Synthesis, Electrochemical and Optical Properties of Stable Yellow Fluorescent Fluoranthenes
摘要:
A novel series of thermally stable yellow light emitting fluoranthenes with an amine donor and a nitrite acceptor was prepared from a ketene-S,S-acetal under mild conditions without using an organometal catalyst. The organic light emitting device of yellow fluoranthene 10b exhibited substantially low turn-on voltage (2.6 V) and maximum brightness of 470 Cd/m(2) with luminance efficiency of 2.0 Cd/A without using any dopant.
Diversity-oriented general protocol for the synthesis of privileged oxygen scaffolds: pyrones, coumarins, benzocoumarins and naphthocoumarins
作者:Atul Goel、Gaurav Taneja、Ashutosh Raghuvanshi、Ruchir Kant、Prakas R. Maulik
DOI:10.1039/c3ob40859k
日期:——
A new general methodology for the synthesis of various functionalized privileged oxygen heterocyclic scaffolds, viz. pyrones, coumarins, and benzannulated coumarins, is developed. The synthesis proceeds through carbanion-induced ring transformation of lactones with various methylene carbonyl compounds followed by DDQ-mediated unprecedented oxidative cleavage of oxaylidenes intermediates. Studies of
Acetyltrimethylsilane: A Novel Reagent for the Transformation of 2<i>H</i>-Pyran-2-ones to Unsymmetrical Biaryls
作者:Atul Goel、Deepti Verma、Manish Dixit、Resmi Raghunandan、P. R. Maulik
DOI:10.1021/jo052085y
日期:2006.1.1
An expeditioussynthesis of unsymmetrical biaryls functionalized with electron-withdrawing or -donating substituents is described and illustrated by carbanion-induced ring transformation of 2H-pyran-2-one using acetyltrimethylsilane (ATMS) as a novel reagent in good yield. The novelty of the reaction lies in the creation of an aromatic ring from 2H-pyran-2-ones via two-carbon insertion from ATMS used
Carbanion induced synthesis of annulated unsymmetrical biaryls through ring transformation of 2H-pyran-2-oneCentral Drug Research Institute communication no. 6207
作者:Vishnu Ji Ram、Nidhi Agarwal、Abhishek S. Saxena、Ashoke Sharon、Prakas R. Maulik
DOI:10.1039/b203544h
日期:2002.6.7
An innovative and convenient one-pot synthesis of unsymmetrical macrocyclic biaryls (3, 5 and 8), dibenzo[a,c]cycloheptenes (10), 3,4-dihydro-2(1H)-naphthones (15), tetrahydroisoquinolines (18), dihydro-1H-isothiochromenes (20), benzo[c]thiochromenes (22) and 2,3-dihydro-1-benzothiophenes (24) is described. These compounds are obtained through base-catalyzed ring transformation reactions of suitably functionalized 2H-pyran-2-ones (1,6) by a carbanion, generated from
cycloalkanone (2,4,7), benzosuberone (9), cyclohexanedione monoketal (12), 4-piperidone (17), tetrahydrothiopyran-4-one (19), thiochroman-4-one (21) or tetrahydrothiophene-3-one (23).
Carbanion induced, base-catalyzed, synthesis of highly functionalized 8-aryl-3,4-dihydro-2(1H)-naphthalenones from 2H-pyran-2-ones
作者:Vishnu Ji Ram、Nidhi Agarwal、Farhanullah
DOI:10.1016/s0040-4039(02)00528-2
日期:2002.4
A general and efficient synthesis of 8-aryl-5-methoxycarbonyl-6-methylsulfanyl-3,4-dihydro-2(1H)-naphthalenones 4a–i and 8-aryl-5-cyano-6-sec-amino-3,4-dihydro-2(1H)-naphthalenones 4l–r has been delineated from the acid hydrolysis of 8-aryl-5-methoxycarbonyl-6-methylsulfanyl-3,4-dihydro-2(1H)-naphthalenone-(2,2-dimethyltrimethylene)ketals 3a–i and 8-aryl-5-cyano-6-sec-amino-3,4-dihydro-2(1H)-naphthalenone-(2
Stereoselective alkenylation of a 1,3-disubstituted pyrazol-5-one through ring transformation of 2H-pyran-2-ones
作者:Diptesh Sil、Rishi Kumar、Ashoke Sharon、Prakas R. Maulik、Vishnu Ji Ram
DOI:10.1016/j.tetlet.2005.03.207
日期:2005.5
A one-pot stereoselective alkenylation of 1-(3-chlorophenyl)-3-methyl-1,4-dihydro-5-pyrazolone 2 by 2H-pyran-2-ones 1 to give (E,E)-5-aryl-5-[1-(3-chlorophenyl)-3-methyl-5-oxo-1,5-dihydropyrazol-4- ylidene]-3-methylsulfanyl-pent-3-en-carbonitrite/methyl carboxylate 3 has been delineated through ring transformation in moderate yields. (c) 2005 Elsevier Ltd. All rights reserved.