disclosed. 2,5-Disubstituted pyrroles were selectively obtained in high yield with aryl alkynes and aliphatic alkynes, whereas 2,3,4-trisubstituted pyrroles were formed with silylated alkynes. This switchable method provides a controllable and facile access to both multisubstituted pyrrole scaffolds with high efficiency, excellent regioselectivity, and good functionalgroup compatibility.
Cascade Reactions to Substituted 1H-Pyrrole-3-carbonitriles via Ligand-Free Palladium(II)-Catalyzed C(sp)–C(sp2) Coupling
作者:Guolin Zhang、Yongping Yu、Zijuan Wang、Wenteng Chen、Haofan Luo、Chang He
DOI:10.1055/s-0039-1691731
日期:2020.6
An efficient and simple synthesis of substituted 1H-pyrrole-3-carbonitriles was developed. This reaction is a palladium(II)-catalyzed cascade of C(sp)–C(sp2) coupling followed by intramolecular C–N bond formation. The method can tolerate various substrates with satisfactory yields. Its ligand-free conditions and high efficiency make this method particularly attractive.
Novel preparation of 2,5-diarylpyrroles from aromatic nitriles with 3-arylpropylmagnesium bromides, 1,3-diiodo-5,5-dimethylhydantoin, and BuOK
作者:Momoko Nakamura、Kazuhiro Yoshida、Hideo Togo
DOI:10.1016/j.tet.2022.132709
日期:2022.4
Treatment of aromatic nitriles with 3-arylpropylmagnesium bromides under warming conditions and then water, followed by the reaction with DIH at room temperature under irradiation with a LED lamp and then with tBuOK gave 2,5-diarylpyrroles in moderate yields. The key step of the present method is the formation of N-iodo-2,5-diaryl-4,5-dihydropyrroles by the reaction of the formed imines with DIH, which
New synthesis of unsymmetrically-substituted 2,5-diarylpyrroles from homopropargyl sulfonamides
作者:Wim Van Rossom、Yoshitaka Matsushita、Katsuhiko Ariga、Jonathan P. Hill
DOI:10.1039/c3ra46579a
日期:——
Unsymmetrically-substituted 2,5-diarylpyrroles were prepared by 5-endo-dig cyclization with consecutive deprotection of homopropargyl sulfonamides. Stepwise elaboration of an aldehyde allows the introduction of a variety of functional aryl moieties at the pyrrole ring.