通过4-羟基香豆素的威廉姆森反应,合成了2,3-二甲基-4 H-呋喃[3,2- c ]香豆素和3-苯基-4 H-呋喃[3,2- c ]香豆素,作为角呋喃香豆素。与α-卤代酮,然后环化。进行合成的呋喃香豆素衍生物的光氧化,并分离和表征光产物。评价了2,3-二甲基-4 H-呋喃[3,2- c ]香豆素对DNA的亲和力和抗菌活性,并将其与8-甲氧基补骨脂素(8-MOP)进行了比较。
Selectfluor-Enabled C(sp<sup>3</sup>)–H Alkoxylation of 3-Methylfuranocoumarins
作者:Zengxin Qin、Mengfei Zhao、Kaixin Zhang、Masuo Goto、Kuo-Hsiung Lee、Jizhen Li
DOI:10.1021/acs.joc.1c00776
日期:2021.6.4
A facile and metal-free method for the direct C(sp3)–H bond alkoxylation of 3-methylfuranocoumarins with alcohols has been disclosed. Selectfluor enabled the (hetero)benzylic C–H etherification by tuning the reaction temperature and solvent. Various alcohols were compatible in this transformation with suitable yields. The mechanistic studies revealed that the reaction might undergo the double addition
Microwave-Assisted Synthesis and Antifungal Activities of Polysubstituted Furo[3,2-c]chromen-4-ones and 7,8,9,10-Tetrahydro-6<i>H</i>-benzofuro[3,2-c]chromen-6-ones
An efficient and novel microwave-assisted synthesis of furo[3,2-c]chromen-4-ones and 7,8,9,10-tetrahydro-6H-benzofuro[3,2-c]chromen-6-ones via 4-hydroxycoumarins with alpha-chloroketones or alpha-bromocyclohexanone in the presence of acetic acid (AcOH)/ammonium acetate (NH4OAc) using DMF as solvent under microwave irradiation is described. Systematically, antifungal biological tests showed that most of the compounds exhibited potent antifungal activity against Botrytis cinerea, Collecterichum capsica, Alternaria solani, Gibberella zeae, and Rhizoctorzia solani at the concentration of 50 mu g/mL. The corresponding EC50 values of these analogues have been detected, and compound 4i showed better antifungal activity against tested fungi Botrytis cinerea and Collecterichum capsica than the reference Osthol.