A C(sp3)–H peroxidation of 3-substitutedindolin-2-ones through radical coupling reaction has been developed under metal-free conditions. Using tert-butyl hydroperoxide both as an oxidant and as a peroxidation reagent to couple with the C(sp3)–H bonds of 3-substitutedindolin-2-ones can form a new C–O bond without using any additives. This simple strategy provides a green and efficient approach to
Sn-Catalyzed Criegee-Type Rearrangement of Peroxyoxindoles Enabled by Catalytic Dual Activation of Esters and Peroxides
作者:Moreshwar B. Chaudhari、Krishna Jayan、Boopathy Gnanaprakasam
DOI:10.1021/acs.joc.9b03160
日期:2020.3.6
conversion of tert-butyl peroxy compounds into peresters with the aid of external esters, which then underwent the ring-expansion process, and the incipient carbocation was trapped with the alcohol residue generated from the esters. The reaction is also demonstrated in a continuous flow process to afford the rearranged product in 22 min of residence time.
Indium Catalyzed Sequential Regioselective Remote C−H Indolylation and Rearrangement Reaction of Peroxyoxindole
作者:Moseen A. Shaikh、Akash S. Ubale、Boopathy Gnanaprakasam
DOI:10.1002/adsc.202100793
日期:2021.11.9
peroxyoxindole derivatives undergoes consecutive skeletal rearrangement to generate transient carbocation, which has been trapped with indole nucleophile to generate 2-(1H-indol-3-yl)-4-alkyl-benzo[b][1,4]oxazin-3(4H)-one derivatives. In contrast with Indium (III) Chloride, FeCl3 ⋅ 6H2O facilitates oxidative cleavage of the peroxyoxindole (Hock cleavage) and further reaction with indole to afford biologically
synthesis of heterodifunctional indolederivatives is developed through TBHP/KI-mediated oxidativecoupling. The reaction constructs C–O and C–C bonds in succession with the help of tert-butyl peroxy radicals generated by the TBHP/KI catalytic system, enabling the direct realization of the heterodifunctionalization of indole in one pot. The product of this reaction is a novel heterodifunctional compound
Cobalt-Catalyzed Peroxidation of 2-Oxindoles with Hydroperoxides
作者:De-Long Kong、Liang Cheng、Tao Yue、Hong-Ru Wu、Wei-Chun Feng、Dong Wang、Li Liu
DOI:10.1021/acs.joc.6b00622
日期:2016.7.1
A highly efficient and facile cobalt-catalyzed C–H activation and peroxidation of 2-oxindoles was reported, which provides a new pathway for the synthesis of biologically active 3-peroxy-2-oxindoles from readily available starting materials in excellent chemical yields. The resulting products could be further transformed into various substituted 3-peroxyoxindoles in good to excellent yields. The developed