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.
Visible-Light-Mediated Sulfonylimination of Tertiary Amines with Sulfonylazides Involving C<sub>sp<sup>3</sup></sub>–C<sub>sp<sup>3</sup></sub> Bond Cleavage
作者:Jiao Gui、Haisheng Xie、Huanfeng Jiang、Wei Zeng
DOI:10.1021/acs.orglett.9b00786
日期:2019.4.19
Visible-light-induced cross-coupling of arylsulfonyl azides with tertiaryamines in the presence of Eosin Y at room temperature has been achieved. This transformation features alkyl C–C bond cleavage and provides a green approach to N-sulfonylamidines under mild conditions.
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。
Transition metal- and catalyst-free one-pot green method for the synthesis of <i>N</i>-sulfonyl amidines <i>via</i> direct reaction of sulfonyl azides with amines
synthesis of N-sulfonyl amidines via the direct reaction of tertiary or secondary amines with sulfonyl azides is described. Transition metal- and catalyst-free conditions were used for the synthesis of biologically important N-sulfonyl amidines. Further studies showed that the reaction proceeded via in situ aerobic oxidation of aminesunder reflux conditions.