Effect of Microwave Irradiation on Reaction of Arylaldehyde Derivatives with Some Active Methylene Compounds in Aqueous Media
摘要:
The effect of microwave irradiation on the condensation reactions of arylaldehydes 1 and active methylene compounds 2 in aqueous media was studied and compared with "classical" conditions. The results show that the condensation was carried out only under microwave irradiation in the presence of ammonium chloride as a catalyst, followed by dehydration, to afford (E)-olefins 3. The protocol was used to synthesize coumarins by a condensation reaction of salicylaldehyde or its derivatives with various derivatives of ethylacetate 5 (e.g., (RCH2CO2Et)-C-3; R-3: CO2Et, CO2Me, COMe, CN) in high yields. These investigations will contribute to the development of environmentally friendly and inexpensive processes in organic synthesis.
作者:V. P. Kislyi、V. N. Nesterov、A. M. Shestopalov、V. V. Senfenov
DOI:10.1007/bf02496016
日期:1999.6
The reactions of 4-hydroxy-6-methyl-2-pyrone and 4-hydroxycoumarin with arylidenenitroacetonitriles result in 2-amino-3-nitropyrano[3,2-c]pyrans and 2-amino-3-nitropyrano[3,2-c]chromenes, respectively. The crystal and molecular structure of one of the compounds obtained was determined by X-ray diffraction analysis.
METCHKOV, T.;DEMIREVA, L., Z. CHEM., 1985, 25, N 5, 169-170
作者:METCHKOV, T.、DEMIREVA, L.
DOI:——
日期:——
METCHKOV T. D.; DEMIREVA Z. I.; PANAYOTOVA T. V., DOKL. BOLG. AN, 39,(1986) N 6, 51-53
作者:METCHKOV T. D.、 DEMIREVA Z. I.、 PANAYOTOVA T. V.
DOI:——
日期:——
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作者:MECHKOV TS. D.、 TONCHEVA E. K.、 DEMIREVA Z. I.
DOI:——
日期:——
Amberlite IRA900F as a Solid Fluoride Source for a Variety of Organic Transformations under Solvent-Free Conditions
We have reported that AmberliteIRA900F (Amb-F) is an efficient metal-free catalyst for the activation of Si–N and Si–O bonds and a mild base in a variety of organictransformationsundersolvent-freeconditions, such as the addition of TMSN3 to (E)-2-aryl-1-cyano-1-nitroethenes, nitriles, α,β-unsaturated acids and their esters, and the addition of dimethylsilylketene acetal and ethyl nitroacetate