An approach to the synthesis of thioesters and selenoesters promoted by Rongalite®
摘要:
Rongalite (R) promotes cleavage of diaryldisulfides generating the corresponding chalcogenolate anions that then undergo facile reaction with N-acylbenzotriazoles in the presence of K(2)CO(3) to afford thioesters in good to excellent yields. The important features of this methodology are no requirement of metal catalysts, without any expensive reagent and high yields. It is noteworthy that the reactions of diphenyl diselenide with N-acylbenzotriazoles are also conducted to afford selenoesters in good yields under the standard conditions.
and cross-interactionconstant ρXZ is relatively large and positive (0.90). These trends are consistent with the rate-limiting breakdown of a tetrahedral intermediate, T ± . The proposed mechanism is also supported by adherence of the rate data to the reactivity-selectivity principle (RSP). The kinetic isotope effects, kH/kD, are greater than unity (1.3-1.4) suggesting a possibility of hydrogen-bonded
One-pot enol silane formation-Mukaiyama aldol reactions: Crossed aldehyde-aldehyde coupling, thioester substrates, and reactions in ester solvents
作者:C. Wade Downey、Grant J. Dixon、Jared A. Ingersoll、Claire N. Fuller、Kenneth W. MacCormac、Anna Takashima、Rohina Sediqui
DOI:10.1016/j.tetlet.2019.151192
日期:2019.10
Trimethylsilyl trifluoromethanesulfonate (TMSOTf) and a trialkylamine base promote both in situ enol silane/silyl ketene acetal formation and Mukaiyama aldol addition reactionsbetween a variety of reaction partners in a single reaction flask. Isolation of the required enol silane or silyl ketene acetal is not necessary. For example, crossed aldolreactionsbetween α-disubstituted aldehydes and non-enolizable
Thioesters as Bifunctional Reagents for 2‐Naphthylamine Sulfuracylation
作者:Fuhong Xiao、Shanshan Yuan、Dahan Wang、Saiwen Liu、Huawen Huang、Guo‐Jun Deng
DOI:10.1002/adsc.201900301
日期:2019.7.11
An efficient and convenient strategy for the preparation of diaryl sulfides via a Fe‐promoted direct sulfuracylation of 2‐naphthylamine using thioesters as bifunctional reagents is described. This synthetic strategy features high chemoselectivity, good substrate scope and functional group tolerance.
Visible-Light-Promoted Thiyl Radical Generation from Sodium Sulfinates: A Radical–Radical Coupling to Thioesters
作者:Ganganna Bogonda、Dilip V. Patil、Hun Young Kim、Kyungsoo Oh
DOI:10.1021/acs.orglett.9b01218
日期:2019.5.17
available starting materials: acid chlorides and sodium sulfinates. The facile generation of acyl radical species under the visible light photoredox conditions allows the formation of thiylradical species from sodium sulfinates via multiple single electron transfer reactions, where the final acyl radical-thiyl radical coupling has been accomplished. The direct radical–radical coupling strategy offers a mild