Conversion of thioamides and N 2-acyl-N 1-methyl-N 1-thioacylhydrazines into amides and N 1 N 2-diacyl-N 1-methylhydrazines by trimethyloxonium fluoroborate
Reactions of Hexadehydro-Diels–Alder (HDDA)-Derived Benzynes with Thioamides: Synthesis of Dihydrobenzothiazino-Heterocyclics
作者:Vignesh Palani、Junhua Chen、Thomas R. Hoye
DOI:10.1021/acs.orglett.6b03199
日期:2016.12.16
Reaction of thioamides (e.g., II) with benzynes generated by the hexadehydro-Diels–Alder (HDDA) cycloisomerization (e.g., I) produces dihydrobenzothiazines (e.g., III). It is postulated that the reaction proceeds via benzothietene (cf. IV) and o-thiolatoaryliminium (cf. V) intermediates and that the latter undergoes intramolecular 1,3-hydrogen atom migration to produce the penultimate isomeric iminium
Rapid and efficient protocol for Willgerodt–Kindler’s thioacetamides catalyzed by sulfated polyborate
作者:Deelip S. Rekunge、Chetan K. Khatri、Ganesh U. Chaturbhuj
DOI:10.1007/s00706-017-2013-x
日期:2017.12
AbstractA simple and efficient method for the synthesis of one-pot, three-component thioacetamides via Willgerodt–Kindler reaction was developed using a sulfated polyborate catalyst. The method described the reaction of ketones, sulfur, and secondary amines with high yields under a solvent-free condition at 100 °C. The key advantages of the present method are short reaction time, high yields, solvent-free
Thio-Michael addition of thioamides and allenes for the selective construction of polysubstituted 2-arylthiophenes <i>via</i> TBAI/H<sub>2</sub>O<sub>2</sub> promoted tandem oxidative annulation and 1,2-sulfur migration
作者:Teng Han、Xiaoyan Luo
DOI:10.1039/c8ob01835a
日期:——
addition/oxidativeannulation of allenes and thioamides for the construction of polysubstituted 2-arylthiophenes under a sulfur migration transformation protocol has been developed. The transition-metal-free protocol achieves the oxidative cyclization reaction of thioamides containing electron-rich substituents with allenes to construct polysubstituted thiophenes selectively by controlling oxidation conditions