A catalyticapproach to the titanocene-mediated radical cyclization of epoxy nitriles and epoxy carbonyl compounds to hydroxy ketones and diols is described. The reaction is sensitive to the substitution pattern of the catalyst and especially useful for the preparation of cyclobutanones. It can also be used for nitrile grouptransfer.
Platinum-Catalyzed Intramolecular Hydroamination of Unactivated Olefins with Secondary Alkylamines
作者:Christopher F. Bender、Ross A. Widenhoefer
DOI:10.1021/ja043278q
日期:2005.2.1
[PtCl2(H2C=CH2)]2 (2.5 mol %) and PPh3 in dioxane at 120 degrees C for 16 h led to isolation of 1-benzyl-2-methyl-4,4-diphenylpyrrolidine in 75% yield. A number of gamma- and delta-amino olefins underwent intramolecularhydroamination to form the corresponding pyrrolidine derivatives in moderate to good yield. The reaction displayed excellent functional group compatibility and low moisture sensitivity.
A Cascade Approach to Cyclic Aminonitrones: Reaction Discovery, Mechanism, and Scope
作者:Rojita Sharma、Paul G. Bulger、Michael McNevin、Peter G. Dormer、Richard G. Ball、Eric Streckfuss、James F. Cuff、Jingjun Yin、Cheng-yi Chen
DOI:10.1021/ol9010147
日期:2009.8.6
Treatment of omega-epoxynitriles with hydroxylamine affords cyclic aminonitrones in a single step and with high stereoselectivity. The scope of this novel transformation was explored in a series of examples. The aminonitrone products were shown to be useful substrates for further selective elaboration.