50897-91-1Relevant academic research and scientific papers
Synthesis, characterization and structural conformation studies of 2-amino-3-ethoxycarbonyl-4-(4"-methoxy phenyl)-4H-pyrano-[3,2-c]-chromene- 6-methyl-5-one
Naveen,Lakshmi,Manvar, Dinesh,Parecha, Alpesh,Shah, Anamik,Sridhar, M. Anandalwar,Shashidhara Prasad
, p. 733 - 738 (2007)
2-amino-3-ethoxycarbonyl-4-(4'-methoxy Phenyl)-4H-pyrano-[3,2-c]-chromene- 6-methyl-5-one was synthesized by the two-component reaction of 6-methyl-4-hydroxy coumarin with 4'-methoxy-2-cyano cinnamate, which was synthesized by Knoevenagel reaction with 88
Tri-lacunary polyoxometalates of Na8H[PW9O 34] as heterogeneous Lewis base catalysts for Knoevenagel condensation, cyanosilylation and the synthesis of benzoxazole derivatives
Zhao, Shen,Chen, Yang,Song, Yu-Fei
, p. 140 - 146 (2014/03/21)
We reported for the first time the development of tri-lacunary polyoxometalates (POMs) of Na8H[A-PW9O34] ·7H2O and Na8H[B-PW9O 34]·19H2O (Na-A-PW9 and Na-B-PW 9) as highly selective and efficient heterogeneous Lewis base catalysts for Knoevenagel condensation, cyanosilylation of various aldehydes and ketones and the synthesis of benzoxazole derivatives at 25 C under mild conditions. Since both Na-A-PW9 and Na-B-PW9 display no characteristic porosity, it is proposed that the catalytic reactions proceed not only on the surface and interface, but also in the bulk phase. The catalysts can be easily recovered and reused for at least six times without obvious decrease of catalytic activities and the structures of the catalysts remain unchanged after recycling. The easy preparation, high efficiency, reusability of the heterogeneous catalysts of Na-A-PW9 and Na-B-PW9 exhibit great potential for further application.
Nano-silica PAMAM dendrimer as a novel catalyst for Knoevenagel reactions
Hagiwara, Hisahiro,Sekifuji, Masayoshi,Tsubokawa, Norio,Hoshi, Takashi,Suzuki, Toshio
, p. 926 - 927,2 (2020/08/31)
A nano-silica dendrimer, poly(amidoamine)-grafted nanosilica (nano-PAMAM), catalyzed the Knoevenagel reaction of aryl and aliphatic aldehydes with various active methylene compounds at room temperature in good yields. The reaction conditions were mild eno
Unprecedented reaction between ethyl α-cyanocinnamate and o-phenylenediamine: Development of an efficient method for the transfer hydrogenation of electronically depleted olefins
Kumar, Satish,Kapoor, Kamal K.
, p. 2809 - 2814 (2008/02/13)
A reaction between ethyl α-cyanocinnamate and o-phenylenediamine under thermal conditions yielded 2-cyano-3-phenyl-propionic acid ethyl ester, 2-phenyl benzimidazole, and ethyl cyanoacetate. The mechanistic revelations led to the development of a simple and efficient transfer-hydrogenation process from the in situ generated benzimidazolines to activated olefins under solventless and catalyst-free conditions. Georg Thieme Verlag Stuttgart.
A simple approach for the synthesis of 2,6-diaryl-4-oxo-3,4- dihydropyrimidine-5-carbonitriles
Mendonca Jr., Francisco J. B.,Dos Anjos, Janaina V.,Falcao, Emerson P. S.,De Melo, Sebastiao J.,Srivastava, Rajendra M.
, p. 479 - 484 (2007/10/03)
A concise, facile and straightforward synthesis of 2,6-diaryl-4-oxo-3,4- dihydropyrimidine-5-carbonitriles 12a-h is reported. The reaction for this preparation involves the condensation of ethyl α-cyanocinnamate and its para substituted analogs 8a-e with
An Efficient Knoevenagel Condensation Catalyzed by LaCl3.7H 2O in Heterogeneous Medium
Narsaiah, A. Venkat,Nagaiah
, p. 3825 - 3832 (2007/10/03)
Knoevenagel condensation was carried out in absence of solvent with a mild Lewis acid Lanthanum(III) chloride, to prepare substituted alkenes. A systematic study of the reaction to establish the generality of the method has been undertaken with various aldehydes and active methylene compounds.
Utilisation of 13C N.M.R. Spectroscopy for the Identification of E- and Z-α,β-Unsaturated Esters, Ketones and Nitriles.
Gregory, Barrie,Hinz, Werner,Jones, R. Alan,Arques, Jose Sepulveda
, p. 2801 - 2821 (2007/10/02)
Measurement of 3JCO,H coupling constants provides an unambiguous procedure for the configurational analysis of substituted 2- and 3-arylpropenoic esters and of E- and Z-2-arylbut-2-en-1,4-dioates, even when only one of the isomers is available for analysis.An analogous procedure can also be used for the configurational analysis of 3-arylpropenonitriles and of 4-arylbut-3-en-2-ones.
