“One pot” regiospecific synthesis of polysubstituted pyrroles from benzylamines and ynones under metal free conditions
作者:Jinhai Shen、Guolin Cheng、Xiuling Cui
DOI:10.1039/c3cc43844a
日期:——
A convenient âone-potâ weak base-promoted synthesis of polysubstituted pyrroles has been developed from benzylamines and ynones. This transformation involves the Michael addition reaction and intramolecular condensation, which features high regioselectivity, high efficiency, environmental friendliness and metal free. A series of polysubstituted pyrroles were provided in up to 91% yield for 27 examples.
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
Synthesis of multisubstituted pyrroles by ligand-controlled site-selective arylation and their transformation into multiarylated pyrrolines and pyrrolidines
Multisubstituted pyrroles were prepared by Pd-catalyzed site-selective arylation of 2,5-disubstituted 1H-pyrroles with aryl chlorides, triflates, or nonaflates. Site-selectivity of the reaction was controlled using appropriate ligands, and 2,2,5-trisubstituted 2H-pyrroles were synthesized via dearomative C2-arylation. Moreover, 2,3,5-trisubstituted 1H-pyrroles were successfully fabricated by direct