Hydrogen Peroxide-Mediated Rapid Room Temperature Metal-Free C(sp<sup>2</sup>)-H Thiocyanation of Amino Pyrazoles, Amino Uracils, and Enamines
作者:Danish Ali、Anoop Kumar Panday、Lokman H. Choudhury
DOI:10.1021/acs.joc.0c01738
日期:2020.11.6
aminopyrazoles, aminoisoxazole, aminoisothiazole, amino uracils, and aliphatic enamines has been developed in an aqueous medium using hydrogenperoxide as a benign oxidant and ammonium thiocyanate as a thiocyanating agent. On the otherhand, the reaction of hydrogenperoxide and ammonium thiocyanate followed by one-pot addition of NaOH provides the corresponding disulfides in the case of amino azoles, and
Copper-Catalyzed Regioselective Direct C-H Thiolation and Thiocyanation of Uracils
作者:Medena Noikham、Sirilata Yotphan
DOI:10.1002/ejoc.201900343
日期:2019.4.30
The copper‐catalyzed directC–H thiolation and thiocyanation of uracils using disulfides and thiocyanate salts respectively as coupling partners have been successfully developed. These protocols enable the C–H bond cleavage and C–S bond formation to proceed efficiently, providing useful methods to access of a diverse array of thio‐substituted at the 5 position of uracil derivatives in good to excellent
An electrochemical method for the C(sp2)−H thiocyanation of pyrazol-5-amines and enamines were developed in an undivided cell. A variety of thiocyanated pyrazol-5-amine and enamine derivatives were accessed in 36–91% yields, employing thiocyanate salts as electrolyte and thiocyanating reagent. Moreover, this electrochemical protocol can be extended to the synthesis of various iodinated and brominated
Iodine mediated an efficient and greener thiocyanation of aminopyrimidines by a modification of the Kaufmann’s reaction
作者:Ricaurte Rodríguez、Patricia Camargo、César A. Sierra、Carlos Y. Soto、Justo Cobo、Manuel Nogueras
DOI:10.1016/j.tetlet.2011.03.058
日期:2011.5
A new, safe, and efficient methodology for the thiocyanation of some aminopyrimidine derivatives has been implemented. The thiocyanation reactions proceeded at room temperature with high yields and selectivity. This route is a less toxic alternative to other common thiocyanation techniques because it uses molecular iodine as a halogen source, which is less reactive and easier to handle than chlorine or bromine. (C) 2011 Elsevier Ltd. All rights reserved.