5309-95-5Relevant academic research and scientific papers
Thioamide-Directed Cobalt(III)-Catalyzed Selective Amidation of C(sp3)?H Bonds
Tan, Peng Wen,Mak, Adrian M.,Sullivan, Michael B.,Dixon, Darren J.,Seayad, Jayasree
, p. 16550 - 16554 (2017/12/07)
A mild, oxidant-free, and selective Cp*CoIII-catalyzed amidation of thioamides with robust dioxazolone amidating agents via C(sp3)?H bond activation to generate the desired amidated products is reported. The method is efficient and allows for the C?H amidation of a wide range of functionalized thioamides with aryl-, heteroaryl-, and alkyl-substituted dioxazolones under the Cp*CoIII-catalyzed conditions. The observed regioselectivity towards primary C(sp3)?H activation is supported by computational studies and the cyclometalation is proposed to proceed by means of an external carboxylate-assisted concerted metalation/deprotonation mechanism. The reported method is a rare example of the use of a directing group other than the commonly used pyridine and quinolone classes for Cp*CoIII-catalyzed C(sp3)?H functionalization and the first to exploit thioamides.
1,2,3-Thiadiazoles. I. Synthesis of Sodium (or Potassium) 1,2,3-Thiadiazole-4-thiolates via Thiocarbazonate Esters and N-Acylthiohydrazonate Esters
Lee, Ving J.,Curran, William V.,Fields, Thomas F.,Learn, Keith
, p. 1873 - 1891 (2007/10/02)
A general synthesis of 1,2,3-thiadiazole-4-thiolates 1 and their derivatives 2-3 by an extension of the Hurd-Mori 1,2,3-thiadiazole synthesis is described.Treatment of methyl (or ethyl) hydrazinocarboxylates 11 (thiocarbazonate es
