Free radical-mediated alkylation of general alkenes is a challenging and largely unmet goal. Herein, we disclose a conceptually novel "polarity umpolung" strategy for radical alkylation of alkenes using a portfolio of easily-accessed, dual-function alkylating reagents. This is achieved by substituting inherently nucleophilic alkyl radicals with electrophilic sulfone-decorated surrogates, thus inverting
Cu(II)-catalyzed direct thiolation of azoles with thiols is described via intermolecular C–S bond formation/C–H functionalization under oxidative conditions. Both aryl thiols and aliphatic thiols are used as coupling partners, and furnished the thiolation products in moderate to good yields. The reaction is compatible with a wide range of heterocycles including oxazole, thiazole, imidazole and oxadiazole.
Radical Heteroarylalkylation of Alkenes via
<scp>Three‐Component Docking‐Migration</scp>
Thioetherification Cascade
作者:Tao Niu、Jige Liu、Xinxin Wu、Chen Zhu
DOI:10.1002/cjoc.202000088
日期:2020.8
A novel, rational‐designed approach to access various heteroaryl‐substituted alkyl thioethers was developed via docking‐migration cascade process. By utilizing three components involving alkene, dual‐function reagent, and thioetherificating reagent, radical heteroarylalkylation of alkenes followed by thiolation of the alkyl radical intermediates proceeded smoothly, manifesting well compatibility of
Synthesis and reactivity of benzoxa(thia)zol-2-thiones: new route to 2-alkylthiobenzoxa(thia)zoles
作者:Abdallah Harizi、Anis Romdhane、Zine Mighri
DOI:10.1016/s0040-4039(00)00758-9
日期:2000.7
The reaction of aromaticprimaryamines 1 with carbon disulfide in the presence of a catalytic amount of triethylamine followed by treatment with aqueoushydrogenperoxide leads to the corresponding benzoxa(thia)zol-2-thiones 3a–c which can be transformed with iminoethers into 2-alkylthiobenzoxa(thia)zoles 5a–h in good yields (64–85%).