Direct and Efficient Conversion of Tertiary Thioamides to S-2-Oxo Thioesters under Solvent-free Conditions
作者:Hassan Zali Boeini、Aida Khajeh
DOI:10.5012/bkcs.2011.32.4.1201
日期:2011.4.20
A one-pot conversion of tertiary thioamides to S-2-oxo thioesters is reported. Hence, tertiary thioamides were reacted with $\alpha}$-halo ketones or acids under solvent-free conditions to produce the corresponding oxo-thioesters in good to excellent yields.
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.
Nucleophilic sulfur controlled efficient ketothioamide synthesis from tribromomethyl carbinols
作者:Shubham Tiwari、Sandeep Chandrashekharappa、Guddeangadi N. Gururaja
DOI:10.1039/d3ob01416a
日期:——
oxidant-free efficient protocol for synthesizing α-ketothioamides is reported with a broad substrate scope. The presented protocol demonstrates the confined reactivity of amines. The polysulfide derived from elemental sulfur and amines in an aqueous medium drives the pathway toward diverse α-ketothioamides over thioamides. Substrates with different substituent groups were compatible with the presented protocol
Zinc Chloride Catalyzed Ring Opening of N-Arylsulfonyl Aziridines by Thioamides: A New Approach to the Synthesis of Amidines
作者:Hassan Zali-Boeini、Khadijeh Hajibabaei
DOI:10.1055/s-0034-1378376
日期:——
The first zinc chloride catalyzed ring opening of N-arylsulfonyl aziridines by thioamides is described. Various thioamides were reacted with N-arylsulfonyl aziridines in the presence of a catalytic amount of dry zinc chloride to provide the corresponding N-arylsulfonyl amidine derivatives with 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.