Reactions of Arylaldehydes and N-Sulfonated Imines with Dimethyl Acetylenedicarboxylate Catalyzed by Nitrogen and Phosphine Lewis Bases
作者:Chao-Qun Li、Min Shi
DOI:10.1021/ol0354324
日期:2003.11.1
[reaction: see text] In the reaction of arylaldehydes or N-sulfonated imines (0.5 mmol) with dimethyl acetylenedicarboxylate (DMAD) (0.6 mmol) catalyzed by pyridine or DMAP (20 mol %), we found that (E)-2-aryl-but-2-enedioic acid dimethyl ester 1 or (E)-2-[aryl-(toluene-4-sulfonylimino)methyl]-but-2-enedioic acid dimethyl ester 2 was formed in good yields at 60 degrees C in THF. A plausible mechanism
Novel Pyridine-Catalyzed Reactionof Dimethyl Acetylenedicarboxylate with Aldehydes and<i>N</i>-Tosylimines: Efficient Synthesis of2-Benzoylfumarates and 1-Azadienes
作者:Vijay Nair、A. R. Sreekanth、N. Abhilash、A. T. Biju、B. Rema Devi、Rajeev. S. Menon、Nigam P. Rath、R. Srinivas
DOI:10.1055/s-2003-41000
日期:——
A novel reaction of 1,4-dipolar intermediate 3,generated from pyridine and dimethyl acetylenedicarboxylate, witharomatic aldehydes, resulted in the facile synthesis of 2-benzoylfumaratesvia the elimination of pyridine, whereas with N-tosyliminesas dipolarophiles the reaction afforded highly substituted 1-azadienes.The reaction of pyridine and dimethyl acetylenedicarboxylate withN-substituted isatins, resulted in a novel three component condensation,affording spiropyrido[2,1-b][1,3]oxazinoderivatives in high yields via 1,4-dipolar cycloaddition.
Triphenylphosphine-catalysed one-pot synthesis of γ-butyrolactone derivatives and highly substituted enones via reaction of dimethyl acetylenedicarboxylate and aryl aldehydes
The reaction between dimethyl acetylenedicarboxylate and various aryl aldehydes in the presence of triphenylphosphine leads to unsaturated γ-butyrolactone derivatives and highlysubstituted enones in fairly good yields at room temperature.
A new hybrid catalyst has been developed by incorporating nicotinic acid onto an organomodified silica. The catalyst was applied as a heterogeneous catalyst for the synthesis of benzoyl fumarate. The reactions work well in the presence of 20 wt % of the catalyst at room temperature to produce the desired products in high yield. The catalyst could be recovered and reused without appreciable change in activity. (C) 2013 Elsevier Ltd. All rights reserved.
Poly(4-vinylpyridine-co-ethylvinylbenzene) as heterogeneous reusable catalyst for the synthesis of benzoyl fumarate
作者:Bishwapran Kashyap、Prodeep Phukan
DOI:10.1007/s00706-015-1531-7
日期:2016.4
Poly(4-vinylpyridine-co-ethylvinylbenzene) 25 % cross-linked (with divinylbenzene) has been found to be an effective heterogeneous catalyst for the synthesis of benzoyl fumarate from aldehyde and dimethyl acetylenedicarboxylate. Various aromatic aldehydes undergo this reaction with good yield in presence of 15 wt% of the catalyst. The catalyst was recovered and reused six times without appreciable alteration in activity.