Palladium-Catalyzed Asymmetric Intramolecular Dearomative Heck Reaction of Pyrrole Derivatives
作者:Ping Yang、Shu-Li You
DOI:10.1021/acs.orglett.8b03425
日期:2018.12.7
The Pd-catalyzed asymmetric intramolecular dearomatization of pyrroles via the Heck reaction in the presence of commercially available Pd(OAc)2 and the Feringa ligand is described. Diverse pyrroline derivatives were obtained in excellent yields (up to 99%) with high enantioselectivity (up to 96% ee). The reaction features a wide substrate scope, relatively mild conditions, and useful transformations
Aerobic Synthesis of Pyrroles and Dihydropyrroles from Imines: Palladium(II)-Catalyzed Intramolecular CH Dehydrogenative Cyclization
作者:Zhuangzhi Shi、Mamta Suri、Frank Glorius
DOI:10.1002/anie.201300477
日期:2013.4.26
sp3ectacularly mild! An efficient PdII‐catalyzed intramoleculardehydrogenativecyclization of imines affords (dihydro)pyrrole products using molecular oxygen as the sole oxidant. This mild formal sp3‐CH functionalization allows rapid and atom‐economical assembly of (dihydro)pyrrole rings from inexpensive and readily available allylamines and ketones. A broad range of functional groups are tolerated
Various pyrrole derivatives are synthesized from γ,δ-unsaturated ketone O-pentafluorobenzoyloximes by treatment with catalytic amounts of Pd(PPh3)4 and triethylamine via alkylideneaminopalladium(II...
Synthesis of Pyridine and Isoquinoline Derivatives by the Palladium-Catalyzed Cyclization of Olefinic Ketone<i>O</i>-Pentafluorobenzoyloximes
作者:Hironori Tsutsui、Koichi Narasaka
DOI:10.1246/cl.2001.526
日期:2001.6
Pyridines and isoquinolines are synthesized from olefinic ketone O-pentafluorobenzoyloximes by treatment with a catalytic amount of Pd(PPh3)4 in the presence of (n-Bu)4NCl and triethylamine.
Treatment of 1,4-diketones with liquidammonia gives high yields of isolable 2-hydroxy-3,4-dihydro-2H-pyrrole intermediates. These intermediates, which do not appear to have been observed previously in the Paal-Knorrsynthesis with ammonia, have been fully characterized by i.r. and 1H and 13C n.m.r. spectroscopy; in most cases they decompose quantitatively into 1H-pyrroles on standing. The intermediate from
用液氨处理1,4-二酮可获得高产率的可分离的2-羟基-3,4-二氢-2 H-吡咯中间体。这些中间体,以前似乎没有在Paal-Knorr与氨的合成中观察到,已通过ir,1 H和13 C nmr光谱进行了全面表征。在大多数情况下,它们在站立时会定量分解为1 H-吡咯。来自己烷-2,4-二酮的中间体也可以使用浓氨水制备。