Eleven 3-substituted isocoumarins and a benzylidenephthalide were synthesized through thermal cyclization reaction of δ- and γ-ketoamides, respectively. Subsequent deprotection of the hydroxyl groups of the resulting isocoumarin and benzylidenephthalide compounds afforded thunberginols A, B, and F, respectively, which originated from the processed leaves of Hydrangea macrophylla SERINGE var. thunbergii MAKINO. The synthesized isocoumarins and thunberginols were evaluated for their anti-allergic activity, in which thunberginol B exhibited the highest inhibitory potency on the degranulation of RBL-2H3 cells induced by antigen. Structure–activity relationship studies were carried out to determine the necessary substituents on the 3-phenylisocoumarin skeleton for inhibitory activity.
合成了十一种3-取代异香豆素和一个苄叉邻苯二甲酸酯,这些化合物分别通过δ-和γ-酮酰胺的热环化反应得到。随后的去保护反应使得所得的异香豆素和苄叉邻苯二甲酸酯化合物分别获得了来自紫阳花(Hydrangea macrophylla SERINGE var. thunbergii MAKINO)加工叶子的thunberginols A、B和F。合成的异香豆素和thunberginols被评估其抗过敏活性,其中thunberginol B对抗原诱导的RBL-2H3细胞去颗粒化展现了最高的抑制效力。进行了结构—活性关系研究,以确定3-苯基异香豆素骨架上抑制活性所需的取代基。
Synthesis of 3-substituted isocoumarins and related natural products.
Several N, N-diethyl-2-acylmethylbenzamides (6) were prepared from N, N-diethyl-2-toluamides (4), and the ketoamides (6) were easily cyclized to the corresponding 3-substituted isocoumarins (8) by heating in acetic acid or xylene. This simple procedure was applied to the synthesis of thunberginol A (1), thunberginol B (2), thunberginol F (14), and a key-intermediate (8j) for achlisocoumarin I (3).
Design, Synthesis, and Pharmacological Evaluation of <i>N</i>-Acylhydrazones and Novel Conformationally Constrained Compounds as Selective and Potent Orally Active Phosphodiesterase-4 Inhibitors
作者:Arthur E. Kümmerle、Martine Schmitt、Suzana V. S. Cardozo、Claire Lugnier、Pascal Villa、Alexandra B. Lopes、Nelilma C. Romeiro、Hélène Justiniano、Marco A. Martins、Carlos A. M. Fraga、Jean-Jacques Bourguignon、Eliezer J. Barreiro
DOI:10.1021/jm300514y
日期:2012.9.13
N-acylhydrazones (NAHs), the compound 8a was selected as a selective submicromolar phosphodiesterase-4 (PDE4) inhibitor associated with anti-TNF-α properties measured both in vitro and in vivo. The recognition pattern of compound 8a was elucidated through molecular modeling studies based on the knowledge of the 3D-structure of zardaverine, a PDE4 inhibitor resembling the structure of 8a, cocrystallized with
Regioselective cyclization of 2-alkynylbenzoic acid in water for the synthesis of isocoumarin
作者:Yan-Hua Wang、Guanyinsheng Qiu、Hongwei Zhou、Wenlin Xie、Jin-Biao Liu
DOI:10.1016/j.tet.2019.06.012
日期:2019.7
In this work, a regioselectivesynthesis of isocoumarins from 2-alkynylbenzoic acid is reported. The transformations proceed smoothly with good yields in water via a metal-free radical pathway. When catalytic TBAB is employed, the reaction provides various isocoumarin derivatives according to the structures of the corresponding precursors. It is believed that TBAB serves as a phase transfer catalyst
Direct Synthesis of 3‐Aryl Substituted Isocoumarins and Phthalides through Palladium Acetate Catalyzed C(
<i>sp</i>
<sup>
<i>2</i>
</sup>
)−H Activation in Ionic Liquids
phthalides is presented. The reaction is carried out in molten tetrabutylammonium acetate (ionicliquid) which allows the use of an amount of palladium acetate from ten to twenty times lower than that of similar protocols in molecularsolvents (0.5 % mol). Oxygen is used as a reoxidant for the metal, mediated by copper acetate.