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.
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.
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.