Synthesis of 2,2,5-Trisubstituted 2<i>H</i>-Pyrroles and 2,3,5-Trisubstituted 1<i>H</i>-Pyrroles by Ligand-Controlled Site-Selective Dearomative C2-Arylation and Direct C3-Arylation
作者:Miyuki Yamaguchi、Sakiko Fujiwara、Kei Manabe
DOI:10.1021/acs.orglett.9b02559
日期:2019.9.6
Palladium-catalyzed site-selectivedearomativeC2-arylation of 2,5-diaryl-1H-pyrroles with aryl chlorides was accomplished, and a series of 2,2,5-triaryl-2H-pyrroles were synthesized. In addition, the site selectivity of the reaction was switched by simply changing the ligand, and the direct C3-arylated 2,3,5-triaryl-1H-pyrroles were prepared. The obtained 2,2,5-triaryl-2H-pyrroles could be further
Accessing Polysubstituted NH Pyrroles from Nitroalkenes via [4+2]‐Cycloaddition/Reductive Ring Contraction Strategy
作者:Evgeny V. Pospelov、Alexander V. Zhirov、Baglan Kamidolla、Alexey Yu. Sukhorukov
DOI:10.1002/ejoc.202400627
日期:2024.8.12
of nitroalkenes with enol ethers followed by reductive ring contraction of the resulting cyclic nitronates provides a new access to polysubstituted NH pyrroles. Unlike conventional synthetic routes (Barton-Zard, Knorr, Hantzsch, Van Leusen pyrrole syntheses), this strategy affords NH pyrroles that do not necessarily contain a EWG group in the ring.