Palladium-catalyzed intermolecular transthioetherification of aryl halides with thioethers and thioesters
作者:Yahui Li、Gao Bao、Xiao-Feng Wu
DOI:10.1039/c9sc05532k
日期:——
Functional group transfer reactions are an important synthetic tool in modern organic synthesis. Herein, we developed a new palladium-catalyzed intermolecular transthioetherification reaction of arylhalides with thioethers and thioesters. The synthetic utility and practicality of this catalytic protocol are demonstrated in a wide range of successful transformations (>70 examples). This catalytic protocol
The selective addition of organomagnesium reagents to 2,4,6‐trichlorophenyl isocyanide leading to magnesiated aldimines is reported. These aldimines react with Weinreb amides, ketones, or carbonates to provide the corresponding carbonyl derivatives after acidic cleavage. This allows for an efficient synthesis of 1,2‐dicarbonyl compounds and α‐hydroxy ketones.
Simple Procedures for the Hydrolysis of Trimethyl Trithioorthocarboxylates to Methyl Thiolcarboxylates. A Convenient Route to Electron-Rich Aromatic and Heteroaromatic Methyl Thiolcarboxylates
Trimethyl trithioorthocarboxylates of N,N-dialkylarylamines, pyrroles and indoles were easily converted into the corresponding methyl thiolcarboxylates by partial hydrolysis with DMSO/water (4:1), at 130°C for 5-100 h or with DMSO/35% aqueous tetrafluoroboric acid (4: 1), at 80-130°C for 20 min - 4 h in excellent yields (86-98% and 82-99%, respectively).
Thioesters were efficiently prepared via the direct reaction of tertiary thioamides and alkyl halides in water, and in the presence of catalytic amounts of NaI, hexadecyltrimethylammonium bromide (HTAB), and 1,4-diazabicyclo[2.2.2]octane (DABCO). Hence, thioamides smoothly undergo an S-alkylation with alkyl halides in aqueous media following by hydrolysis to afford the corresponding thioesters in very good to excellent yields.
Solvent-Free Conversion of Thioamides to Thioesters
作者:Hassan Zali Boeini、Abbas Zali
DOI:10.1080/00397911.2010.503001
日期:2011.8.15
[image omitted] Diverse thioesters were efficiently prepared via the solvent-free reaction of thioamide derivatives with alkyl halides in the presence of catalytic amounts of 1,4-diazabicyclo[2.2.2]octane (DABCO) in small quantities of water and in good to excellent yields.