Microwave-assisted iodine-catalyzed oxidative coupling of dibenzyl(difurfuryl)disulfides with amines: a rapid and efficient protocol for thioamides
作者:Jinyang Chen、Lan Mei、Jialing Liu、Chuntao Zhong、Binfang Yuan、Qiang Li
DOI:10.1039/c9ra05939c
日期:——
efficient protocol for synthesis of thioamides was developed via the microwave-assisted iodine-catalyzed oxidative coupling of dibenzyl(difurfuryl)disulfides with amines. This process is scalable and tolerates a wide spectrum of amines to deliver the corresponding products in moderate to excellent yields in 10 minutes, providing a cheap and rapid approach to thioamides.
Three-componentreactions involving amines, aldehydes, and elemental sulfur powder are reported to afford thioamides in a simple one-pot procedure in the absence of a catalyst. A variety of thioamides can be obtained in good to excellent yields up to 88 %.
We report for the first time the coupling of activated thioamides with alcohols to efficiently form thionoesters via a palladium-catalyzed C–N cleavage strategy. The new approach employs thioamides as a thioacylating reagent to give thionoesters in moderate to good yields. Notably, this methodology demonstrates a broad substrate scope, as alkyl/aryl alcohols are well tolerated, and this process might
Intramolecular [3+2] cycloadditions of non-stabilised azomethine imidate-methylides
作者:Alex I.D. Alanine、Colin W.G. Fishwick
DOI:10.1016/s0040-4039(00)99384-5
日期:1989.1
Non-stabilised azomethine imidate and thioimidate-methylides, generated via fluoride ion induceddesilylation of N-(trimethylsilyl)methyl-2-alkoxy imminium salts undergo facile intramolecular cycloaddition with unactivated and electron deficient dipolarophiles affording pyrrolo-[2,3-b] furans and pyrans.
Aminolysis of <i>O</i>-Aryl Thionobenzoates: Amine Basicity Combines with Modulation of the Nature of Substituents in the Leaving Group and Thionobenzoate Moiety to Control the Reaction Mechanism
nucleophile and nucleofuge, that is, the reaction proceeds through T(+/-) when the leaving aryloxide is less basic than the attacking amine, but through T(+/-) and T(-) when the leaving group is more basic than the amine. However, the reaction mechanism is not influenced by the electronic nature of the substituent X in the nonleavinggroup. The Hammett plot for the reactions of 2a-f with benzylamine is