Regioselective Cross-Couplings of Coumarins and Flavones with Ethers via C(sp<sup>3</sup>)–H Functionalization
作者:Ben Niu、Wannian Zhao、Yingcai Ding、Zhaogang Bian、Charles U. Pittman、Aihua Zhou、Haibo Ge
DOI:10.1021/acs.joc.5b00800
日期:2015.7.17
Coumarin and flavone derivatives are highly valuable molecules in drug discovery. Here, two new regioselective cross-dehydrogenation couplings of coumarins and flavones with different ethers via C(sp3)–H functionalization processes were developed, generating new ether-substituted derivatives not previously reported. These reactions proceeded well via radical mechanisms and provided the corresponding
The present invention relates to compounds of the general formula (1) wherein the variables are defined as given in the description and claims. The invention further relates to uses of and to, processes and intermediates related to compounds of the general formula (I), wherein Q is wherein the substituents of I, Ia and Ib are as defined in description and claims.
A novel ammonium iodide-induced sulfenylation method of flavones, indole and arylimidazo[1,2-a]pyridines using stable and odorless sodium benzenesulfinates as sulfur sources was developed, generating regioselective derivatives in good yields.
Regioselective C−S Bond Formation between Flavones and Arylsulfonyl Chlorides through the Use of Ammonium Iodide
作者:Wannian Zhao、Aihua Zhou
DOI:10.1002/cctc.201500673
日期:2015.11
mediated C−Sbondformation protocol involving flavones and sulfonyl chlorides to generate different ArS‐substituted flavone derivatives in high yields was developed. Different from existing metal‐free C−Sbondformation protocols with the use of PPh3 or I2 as the catalyst, this method provides an alternative way of constructing C−S bonds through the use of NH4I as a catalyst, which makes it highly valuable