Palladium-catalyzed ortho-olefination of 2-arylpyrrolidines: A tool for increasing structural complexity in nitrogen heterocycles
作者:Pablo D. Legarda、Alfonso García-Rubia、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1016/j.tet.2018.05.076
日期:2018.7
of the (2-pyridyl)sulfonyl unit as directing functionality and readily removable N-protecting group has enabled an efficient and practical transformation of 2-arylpyrrolidine derivatives into more complex tricyclic frameworks via palladium-catalyzed ortho-olefination with electron deficient alkenes and subsequent cyclization upon N-deprotection under mild conditions. The key cross coupling step in the
Zinc‐Catalyzed Asymmetric Hydrosilylation of Cyclic Imines: Synthesis of Chiral 2‐Aryl‐Substituted Pyrrolidines as Pharmaceutical Building Blocks
作者:Izabela Węglarz、Karol Michalak、Jacek Mlynarski
DOI:10.1002/adsc.202001043
日期:2021.3.2
cyclic imines promoted by a chiral zinc complex is reported. In situ generated zinc‐ProPhenol complex with silane afforded pharmaceutically relevant enantioenriched 2‐aryl‐substituted pyrrolidines in high yields and with excellent enantioselectivities (up to 99% ee). The synthetic utility of presented methodology is demonstrated in an efficient synthesis of the corresponding chiral cyclic amines, being pharmaceutical
Certain hexahydro-pyrrolo-isoquinoline compounds are histamine H
3
receptor and serotonin transporter modulators useful in the treatment of histamine H
3
receptor- and serotonin-mediated diseases.
We herein report an efficient and systematic synthesis of 1-pyrrolines from cyclobutyl azides under thermal and neutral conditions. The reaction proceeded without any additional reagents, and nitrogen was generated as the sole by-product. Furthermore, the generated 1-pyrrolines could be continuously transformed into pyrroles, N-Boc-amines, and oxaziridines in an one-pot manner.
Highly Effective Asymmetric Hydrogenation of Cyclic <i>N</i>-Alkyl Imines with Chiral Cationic Ru-MsDPEN Catalysts
作者:Fei Chen、Ziyuan Ding、Jie Qin、Tianli Wang、Yanmei He、Qing-Hua Fan
DOI:10.1021/ol201679f
日期:2011.8.19
A range of cyclic N-alkyl imines were efficiently hydrogenated by using a chiralcationic Ru(η6-cymene)(MsDPEN)(BArF) complex (MsDPEN = N-(methanesulfonyl)-1,2-diphenylethylenediamine) in high yields and up to 98% ee. A one-pot synthesis of chiral 2-phenylpyrrolidine via reductive amination was also developed.