Rapid and efficient synthesis of formamidines in a catalyst-free and solvent-free system
作者:Zitong Zhou、Yu Zhao、Donghua Zhou、Li Li、Hui Luo、Liao Cui、Weiguang Yang
DOI:10.1039/d1ra06809a
日期:——
An operationally rapid and efficientsynthesis of N-sulfonyl formamidines that proceeds under mild conditions was achieved by reaction of a mixture of an amine, a sulfonyl azide, and a terminal ynone under catalyst-free and solvent-free conditions. Terminal ynones provide the C source to formamidines via complete cleavage of CC.
通过胺、磺酰叠氮化物和末端炔酮的混合物在无催化剂和无溶剂条件下反应,实现了在温和条件下进行的N-磺酰基甲脒的可操作快速且有效的合成。末端 ynones通过完全裂解 C C为甲脒提供 C 源。
Copper-Catalyzed Coupling of Sulfonamides with Alkylamines: Synthesis of (<i>E</i>)-<i>N</i>-Sulfonylformamidines
Herein, we describe an efficient copper-catalyzed coupling of sulfonamides with alkylamines to synthesize (E)-N-sulfonylformamidines. The reaction is accomplished under mild conditions without the use of a corrosive acid or base as an additive. It tolerates a broad scope of substrates and generates the products with exclusive (E)-stereoselectivity.
In Situ Formation of Vilsmeier Reagents Mediated by Oxalyl Chloride: a Tool for the Selective Synthesis of<i>N</i>-Sulfonylformamidines
作者:Martin Gazvoda、Marijan Kočevar、Slovenko Polanc
DOI:10.1002/ejoc.201300402
日期:2013.8
N-Sulfonylformamidines were produced from sulfonamides or N-acylated sulfonamides using Vilsmeier reagent obtained in situ from N,N-disubstituted formamides and oxalyl chloride. Optically active substrates did not racemize during the process. The efficient and mild cleavage of N-sulfonylformamidines can be achieved with hydrazine hydrate in ethanol. The entire procedure constitutes a simple method