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
Iron-Catalyzed Ring Expansion of Cyclobutanols for the Synthesis of 1-Pyrrolines by Using MsONH<sub>3</sub>OTf
作者:Daijiao Zhuang、Tharcisse Gatera、Zhenyu An、Rulong Yan
DOI:10.1021/acs.orglett.1c04304
日期:2022.1.21
The synthesis of 1-pyrrolinesfrom cyclobutanol derivatives and an aminating reagent (MsONH3OTf) has been developed. This one-pot procedure achieves C–N bond/C═N bond formation via ring expansion. A series of 1-pyrroline derivatives are synthesized in moderate to good yields under mild conditions.
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
Diastereoselective synthesis of cyclic 1,3-aminoalcohols bearing CF3(CCl3)-groups
作者:Nikolay E. Shevchenko、Gerd-Volker Röschenthaler、Alexander S. Mitiaev、Enno Lork、Valentine G. Nenajdenko
DOI:10.1016/j.jfluchem.2008.05.005
日期:2008.7
β-Hydroxymethyl substituted cyclic imines or imidates are formed as a result of the reaction. The reduction of the prepared imines leads stereoselectively to the cyclic 1,3-aminoalcohols. Application of methyl trifluoropyruvate in this transformation opens an opportunity for the synthesis of γ-aminoacids derivatives which contain pyrrolidine moiety.
Intramolecular Cyclization of Brominated Oxime Ether Promoted with Ytterbium(0) to the Synthesis of Cyclic Imines
作者:Yiqiong Wang、Fei Huang、Songlin Zhang
DOI:10.1002/ejoc.202000678
日期:2020.8.31
A general, efficient, and experimentally simple one‐pot new method for the synthesis of cyclic imines throughintramolecularcyclization of brominated oxime ether promoted by ytterbium(0) was reported for the first time. In this new strategy for the construction of cyclic imines, the N–O bond is used as a receptor of ytterbium reagent rather than as a source of N‐centred radical.