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。
Copper-catalyzed radical/radical cross-coupling of ketoxime carboxylates with 4-hydroxycoumarins: A novel synthesis of furo[3,2-c]-coumarins
作者:Mingchuang He、Zhaohua Yan、Wangyang Wang、Fuyuan Zhu、Sen Lin
DOI:10.1016/j.tetlet.2018.09.007
日期:2018.10
A novel and efficient strategy for the synthesis of furo[3,2-c]coumarins has been developed via copper-catalyzed radical/radical cross-coupling of ketoxime carboxylates with 4-hydroxycoumarins. This redox-neutral reaction allows smooth and selective synthesis of 2-substituted, 3-substituted, 2,3-disubstituted and 2,3-fused polycyclic furo[3,2-c]coumarins.
通过铜催化酮肟肟酸酯与4-羟基香豆素的自由基/自由基交叉偶联,已经开发了一种新型有效的合成呋喃[3,2- c ]香豆素的策略。该氧化还原中性反应允许2-取代,3-取代,2,3-二取代和2,3-稠合的多环呋喃[3,2- c ]香豆素的平滑和选择性合成。
Iodine-mediated formal [3 + 2] annulation for synthesis of furocoumarin from oxime esters
作者:Quyen T. Pham、Phong Q. Le、Ha V. Dang、Hiep Q. Ha、Huong T. D. Nguyen、Thanh Truong、Tri Minh Le
DOI:10.1039/d0ra07566c
日期:——
A novel synthesis of furocoumarins was developed by a reaction between oxime esters and 4-hydroxycoumarins. The reaction was proposed to undergo radical mechanism mediated by iodine, a cheap and common laboratory reagent. Mechanistic studies showed the key for the successful transformation was the presence of α-iodoimine intermediate which facilitated the ring-closing step. The developed conditions
Synthesis of benzofurans from the cyclodehydration of α-phenoxy ketones mediated by Eaton’s reagent
作者:Zhanwei Ma、Min Zhou、Lin Ma、Min Zhang
DOI:10.1177/1747519820907244
日期:2020.7
acid) is used to prepare 3-substituted or 2,3-disubstituted benzofurans with moderate to excellent yields under mild conditions. The method provides a facile access to benzofurans from readily available starting materials such as phenols and α-bromo ketones. The reaction is highly efficient, which is attributed to the good reactivity and fluidity of Eaton’s reagent. The reaction can be applied to prepare
The metal-freesodium persulfate mediateddirect selenylation of arenofurans with diaryl diselenides at roomtemperature was developed, and the products were obtained in high yields. The reaction was found to be applicable to a variety of naphthofurans, benzofurans, and furocoumarins. To the best of our knowledge, this is the first report of the metal-freedirect selenylation of arenofurans. The experimental
Metal-Free Synthesis of Furocoumarins: An Approach via Iodine-Promoted One-Pot Cyclization between 4-Hydroxycoumarins and Acetophenones
作者:Phuc H. Pham、Que T. D. Nguyen、Nhu K. Q. Tran、Vu H. H. Nguyen、Son. H. Doan、Hiep Q. Ha、Thanh Truong、Nam T. S. Phan
DOI:10.1002/ejoc.201800983
日期:2018.8.31
An iodine‐mediated one‐pot synthesis of furocoumarins has been developed. The furocoumarins were obtained in high yields in the presence of NH4OAc as an additive, whereas neither acidic nor basic additives were effective.