- A simple and efficient one-step synthesis of 2,4,10a-triaryl-1,10a-dihydro- 2H-pyrazino[2,1-b][1,3] benzothiazoles catalyzed by p-toluene sulfonic acid
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A series of 2,4,10a-triaryl-1,10a-dihydro-2H-pyrazino[2,1-b][1,3] benzothiazoles were prepared in good yields by the reaction of 2-[(2-oxo-2-arylethyl) anilino]-1-aryl-1-ethanones with 2-aminothiophenol in the presence of p-toluenesulfonic acid under solv
- Ravindran,Muthusubramanian,Selvaraj,Perumal
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- Ultrasound-mediated synthesis of N,N-bis(phenacyl)aniline under solvent-free conditions
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An efficient method for the synthesis of N,N-bis(phenacyl)anilines was developed via smooth condensation of anilines with α-bromoacetophenones in the presence of sodium carbonate as acid acceptor and polyethylene glycol 400 (PEG 400) as catalyst at room t
- He, Jingyu,Shi, Lanxiang,Liu, Sijie,Jia, Peng,Wang, Juan,Hu, Ruisheng
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p. 213 - 216
(2014/03/21)
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- Synthesis and photochemical properties of 2,4,6,-triaryl-4h-1,4-oxazines
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A series of 2,4,6-triaryl-4H-1,4-oxazines was synthesized, and their photochemical properties were studied. The 2,4,6-triaryl-4H-1,4-oxazines underwent photoreaction to N-(1-methoxy-2-oxo-2-arylethyl)-N-arylformamides determined by 1H NMR, 13C NMR, MS, and single crystal X-ray diffraction analyses.
- Tan, Hongbo,Xin, Hongxing,Yan, Hong
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p. 359 - 373
(2014/03/21)
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- Synthesis of 4H-1,4-oxazines as transthyretin amyloid fibril inhibitors
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4H-1,4-oxazines were designed as transthyretin (TTR) amyloid fibril inhibitors based on an analysis of the interactions between known small molecule inhibitors and TTR by molecular docking. A series of 2,4,6-triaryl-4H-1,4- oxazines was synthesized by the
- Li, Weipeng,Duan, Xiaowei,Yan, Hong,Xin, Hongxing
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supporting information
p. 4546 - 4550
(2013/08/23)
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- Synthesis of oxathiane and morpholine from acyclic precursors: A modified Mitsunobu reaction
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Synthesis of a set of isomeric 2,4,6-triarylmorpholines and 2,6-diaryloxathianes from the corresponding 1,5-diols has been described. The method provides an efficient route to six-membered heterocycles from acyclic diols and is found to be better than Mitsunobu procedure in yield and waste management. In a related study, the ring contraction of pyranone to two isomeric cyclopentenone derivatives through Nazarov reaction has been noticed.
- Paul, Nidhin,Kaladevi, Selvam,Beneto, Arockiam Jesin,Muthusubramanian, Shanmugam,Bhuvanesh, Nattamai
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scheme or table
p. 6892 - 6901
(2012/09/11)
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- Synthesis of novel 3,5,7-triaryl-5,6-dihydro-4H-1,2,5-triazepines
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(Chemical Equation Presented) Several hitherto unknown 3,5,7-triaryl-5,6- dihydro-4H-1,2,5-triazepines have been synthesised by cyclocondensation of N,N-bis(phenacyl)anilines with hydrazine hydrate in ethanol or ethyleneglycol under reflux condition. Incr
- Ravindran, Gurusamy,Muthusubramanian, Shanmugam,Selvaraj, Sanguvan,Perumal, Subbu
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p. 133 - 136
(2008/09/16)
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- A new approach to the preparation of 1,3,4-triarylpyrroles
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A class of 1,3,4-triaryl-2,5-dihydropyrroles were synthesized using the McMurry coupling reaction as the key step. The non-catalytic photoconversion of 1,3,4-triaryl-2,5-dihydropyrroles furnished 1,3,4-triarylpyrroles in good yields (63-89%). It was found
- De Zeng, Xing,Chen, Yi
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p. 490 - 492
(2007/10/03)
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- Study on photochromism of diarylethenes with a 2,5-dihydropyrrole bridging unit: A convenient preparation of 3,4-diarylpyrroles from 3,4-diaryl-2,5- dihydropyrroles
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Symmetric and nonsymmetric diarylethenes with a 2,5-dihydropyrrole bridging unit have been prepared, and the photochromic properties are investigated. Both symmetric and nonsymmetric diarylethenes with 2,5-dihydropyrrole bridging units undergo reversible ring-opening and ring-closing photoisomerization reactions in nonpolar solvents with UV/vis light, and some of them exhibit good fatigue resistance and no marked degradation detected after 10 cycles via an on/off switch. In polar solvents, however, photochromic diarylethenes with 2,5-dihydropyrrole bridging units produce 3,4-diarylpyrrole derivatives instead of the ring-closing isomer of diarylethenes with UV light irradiation. A class of N-substituted 3,4-diphenylethenes with 2,5-dihydropyrrole bridging units were prepared and used as templates to investigate the conversion reactions. The mechanism of photoconversion of 3,4-diaryl-2,5-dihydropyrroles to 3,4-diarylpyrroles was explored as well.
- Chen, Yi,Zeng, De X.,Xie, Nan,Dang, Yi Z.
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p. 5001 - 5005
(2007/10/03)
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- Photochemistry of N-heterocycles. 7: Light induced reductive ring contractions of sixmembered cyclic iminium ions
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Photochemically induced reductive ring contractions, previously observed for 2,5-dihydro-1,2,4-triazines, have also been verified for 1,4-dihydropyrimidines 2a,b, the dihydro-1,2,4,5-tetrazine 9, and dihydro-1,3,5-triazines 11a,b giving rise to fivemembered fully unsaturated heterocycles (pyrroles 4a,b, imidazoles 13a,b, and triazole 10, respectively). The 1,4-dihydropyrazines 15a-j tend to decompose in acidified 2-propanol in the dark, but on irradiation they also undergo reductive ring contraction furnishing solely the 1,2,5-triarylpyrroles 16a-d rather than the (a priori also possible) isomeric 1,3,4-triarylpyrroles 17a-d. In contrast, the 3,6-diphenylpyrid-azine 18 gives the 4-isopropyl-analogue 19 in low yield upon irradiation in hydrogen chloride saturated 2-propanol. Wiley-VCH Verlag GmbH, 2000.
- Nagy, Jozsef,Madarasz, Zoltan,Rapp, Rudolf,Szoelloesy, Aron,Nyitrai, Jozsef,Doepp, Dietrich
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p. 281 - 290
(2007/10/03)
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- Beckmann fragmentation of diphenylcarbamoylated N-aryldiphenacylamine dioximes. New method for the synthesis of imidazooxadiazolones
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N-Aryl-N,N-diphenacylamine dioximes were prepared by the reaction of corresponding arylamines with α-bromoacetophenone oxime in ethanol-water at room temperature. These compounds reacted with aryl isocyanates in acetonitrile to give imidazooxadiazolones 9. The probable mechanism of the reaction is discussed.
- Coskun, Necdet,Tat, Fatma Tirli,Gueven, Oezden Oezel
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p. 3889 - 3894
(2007/10/03)
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- Preparation of Stable 1,4-Dihydropyrazines
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The N-phenacylarylamine (4) gives the N,N-diphenacyl derivative (5) on treatment with phenacyl bromine under phase-transfer catalysis conditions.Condensation of (5) with an arylamine results in the formation of the thermally stable 1,4-diaryl-3,5-diphenyl
- Fourrey, Jean-Louis,Beauhaire, Josiane,Yuan, Chun Wei
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p. 1841 - 1844
(2007/10/02)
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