computational investigation on sulfonyl amidine formation from thioamides and sulfonylazides is described. The data support a non-concerted two-step pathway for the coupling reaction and also indicate that dipole moment of thioamide and electrophilicity of sulfonylazide would be significant factors for the reaction efficiency. A simple reactivity prediction of the coupling reaction was demonstrated by preliminary
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.
nondirected amidation reaction of aromatic C–H bond was developed under iron(II) catalysis, using sulfonyl azides as the nitrogen source. The reaction displayed a broad substrate scope and good regioselectivities in the aspects of aromatic ring vs alkyl chain and different aromatic position of (alkyl)arenes. This method provided a new protocol for the synthesis of some aromatic amines, which were hard
Regioselective ringexpansion of alkynyl cyclopropanes to highly substituted cyclobutenes was developed. The reactioninvolves a copper-catalyzed cycloaddition of an alkyne with an arylsulfonyl azide and a silver-catalyzed carbene formation followed by ringexpansion of a cyclopropyl carbene intermediate.
The synthesis of sulfonylguanidines from N,N,N',N'-tetramethylthiourea and sulfonyl azides is described. This method serves as an alternative route for generating sulfonylguanidines via the use of stable starting materials.