Thermal [4 + 2] Cycloadditions of 3-Acetyl-, 3-Carbamoyl-, and 3-Ethoxycarbonyl-Coumarins with 2,3-Dimethyl-1,3-butadiene under Solventless Conditions: A Structural Study
摘要:
报告了在无溶剂条件下,3-乙酰基、3-氨基甲酰基和 3-乙氧羰基香豆素与 2,3-二甲基-1,3-丁二烯的热[4+2]环加成反应,以及一些加成物的环氧化反应。根据核磁共振、X 射线和质谱数据,并在 ab initio 理论计算的支持下,重点讨论了 Diels-Alder 加合物及其环氧化物的结构特征。
Synthesis of Coumarin and Homoisoflavonoid Derivatives and Analogs: The Search for New Antifungal Agents
作者:Alana R. Ferreira、Danielle da N. Alves、Ricardo D. de Castro、Yunierkis Perez-Castillo、Damião P. de Sousa
DOI:10.3390/ph15060712
日期:——
homoisoflavonoid cores and structural analogs, were submitted for evaluation of antifungal activity against various species of Candida. The broth microdilution test was used to determine the Minimum Inhibitory Concentration (MIC) of the compounds and to verify the possible antifungal action mechanisms. The synthetic derivatives were obtained using various reaction methods, and six new compounds were obtained. The
A large series of 3-carboxamido-7-substituted cournarins have been synthesized and tested in vitro for their human monoamine oxidase A and B (hMAO-A and hMAO-B) inhibitory activity. Taking into account all the relevant structural information on MAOs reported in the literature, we made some changes in the coumarin nucleus and examined with particular attention the effect on activity and selectivity of substituting at position 3 with N-aryl or N-alkyl carboxamide and at position 7 with a benzyloxy or a 4'-F-benzyloxy group. Some of the assayed compounds proved to be potent, selective inhibitors of hMAO-B with IC50 values in the micromolar range. To better understand the enzyme-inhibitor interaction and to explain the selectivity of the most active compounds toward hMAOs, molecular modeling studies were carried out on new, high resolution, hMAO-A and hMAO-B crystallographic structures.
Das, Asish R.; Medda, Arunima; Singha, Raghunath, Journal of the Indian Chemical Society, 2008, vol. 85, # 11, p. 1124 - 1129