solvent-free conditions is demonstrated. Use of a novel catalyst i.e. camphor sulphonic acid in combination with ultrasound technique is reported for the first time. Comparative study for the synthesis of 1,5-benzodiazepines using conventional as well as ultrasonication method is discussed.
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.
Pravin V. Shinde,Bapurao B. Shingate,Murlidhar S. Shingare 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.4
In the present work, successful implementation of ultrasound irradiations for the rapid synthesis of 1,5-benzodiazepine derivatives under solvent-free conditions is demonstrated. Use of a novel catalyst i.e. camphor sulphonic acid in combination with ultrasound technique is reported for the first time. Comparative study for the synthesis of 1,5-benzodiazepines using conventional as well as ultrasonication method is discussed.
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.
Sapkal, Suryakant B.,Shelke, Kiran F.,Shingate, Bapurao B.,Shingare, Murlidhar S. Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.2
Nickel nanoparticles (Ni NPs) appeared to exhibit the catalytic activity in one-pot cyclocondensation reaction for the preparation of 3,4-dihydropyrimidine-2(1H)-ones via Biginelli reaction from aromatic/heteroaromatic/aliphatic aldehydes, urea/thiourea and ethyl acetoacetate under microwave irradiation has been described. The UV absorbance spectra showed metallic Ni characteristics and appreciate with the particle size determined by Transmission electron microscopy (TEM). After reaction course the Ni NPs can be re-covered and reused without any apparent loss of activity.
Sapkal, Suryakant B.,Shelke, Kiran F.,Shingate, Bapurao B.,Shingare, Murlidhar S. Korean Chemical Society 2010 대한화학회지 Vol.54 No.6
마이크로 반응을 이용하여 $NaHSO_4/SiO_2$을 촉매로 하는 solvent-free 합성을 통하여 $\beta$-enaminone 과 2-methylquinolin-4(1H)-one 및 그 유도체를 합성하는 효율적인 방법을 개발하였다. 반응 시간이 짧고, 수율이 좋았으며, 마이크로웨이브를 사용하지 않는 반응보다는 높은 선택성, 간단성, 무용매 반응 및 친환경적인 반응이다. An efficient and simplified protocol for $NaHSO_4/SiO_2$ catalyzed solvent-free synthesis of $\beta$-enaminone and 2-methylquinolin-4(1H)-one derivatives under microwave irradiation is described. A series of functionalized derivatives have been synthesized in shorter reaction times with moderate to good yields. The use of milder catalyst in non-conventional method offers significant advantages over conventional methods, such as higher selectivities, simplicity, solvent-free reaction and non-environmental polluting conditions.