Electrochemical C–H functionalization and subsequent C–S and C–N bond formation: paired electrosynthesis of 3-amino-2-thiocyanato-α,β-unsaturated carbonyl derivatives mediated by bromide ions
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
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
Highly Selective C–N and C–S Dual Functionalization of 1,3-Dicarbonyl Derivatives Using TBHP as an Oxidant
作者:Pooja K. Bagad、Ratanamala S. Darole、G. Rama Krishna、Beeran Senthilkumar
DOI:10.1021/acs.joc.4c00612
日期:2024.7.5
and efficient method for the selective synthesis of (E)-3-amino-2-thiocyanato-α,β-unsaturated carbonyl compounds is described through a given protocol. The present approach features the use of inexpensive ammonium thiocyanate to achieve dual functionalization of 1,3-dicarbonyl compounds using TBHP as an oxidant, providing a rapid and practical route to the selective formation of both C–N and C–S bonds
通过给定的方案描述了一种直接电合成/无光催化剂、原子经济且有效的选择性合成( E )-3-氨基-2-硫氰酸根-α,β-不饱和羰基化合物的方法。本方法的特点是使用廉价的硫氰酸铵,以 TBHP 作为氧化剂实现 1,3-二羰基化合物的双官能化,为通过自由基选择性形成 C-N 和 C-S 键提供了快速实用的途径过程。该方法提供了广泛的底物范围和优异的产率,并允许进一步探索产物以构建杂环化合物和其他功能。