Na-promoted aerobic oxidation of alcohols to ketones
摘要:
Aerobic oxidation of a number of diaryl and arylalkyl carbinols to ketones was promoted by Na in THF at room temperature with up to 99% yield. This new oxidation method is also selective with good efficiency for the oxidation of benzylic secondary alcohols but not for a primary alcohol or nonbenzylic secondary alcohols. Under nitrogen, a catalytic amount of Ni or transition metal halides such as COCl3, FeCl3, and NiCl3 in combination with Na was also found to conduct a dehydrogenation of a secondary alcohol to the corresponding ketone in high yield at room temperature. (C) 2009 Elsevier Ltd. All rights reserved.
Benzylation via Tandem Grignard reaction —iodotrimethylsilane (TMSI) mediated reduction
作者:Eric J. Stoner、Darlene A. Cothron、Mary K. Balmer、Brian A. Roden
DOI:10.1016/0040-4020(95)00659-v
日期:1995.10
initial formation of biarylmethanols via reaction of aryl Grignards with carbonyl compounds followed by a subsequent reduction with iodotrimethylsilane (TMSI). A number of improvements over existing literature procedures are reported as well as previously unobserved dimenzations. Studies reveal that as few as 3 equiv of TMSI will give complete reduction in most cases where either of the substituents are not
Palladium-catalyzedcarbonylative cross coupling reaction of organofluorosilanes with organic halides was achieved in the presence of fluoride ion and an atmospheric pressure of carbon monoxide. Alkenyl- or arylfluorosilanes effectively underwent this reaction with alkenyl or aryl iodides in moderate to good yields. Thus, highly functionalized ketones are readily available without protection of reactive