Synthesis of [5,6]-fused pyridocoumarins through aza-Claisen rearrangement of 6-propargylaminocoumarins
摘要:
[5,6]-Fused pyridocoumarins are prepared through aza-Claisen rearrangement and subsequent in situ cyclization of 6-propargylaminocoumarins under microwave irradiation in the presence of boron trifluoride diethyl etherate in N,N-dimethylformamide. During this process demethoxycarbonylation is observed in the corresponding 4-carbomethoxycoumarin derivatives. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis of [5,6]-fused pyridocoumarins through aza-Claisen rearrangement of 6-propargylaminocoumarins
摘要:
[5,6]-Fused pyridocoumarins are prepared through aza-Claisen rearrangement and subsequent in situ cyclization of 6-propargylaminocoumarins under microwave irradiation in the presence of boron trifluoride diethyl etherate in N,N-dimethylformamide. During this process demethoxycarbonylation is observed in the corresponding 4-carbomethoxycoumarin derivatives. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis and anti-inflammatory evaluation of novel angularly or linearly fused coumarins
作者:Theodoros Symeonidis、Konstantina C. Fylaktakidou、Dimitra J. Hadjipavlou-Litina、Konstantinos E. Litinas
DOI:10.1016/j.ejmech.2009.09.004
日期:2009.12
Angular [7,8]-fused coumarins were obtained from the reaction of [2,3]-fused phenols with DMAD and PPh3, while linear [6,7]-fused coumarins were formed from the analogous reaction of [3,4]-fused phenols with DMAD and PPh3. These compounds were tested in vitro for antioxidant activity and they found to present significant scavenging activity. In parallel, these new compounds were evaluated in vivo for anti-inflammatory activity and they found to inhibit the carrageenin-induced paw edema (34-65%). Although their interaction with the free stable radical DPPH was low, the methyl 2,2-dimethyl-8-oxo-3,8-dihydro-2H-furo[2,3-h]chromene-6-carboxylate was the most potent (65%) in the in vivo experiment. The later seems to be a potent soybean Lipoxygenase inhibitor and does not acquire gastrointestinal toxicity. (C) 2009 Elsevier Masson SAS. All rights reserved.
Synthesis of [5,6]-fused pyridocoumarins through aza-Claisen rearrangement of 6-propargylaminocoumarins
作者:Theodoros S. Symeonidis、Michael G. Kallitsakis、Konstantinos E. Litinas
DOI:10.1016/j.tetlet.2011.08.012
日期:2011.10
[5,6]-Fused pyridocoumarins are prepared through aza-Claisen rearrangement and subsequent in situ cyclization of 6-propargylaminocoumarins under microwave irradiation in the presence of boron trifluoride diethyl etherate in N,N-dimethylformamide. During this process demethoxycarbonylation is observed in the corresponding 4-carbomethoxycoumarin derivatives. (C) 2011 Elsevier Ltd. All rights reserved.