排序方式: 共有29条查询结果,搜索用时 15 毫秒
1.
P.D. Lokhande Abdul Raheem S.T. Sabale A.R. Chabukswar S.C. Jagdale 《Tetrahedron letters》2007,48(39):6890-6892
The reaction of substituted salicyaldehydes with hydrazine hydrochloride under different conditions gave the corresponding 1-H indazoles. However, the reaction of benzaldehydes with hydrazine hydrate under the same conditions yielded only hydrazones. 相似文献
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The acid catalyzed hydrolysis of some alkylhydroxamic acids has been studied spectrophotometrically in perchloric, hydrochloric and sulfuric acids. Plots of the first order rate constant, kobs against H+ show maxima, which are caused by protonation of the substrate. The mechanism of hydrolysis is found to be similar to that of amides. The variation of reaction rate with acid concentration can be described by a two-parameter equation.
, , , . kobs [H+] , . . .相似文献
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A Pd(II)-catalyzed reaction engaging alkenyl β-keto esters is reported that leads to the formation of 1-naphthols and an unexpected generation of arylpalladium(II) species. Interception of the in situ generated arylpalladium(II) species in a Mizoroki-Heck reaction, together with additional mechanistic studies, provided strong evidence in support of the first aromatization-driven β-carbon elimination process. A single Pd catalyst served to promote a series of both C-C bond forming and cleavage events in an unprecedented manner. 相似文献
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A concise enantioselective synthesis of (S)-903, an inotropic agent, is described in nine linear steps and 95% ee based on asymmetric dihydroxylation of cinnamate ester and Co-catalyzed multifunctional reduction of several functional groups leading to the construction of core tetrahydroquinolin-3-ol, as the key steps. 相似文献
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Synthesis and Cation Recognition Study of Novel Benzo Crown Ether Functionalized Enamine Derivatives
Dayanand R. Patil Dattatraya R. Chandam Abhijeet G. Mulik Suryabala D. Jagdale Prasad P. Patil 《合成通讯》2013,43(16):1902-1911
A novel series of benzo crown ether (dibenzo 18-crown-6 ether, benzo 18-crown-6 ether, and benzo 15-crown-5 ether) functionalized enamines derivatives from amino benzo crown ether (4-amino dibenzo 18-crown-6 ether, 4-amino benzo 18-crown-6 ether, 4-amino benzo 15-crown-5 ether) and substituted 3-(dimethylamino)-1-phenylprop-2-en-1-one compounds have been synthesized. All the synthesized compounds were characterized by infrared, 1H NMR, 13C NMR, distortionless enhancement polarization transfer, and mass and elemental analysis techniques. The cation recognition property for benzo crown ether enamine 8a was studied by absorption and fluorescence spectroscopy. 相似文献
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Arun R. Jagdale 《Tetrahedron letters》2008,49(23):3790-3793
CoCl2 catalyzes effectively the chemoselective reduction of phenyl carboxylic esters to the corresponding saturated alcohols in high yields using NaBH4 at ambient conditions. By employing this methodology, the synthesis of (R)-tolterodine, a muscarinic receptor antagonist, has been achieved in high yield and optical purity. 相似文献
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The application of nanopipettes, developed first as a tool for electrochemistry and electrophysiology, as tools for mass spectrometry is considered. Recent examples of advances in electrospray ionization and sampling for mass spectrometry with nanopipettes is discussed. These examples show a scientific intersection that is ripe for further development. 相似文献
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Phenoxides supported on Amberlite IRA 400 on reaction with sodium salt of chloroacetic acid gave corresponding aryloxy acetic acid in high yields. Interestingly nitrophenols, 4-hydroxy coumarin and p-hydroxy ethylbenzoate gave excellent yields of the product. 相似文献
10.
Polymer‐Supported Sulfonic Acid‐Catalyzed Candid Synthesis and Photophysical Properties of 2H‐indazolo[2,1‐b]phthalazinetriones 下载免费PDF全文
Abhijeet Mulik Dattatraya Chandam Prasad Patil Dayanand Patil Suryabala Jagdale Sandip Sankpal Madhukar Deshmukh 《Journal of heterocyclic chemistry》2015,52(3):931-937
Polystyrene‐supported sulfonic acid has been found to be an efficient catalyst for the one‐pot, three‐component synthesis of 2H‐indazolo[2,1‐b]phthalazinetriones in greener solvent glycerol. Use of greener solvent glycerol along with a polymer‐supported, low toxic, and inexpensive catalyst renders the method eco‐friendly. High yields, simple product isolation procedure, and fluorescent and electroluminescent natures of the products are the noteworthy aspects of this protocol. 相似文献