Transition-metal free 2-arylbenzoxazole formation from aryl amides and cyclohexanones
作者:Xiangxiang Cao、Xiufang Cheng、Yang Bai、Saiwen Liu、Guo-Jun Deng
DOI:10.1039/c4gc01572j
日期:——
A transition-metal-free method for the synthesis of 2-arylbenzoxazoles from readily available cyclohexanones and benzamides is described. The combined use of KI, p-TsOH and DMSO significantly improved the reaction yields. Non-aromatic cyclohexanones were smoothly dehydrogenated and acted as the aryl source using oxygen as the oxidant.
Enantioselective Radical Trifluoromethylation of Benzylic C–H Bonds via Cooperative Photoredox and Copper Catalysis
作者:Pin Xu、Wenzheng Fan、Pinhong Chen、Guosheng Liu
DOI:10.1021/jacs.2c06432
日期:2022.8.3
The first enantioselectiveradical trifluoromethylation of benzylicC–Hbonds has been established by a cooperative photoredox and copper catalysis system, providing straightforward access to structurally diverse benzylic trifluoromethylation products in good yields with excellent enantioselectivities under mild conditions. Our method features a broad substrate scope and excellent functional group
We describe an efficient method for benzylicC–Hfluorination via sequential hydrogen-atom transfer (HAT) and oxidative radical-polar crossover utilizing the Ag(I)/Selectfluor system. Amide ligands, such as benzamide and sulfonamide, substantially facilitate the processes leading to a carbocation intermediate, which subsequently reacts with nucleophilic fluorinating reagent to form a C–F bond. This
employing potassium persulfate as an oxidant at room temperature has been disclosed. The protocol tolerated a variety of primary, secondary, and tertiary alcohol nucleophiles, affording corresponding benzylethers up to 80 % yields. This method shows good site selectivity and broad functional group tolerance. Mechanistic study indicates this strategy undergoes a single electron transfer process.
MEDICAMENT FOR SUPPRESSING MALIGNANT TUMOR METASTASIS
申请人:NATIONAL CEREBRAL AND CARDIOVASCULAR CENTER
公开号:US20170014419A1
公开(公告)日:2017-01-19
Provided are a novel medicament for suppressing or preventing the metastasis of a malignant tumor such as carcinoma, a novel treatment or prevention method for suppressing or preventing the metastasis of a malignant tumor, etc. The medicament comprises a non-peptidic angiotensin type 2 receptor agonist as an active ingredient. In the medicament, the non-peptidic angiotensin type 2 receptor agonist may be, for example, a sulfonyl malonamide compound. The medicament may be a medicament for use in combination with an anticancer agent and/or an antitumor agent.