α,α-Alkylation-Halogenation and Dihalogenation of Sulfoxonium Ylides. A Direct Preparation of Geminal Difunctionalized Ketones
作者:Rafael D. C. Gallo、Anees Ahmad、Gustavo Metzker、Antonio C. B. Burtoloso
DOI:10.1002/chem.201704609
日期:2017.12.1
A one‐pot alkylation–halogenation of ketosulfoxonium ylides in the presence of alkyl halides is described. The method furnishes several gem‐difunctionalized haloketones (an alkyl and F, Cl, Br, or I) in good yields. Replacing alkyl halides with a mixture of electrophilic halogen species and various halide anions led to gem‐dihalogenated ketones containing a combination of the same or two different
Efficient α-Iodination of Carbonyl Compounds Under Solvent-Free Conditions Using Microwave Irradiation
作者:Jong Chan Lee、Yong Hun Bae
DOI:10.1055/s-2003-37523
日期:——
Direct conversion of carbonylcompounds into α-io- docarbonyl compounds has been successfully achieved under solvent-free microwave irradiation conditions using N-iodosuccin- imide and p-toluenesulfonic acid. developing a new direct method for α-iodination of ke- tones promoted by microwave irradiation under solvent- free reaction conditions. Therefore, we report herein a convenient method for the
A variety of olefins have been shown to undergo conversion to the corresponding alpha-bromo/iodoketones when reacted with NBS/NIS and IBX in DMSO at room temperature. While the reaction is found to occur rapidly with e-rich arylolefins leading to the corresponding haloketones in 65-95% yields in 0.3-3.0 h, those containing e-withdrawing groups are found to yield diketones concomitantly, such that the latter are the exclusive products over extended duration of the reactions. (C) 2009 Elsevier Ltd. All rights reserved.
Efficient Method for α-Iodination of Ketones
作者:Jong Chan Lee、Yong Suk Jin
DOI:10.1080/00397919908086443
日期:1999.8
alpha-Iodoketones are prepared in high yields from the initial reaction of various ketones with HNIB in CH3CN and subsequent treatment of potassium iodide or samarium(II) iodide.