Herein, the rhodium(II)-catalyzed cyclopropanation reaction of pinacol allylboronate with N-sulfonyl-1,2,3-triazoles is reported. Boryl-substituted cyclopropylmethanamines are produced in a highly diastereo- and enantioselective manner. Various cyclopropylmethanamines containing a quaternary stereocenter are derivedfrom them.
Generation of Functionalized Azepinone Derivatives via a (4 + 3)-Cycloaddition of Vinyl Ketenes and α-Imino Carbenes Derived from <i>N</i>-Sulfonyl-triazoles
作者:Harrison M. Hill、Zachary D. Tucker、Kevin X. Rodriguez、Katelyn A. Wendt、Brandon L. Ashfeld
DOI:10.1021/acs.joc.1c03002
日期:2022.3.4
3)-cycloaddition between vinyl ketenes and N-sulfonyl-1,2,3-triazoles for the construction of azepinone products is described. Employing vinyl ketenes as a 1,4-dipolar surrogate, instead of the more commonly used dienyl moieties, allows for the intermolecular and selective formation of azepinone products over a potential (3 + 2)-cycloadduct under mild reaction conditions allows for the generation of azepinone products
A rhodium-catalyzed reaction of formamides with N-sulfonyl-1,2,3-triazoles is developed to formulate a new one-pot procedure for the direct synthesis of a-amino enaminones from terminal alkynes.
Rhodium-Catalyzed Intermolecular C–H Functionalization as a Key Step in the Synthesis of Complex Stereodefined β-Arylpyrrolidines
作者:Robert W. Kubiak、Huw M. L. Davies
DOI:10.1021/acs.orglett.8b01362
日期:2018.7.6
The synthesis of beta-arylpyrrolidines via a catalytic enantioselective intermolecular allylic C(sp)(3)-H functionalization of trans-alkenes followed by immediate reduction, ozonolysis, and then in situ diversification of the resulting cyclic hemiaminal to furnish highly substituted, stereoenriched beta-arylpyrrolidines is reported. This methodology utilizes 4-aryl-1-sulfony1-1,2,3-triazoles as carbene precursors and the dirhodium tetracarboxylate catalyst Rh-2(S-NTTL)(4). A variety of beta-arylpyrrolidines were prepared in good yields with high levels of diastereo- and enantioselectivity over four linear steps, requiring only a single purification procedure.