Harnessing the catalytic behaviour of 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP): An expeditious synthesis of thioesters
作者:Pallavi Singh、Rama Krishna Peddinti
DOI:10.1016/j.tetlet.2017.04.004
日期:2017.5
promoting the thiocarbonylation of acyl halides and thiols is disclosed. HFIP was recovered with ease and reused for further reactions without any loss of reactivity. Both aryl and alkylthiols bearing electron-donating and electron-withdrawing groups as well as aryl- and alkyl acyl halides worked well in this reaction. Inexpensive precursors, short reaction time, obviating workup, high atom economy, and
Reusable and efficient polyvinylpolypyrrolidone-supported triflic acid catalyst for acylation of alcohols, phenols, amines, and thiols under solvent-free conditions
prepared and fully characterized by FT-IR, TGA, and SEM. This super acidic solid catalyst shows high catalytic activity for selective acylation of alcohols, phenols, amines, and thiols with anhydrides undersolvent-freeconditions at room temperature. In addition, this method features an easy to handle solid super acid catalyst and an operationally simple procedure, affording the desired acylated products
eco-friendly protocol for the chemoselective protection of benzylic and primary and less hindered secondary aliphatic alcohols and phenols as trimethylsilyl ethers and different types of amines as N-tert-butylcarbamates is developed using rice husk (RiH) as the catalyst. This reagent is also able to catalyze the acetylation of alcohols, phenols, thiols and amines with acetic anhydride. Easy work-up, relatively
Solvent-Free Acetylation of Thiols Under Catalysis of MgBr<sub>2</sub>·OEt<sub>2</sub>
作者:Mohammad M. Mojtahedi、M. Saeed Abaee、Mashal Javadpour
DOI:10.1080/10426501003645878
日期:2010.10.28
Solvent-free protection of aromatic and aliphatic thiols with acetic anhydride was performed at room temperature under trace quantities of magnesium bromide ethyletherate, affording rapid formation of various thiol esters in excellent yields.
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