Achieving regio- and stereo-control in the fluorination of aziridines under acidic conditions
作者:Otome E. Okoromoba、Zhou Li、Nicole Robertson、Mark S. Mashuta、Uenifer R. Couto、Cláudio F. Tormena、Bo Xu、Gerald B. Hammond
DOI:10.1039/c6cc07855a
日期:——
We developed an efficient fluorination protocol that converts easily accessible aziridines into [small beta]-fluoroamines, which are important motifs in biologically active molecules. In contrast with traditional fluorination approaches, DMPU-HF has shown...
Domino Ring-Opening/Carboxamidation Reactions of <i>N</i>-Tosyl Aziridines and 2-Halophenols/Pyridinol: Efficient Synthesis of 1,4-Benzo- and Pyrido-oxazepinones
作者:Gagan Chouhan、Howard Alper
DOI:10.1021/ol902598d
日期:2010.1.1
A domino process is described for the synthesis of 1,4-benzo- and pyrido-oxazepinones by one-pot sequential ring-opening/carboxamidation reactions of various N-tosylaziridines with a range of 2-halophenols/pyridinol under phase-transfer catalysis.
Aziridination and unpredicted homologation reaction of N-sulfonylimines were achieved easily with a very simple, rapid and mild procedure through the use of diazomethane without the presence of any catalyst. The method represents an attractive alternative to metal-catalyzed processes.
Highly Regioselective Nickel-Catalyzed Cross-Coupling of <i>N</i>-Tosylaziridines and Alkylzinc Reagents
作者:Kim L. Jensen、Eric A. Standley、Timothy F. Jamison
DOI:10.1021/ja505823s
日期:2014.8.6
ligand-controlled, nickel-catalyzed cross-coupling of aliphatic N-tosylaziridines with aliphatic organozinc reagents. The reaction protocol displays complete regioselectivity for reaction at the less hindered C-N bond, and the products are furnished in good to excellent yield for a broad selection of substrates. Moreover, we have developed an air-stablenickel(II) chloride/ligand precatalyst that can be handled and
Multifaceted ion exchange resin-supported hydrogen fluoride: a path to flow hydrofluorination
作者:Zhichao Lu、Bhvandip S. Bajwa、Okoromoba E. Otome、Gerald B. Hammond、Bo Xu
DOI:10.1039/c8gc03166e
日期:——
solid anhydrous hydrogen fluoride equivalent was prepared by mixing HF gas with an inexpensive anion exchange resin (A26-HF, HF content 30% wt/wt). This reagent is capable of hydrofluorinating alkenes, of ring-opening aziridines to give fluoroamines, and of yielding fluorotetrahydropyrans through a fluoro-Prins reaction, all with high selectivity under mild conditions. Our ionexchange resin supported