2010
DOI: 10.3184/030823410x12798039968476
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Aza-Michael Addition of Acrylonitrile with 2-Aryloxymethylbenzimidazole Derivatives under Microwave Irradiation

Abstract: A simple, rapid, and highly efficient method has been developed for the aza-Michael addition of acrylonitrile to 2-aryl-oxymethylbenzimidazole derivatives in the presence of anhydrous potassium carbonate under microwave irradiation. A series novel of 1-cyanoethyl-2-aryloxymethylbenzimidazole derivatives have been prepared and characterised by 1 H NMR, 13 C NMR, IR spectra and elemental analysis.

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Cited by 9 publications
(4 citation statements)
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“…The solid precipitate was collected, washed with water, dried and recrystallised by ethanol to afford the desired product 3. 5.08 (d, 1H, H a , J = 2.0Hz), 7.14-7.17 (m, 1H, aromatic), 7.20-7.23 (m, 2H, aromatic), 7.27-7.30 (m, 2H, aromatic), 7.40-7.44 (m, 3H, aromatic), 7.54 (d, 2H, aromatic, J = 7.5Hz), 7.67 (d, 2H, aromatic, J = 9.0Hz), 7.79 (d, 2H, aromatic, J = 9.0Hz), 8.04 (d, 2H, aromatic, J = 9.0Hz), 8.34 (d, 2H, aromatic, J = 8.5Hz). 13 C NMR (500MHz CDCl 3 ) δ = 40.18, 45.68, 46.69, 49.69, 51.05, 74.36, 112.79 (CN), 112.83 (CN), 123.95, 124.45, 128.10, 128.33, 128.55, 128.84, 130.01, 134.56, 136.54, 140.18, 142.63, 142.65, 148.38, 148. …”
Section: Synthesis Of Highly Substituted Cyclohexanols In Aqueous Medmentioning
confidence: 99%
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“…The solid precipitate was collected, washed with water, dried and recrystallised by ethanol to afford the desired product 3. 5.08 (d, 1H, H a , J = 2.0Hz), 7.14-7.17 (m, 1H, aromatic), 7.20-7.23 (m, 2H, aromatic), 7.27-7.30 (m, 2H, aromatic), 7.40-7.44 (m, 3H, aromatic), 7.54 (d, 2H, aromatic, J = 7.5Hz), 7.67 (d, 2H, aromatic, J = 9.0Hz), 7.79 (d, 2H, aromatic, J = 9.0Hz), 8.04 (d, 2H, aromatic, J = 9.0Hz), 8.34 (d, 2H, aromatic, J = 8.5Hz). 13 C NMR (500MHz CDCl 3 ) δ = 40.18, 45.68, 46.69, 49.69, 51.05, 74.36, 112.79 (CN), 112.83 (CN), 123.95, 124.45, 128.10, 128.33, 128.55, 128.84, 130.01, 134.56, 136.54, 140.18, 142.63, 142.65, 148.38, 148. …”
Section: Synthesis Of Highly Substituted Cyclohexanols In Aqueous Medmentioning
confidence: 99%
“…The Michael addition is an important, highly atom-economical reaction for the formation of C-C bonds, affording complex molecules such as tri-carbonylcompounds, 1,2 nitrogen-containing ketoesters, 3,4 various heterocycle compounds, [5][6][7][8] and alkylated dicarbonyls. 9,10 Many of these products are important organic intermediates in synthetic organic chemistry.…”
mentioning
confidence: 99%
“…Specifically, the aza-Michael addition that was discovered in 1874 is considered one of the most efficient protocols for C-N formation where the amine acts as a Michael donor and the olefin acts as a Michael acceptor to provide an aza-Michael adduct [11,12]. Most classical aza-Michael reactions are usually activated by a strong base or acid, but ultrasound or microwave assisted reactions have been reported as efficient and cleaner 2 of 11 methods for aza-Michael addition [13,14]. Furthermore, the aza-Michael addition was proved to proceed using the Lewis acid catalyzed reaction [15,16] and ionic liquids [17].…”
Section: Introductionmentioning
confidence: 99%
“…Reação aza-Michael catalisada por HCIO4/SiO2 por irradiação micro-ondas.Outra metodologia foi desenvolvida porWei et al (2010) para reações da adição de aza-Michael com acrilonitrilas formando derivados da 2-ariloximetilbenzilmedazol, na presença de carbonato de potássio anidro e por irradiação de micro-ondas, os rendimentos variaram entre 80-93% (Esquema 4.6). Reação aza-Michael catalisada por K2CO3 por irradiação micro-ondas.Chen et al (2012) realizaram uma síntese estereosseletiva do E-Aldoxima utilizando uma reação de aza-Michael seguida de uma adição retro-Michael.…”
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