Vinyltriphenylphosphonium salt mediated synthesis of functionalized coumarins
作者:Issa Yavari、Mehdi Adib、Leila Hojabri
DOI:10.1016/s0040-4020(01)00703-7
日期:2001.8
produced in the reaction between triphenylphosphine and dimethyl acetylenedicarboxylate by hydroquinone, resorcinol, catechol or pyrogallol leads to vinylphosphonium salts, which undergo Michael addition with the conjugate base of the hydroxy acid to produce highly functionalized 2-oxo-2H-chromene derivatives in good yields.
hydrophobic site of beta-lactoglobulin and stabilize a particular protein conformation through the formation of hydrogen bond and hydrophobic interactions. Thus a properly designed compound can inhibit protein–protein interactions through protein–small molecule interactions. Other coumarinoid compounds also are effective in the prevention of thermal aggregation of β-lg.
v. Pechmann; Graeger, Chemische Berichte, 1901, vol. 34, p. 384
作者:v. Pechmann、Graeger
DOI:——
日期:——
A Novel Method for the Synthesisof Oxazolocoumarin Derivatives
作者:Essam Abdelghani、Ali Abd El-Aal、Wesam Shehab、Medhat El-Mobayed
DOI:10.1055/s-2003-40208
日期:——
acetonitrile-lithium perchlorate at constant potential between 1.70-1.80 V (vs. Ag/10 - 2 M Ag + ) using an undivided cell and platinium gauze electrodes leadsto the formation of the corresponding oxazolocoumarin derivatives 2 and/or 3 according to the position of the second OH group in the benzene ring of the coumarin derivatives le,f. The formation of these oxidation products is discussed.
7-羟基香豆素衍生物 1a-fin 无水乙腈-高氯酸锂在 1.70-1.80 V (vs. Ag/10 - 2 M Ag + ) 之间的恒定电位下使用未分裂的电池和铂网电极进行阳极氧化导致形成相应的恶唑香豆素根据香豆素衍生物 le、f 的苯环中第二个 OH 基团的位置,得到衍生物 2 和/或 3。讨论了这些氧化产物的形成。