Three-component synthesis of N-sulfonylformamidines in the presence of magnetic cellulose supported N-heterocyclic carbene-copper complex, as an efficient heterogeneous nanocatalyst
作者:Salman Shojaei、Zarrin Ghasemi、Aziz Shahrisa
DOI:10.1016/j.tetlet.2017.08.075
日期:2017.10
A cellulose based magnetic nanocomposite possessing NHC-Cu Complex has been synthesized and characterized. It was then applied as a highly active catalyst in one-pot three-component reaction of sulfonyl azides, secondary amines and triethylamine to afford N-sulfonylformamidines. Copper catalyzed oxidative transformation of C-N bond of triethylamine is a key step to give desired products. In contrast
A straightforward one-pot, multicomponent approach was developed to synthesize di- and tri-substituted N-sulfonyl formamidines from sulfonyl chlorides, NaN3, ethyl propiolate, and primary/secondary amines under mild conditions without catalysts or additives. Structural analysis of the di-substituted sulfonyl formamidines indicated formation of the E-syn/anti isomeric form. Tri-substituted analogues
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
Electrochemically generated <i>N</i>-iodoaminium species as key intermediates for selective methyl sulphonylimination of tertiary amines
作者:Binbin Huang、Chao Yang、Jia Zhou、Wujiong Xia
DOI:10.1039/c9cc09869k
日期:——
This study presents a straightforward protocol for approaching N-sulphonylamidines via an electricity-driven, iodine-mediated cross dehydrogenative condensation (CDC) between sulphonamides and tertiary amines.