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 direct and convenient metal-free method to prepare sulfonyl amidines in the presence of aqueous tert-butyl hydroperoxide (T-HYDRO) has been developed. Different tertiary and secondary amines were tested for compatibility with the oxidative conditions and could be coupled with sulfonyl azides to form the corresponding amidines in moderate to good yields.
A new bromoform reaction of tertiary amines with N,N-dibromosulfonamides or NBS/sulfonamides has been developed. A series of amidines were prepared with moderate to good yields via a Csp(3)-Csp(3) bond cleavage.
Photoinduced Cascade Reaction of Tertiary Amines with Sulfonyl Azides: Synthesis of Amidine Derivatives
作者:Rui Ding、Hui Chen、Yan‐Li Xu、Hai‐Tao Tang、Yan‐Yan Chen、Ying‐Ming Pan
DOI:10.1002/adsc.201900359
日期:2019.8.5
A metal‐free cascade reaction of tertiary amines with sulfonylazides promoted by acridinium salts under blue light irradiation was developed and provided amidine derivatives in moderate to good yields. Enamine was generated from tertiary amine via single‐electron transfer promoted by acridinium salts, and the following [3+2] cyclization with sulfonylazide and CH2N2 release afforded the desired products
蓝光下a啶盐促进的叔胺与磺酰叠氮化物的无金属级联反应得到了开发,并以中等至良好的收率提供了derivatives衍生物。a胺盐通过via啶盐促进的单电子转移从叔胺生成烯胺,随后通过磺酰叠氮化物和CH 2 N 2的释放[3 + 2]环化获得所需的产物。